ABS or Traction Control Warning Light On? Bad Wheel Speed Sensor (WSS)? Your problem could be the wiring harness.

ABS or Traction Control warning light on? Bad Wheel Speed Sensor (WSS)? In most cases the OEM harnesses are exposed to the elements and over time can rub against parts of the under carriage causing the wiring inside to fray or in some cases completely break. Other than a visual inspection of the wiring harness, a voltmeter in the ‘ohms’ setting would verify the integrity of the wire.

The following procedures verify good continuity in a circuit with a Digital Multi-Meter (DMM).
1. Set the function to the OHM (Ω) position.
2. Disconnect the harness connector of the suspect circuit.
3. Checking the circuit side going to the wheel speed sensor. This connector will have two pins, connect the DMM leads to these two pins.
4. If the DMM displays low resistance (most ABS sensors measure 1.28-1.92 K ohms) the circuit is good, and more diagnostic tests need to be done.

How does the ABS sensor or Wheel Speed Sensor work? As the wheel spins, the wheel speed sensor produces a AC signal. The EBCM (Electronic Brake Control Module) uses this AC signal to calculate wheel speed. Other points of interest for a faulty ABS sensor circuit would be to inspect the tone ring and plug connections.

TechSmart™ ABS Harness Repair Kit may be the best solution for a faulty harness.

2001-2005 Buick Century Sedan / Coupe
2005-2009 Buick Lacrosse
2002-2007 Buick Rendezvous
2006 Buick Terraza
2007 Cadillac CTS
2000-2005 Cadillac Deville
2004-2008 Cadillac SRX
2005-2009 Cadillac STS
2007 Cadillac XLR
2000-2005,2007-2009,2010 Chevrolet Impala
2000-2005 Chevrolet Monte Carlo
2004-2005 Chevrolet Venture
2006-2009 Chevrolet Light Truck Uplander
2007 Hummer H2
2004 Oldsmobile Silhouette
2001-2005 Pontiac Aztek
2004-2009 Pontiac Montana
2007 Saturn Relay

2001-2004 Buick Century Sedan / Coupe,
2005 Chevrolet Corvette,
2000-2006 Chevrolet Impala,
2000-2005 Chevrolet Monte Carlo,
2000-2002 Oldsmobile Intrigue,
2000-2005 Pontiac Grand Prix

What is a Electronic Throttle Body or commonly referred to as Throttle-By-Wire, Fly-By-Wire, Drive-By-Wire (DBW) or Throttle Actuator Control (TAC)?

Electronic Throttle Bodies? Where’s the throttle cable? As you may already know opening the hood in a modern car reveals systems alot different than that of years past. As engine life has been extended and engine controls have become more complex, longer-life and higher-reliability electronic components are required. These advances in electronic componets aid the Power Control Module (PCM) to stay within the programed perimeters for the best performance and emission regulations.  One of these components being the Electronic Throttle Control (ETC) system often referred to as throttle-by-wire, fly-by-wire, drive-by-wire (DBW) or throttle actuator control (TAC). Using a array of sensors the on-board computer system measures throttle demand, then sends out a signal (electronic command) to the electronic throttle body. This computer command is to operate a servo motor controlling the throttle plate/blade or butterfly.

What seems to be the failure of the Electronic Throttle Body is the plastic gear drive. A common problem of the throttle body bore has been a build up of gases from the EGR and PVC systems, combined with heat causes a formation of gummy residue. This gummy residue often restricts airflow causing poor or hunting idle and even stalling conditions. This residue can become so built up that it causes the throttle body plate/blade to stick, striping out the gear drive in the throttle body.

TechSmart™ has a complete line of New Electronic Throttle Bodies, offering a cost effective solution for repairing  failed electronic throttle bodies for many makes and models.

2010-2009 Ford Light Truck Expedition
2010-2009 Ford Light Truck F Series Fullsize Pickup
2010-2009 Lincoln Navigator

2007-2006 Cadillac CTS
2008-2006 Chevrolet Corvette
2009-2008 Pontiac G8
2006-2005 Pontiac GTO

2007-2006 Buick Rendezvous
2006-2005 Buick Terraza
2006-2005 Chevrolet Malibu / Malibu Maxx
2006-2005 Chevrolet Light Truck Equinox
2006-2005 Chevrolet Light Truck Uplander
2006-2005 Pontiac G6
2006-2005 Pontiac Montana
2006-2005 Saturn Relay

2008-2006 Buick LaCrosse
2006 Buick Rendezvous
2007-2006 Cadillac CTS
2006 Cadillac SRX
2007-2006 Cadillac STS

2006-2004 Cadillac SRX
2009-2006 Cadillac XLR
2006-2005 Pontiac Torrent

2004 Buick Rainier,
2006-2003 Cadillac Escalade,
2006-2003 Chevrolet Light Truck Fullsize Pickup
2007-2004 Chevrolet Light Truck G Series Fullsize Van / Express
2006-2003 Chevrolet Light Truck Suburban / Fullsize Blazer / Tahoe
2004-2003 Chevrolet Light Truck Trailblazer
2004-2003 GMC Light Truck Envoy,
2006-2003 GMC Light Truck Fullsize Pickup
2007-2004 GMC Light Truck G Series Fullsize Van / Savana
2006-2003 GMC Light Truck Suburban / Fullsize Jimmy / Yukon
2007-2005 Hummer H2

2004-2003 Oldsmobile Bravada
2007 Chevrolet Light Truck Colorado
2007 GMC Light Truck Canyon
2007 Hummer H3
2007-2003 Buick Rainier
2007-2003 Chevrolet Light Truck Trailblazer
2007-2003 GMC Light Truck Envoy
07-05 Pontiac Grand Prix
2007-2005 Saab 9-7
2007-2006 Chevrolet Impala

2007 Saturn Aura
2009 Saturn Vue
2009,2010 Buick Lucerne
2009,2010 Chevrolet Impala
2009-2006 Chevrolet Light Truck Uplander
2009-2006 Pontiac Montana
2009-2006,2010 Chevrolet Malibu / Malibu Maxx
2009-2006,2010 Pontiac G6
2009-2007 Chevrolet Light Truck Equinox
2009-2007 Pontiac Torrent

2001-1999 Cadillac Catera
2004-2003 Cadillac CTS

2002 Chevrolet Light Truck Trailblazer
2002 GMC Light Truck Envoy
2002 Oldsmobile Bravada

2008-2005 Pontiac Grand Prix
2008-2006 Buick Lucerne
2009-2005 Buick LaCrosse

2007 Chevrolet Light Truck Colorado
2007 GMC Light Truck Canyon
2007-2004 Saturn Ion
2007-2005 Chevrolet Cobalt

2006-2003 Chevrolet Light Truck Suburban / Fullsize Blazer / Tahoe
2006-2003 GMC Light Truck Suburban / Fullsize Jimmy / Yukon
2007-2003 Chevrolet Light Truck Fullsize Pickup
2007-2003 GMC Light Truck Fullsize Pickup

2009-2008,2010 Chevrolet Light Truck HHR
2009-2008,2010 Chevrolet Malibu / Malibu Maxx
2010 Chevrolet Light Truck Equinox
2010 GMC Light Truck Terrain

2008-2007 Chevrolet Malibu / Malibu Maxx
2009-2007 Pontiac G5
2009-2007,2010 Chevrolet Cobalt
2009-2007,2010 Chevrolet Light Truck HHR

2009-2007 Saturn Outlook
2009-2007 Saturn Vue
2009-2007 Suzuki XL-7
2009-2007,2010 GMC Light Truck Acadia
2009-2008 Chevrolet Light Truck Equinox
2009-2008 Pontiac Torrent
2009-2008,2010 Buick Enclave
2010 Buick LaCrosse

2009-2007,2010 Cadillac SRX
2009-2008,2010 Cadillac CTS
2009-2008,2010 Cadillac STS
2010 Buick LaCrosse
2010 Chevrolet Camaro
2010 Chevrolet Light Truck Equinox
2010 GMC Light Truck Terrain

2009 Chevrolet Light Truck Avalanche
2009 Chevrolet Light Truck Suburban / Fullsize Blazer / Tahoe
2009 GMC Light Truck G Series Fullsize Van / Savana
2009 GMC Light Truck Suburban / Fullsize Jimmy / Yukon
2009 Hummer H2
2009-2010 Cadillac Escalade
2009-2010 Chevrolet Corvette
2009-2010 Chevrolet Light Truck Colorado
2009-2010 Chevrolet Light Truck Fullsize Pickup
2009-2010 Chevrolet Light Truck G Series Fullsize Van / Express
2009-2010 GMC Light Truck Canyon
2009-2010 GMC Light Truck Fullsize Pickup

2009-2010 Ford Crown Victoria
2009-2010 Ford Light Truck E Series Fullsize Van
2009-2010 Ford Mustang
2009-2010 Lincoln Town Car
2009-2010 Mercury Grand Marquis

2009-2010 Ford Light Truck E Series Fullsize Van
2009-2008 Ford Mustang

2008-2006 Ford Light Truck Explorer / Sport / Sport Trac
2008-2006 Mercury Mountaineer

2005-2004 Ford Light Truck Explorer / Sport / Sport Trac
2005-2004 Mercury Mountaineer

2006-2003 Chevrolet Light Truck G Series Fullsize Van / Express
2006-2003 GMC Light Truck G Series Fullsize Van / Savana

2007-2005 Ford Five Hundred,
2007-2005 Ford Light Truck Freestyle
2007-2005 Mercury Montego

2009-2006 Ford Fusion
2009-2006 Mercury Milan

2010 Ford Light Truck Transit Connect

2006 Lincoln Zephyr
2009-2006 Ford Fusion
2009-2006 Mercury Milan

2002-2001 Chevrolet Light Truck Fullsize Pickup
2002-2001 Chevrolet Light Truck G Series Fullsize Van / Express
2002-2001 GMC Light Truck Fullsize Pickup
2002-2001 GMC Light Truck G Series Fullsize Van / Savana
1999-1998 Chevrolet Light Truck P Series Van
1999-1998 GMCLight Truck P Series Van

2004-2000 Chevrolet Corvette
2005-2004 Cadillac CTS

2002 Cadillac Escalade
2002 Chevrolet Light Truck Avalanche
2002-2000 Chevrolet Light Truck Fullsize Pickup
2002-2000 GMC Light Truck Fullsize Pickup

2008-2005 Pontiac Vibe

2004 Pontiac Grand Prix

2002-1999 Chevrolet Camaro
2002-1999 Pontiac Firebird

2009-2005,2010 Ford Mustang

How To Diagnose, Repair, Remove & Replace A Front Intermediate Shaft Bearing Assembly aka Front Axle Disconnect Assembly On A Chevy Trailblazer, GMC Envoy, Olds Bravada, Buick Rainier, Or Saab 9-7x

Well here is another part that is very common to fail with a bunch of different names to confuse you and us:

1. Front Differential Axle Disconnect Assembly (Most Normal People Call It This)

2. Intermediate Shaft Bearing Assembly (GM Dealers Call It This)

3. Splined Disconnect or Gear Pods

In lamans terms, this part basically disconnects or disengages the front drive axle when the driver switches from 4WD to RWD or 2-Wheel Drive. Their are 2 different versions of front differentials on these vehicles, One is called S4WD (Selectable 4-Wheel Drive) & A4WD (Automatic 4-Wheel Drive). The S4WD differential contains both an actuator & the axle disconnect. For our article, we will call it the FRONT AXLE DISCONNECT ASSEMBLY for the S4wd models and INTERMEDIATE SHAFT BEARING ASSEMBLY for the A4wd models, more info as you read.

Parts Involved: Image 1 is the Front Axle Disconnect (2 Versions GM Part #:15884292 or 15884291), Image 2 is the Front Differential Actuator (GM Part #: 12471631) which engages the front axles. Purchase both parts together here


front differential axle actuator

Here is information about the 2 different front drive axle(s), courtesy of General Motors:

S4WD- Selectable Four Wheel Drive Axle Description & Operation:

The image below shows the actuator (top) and how it bolts to the disconnect assembly(bottom)

Exploded view of axle actuator and the axle disconnect

The front drive axle on the S4wd or Selectable 4-Wheel Drive differentials use a disconnect mounted right next to the passenger side CV axle and oil pan. Their is both an actuator that is used to engage the front axles when 4WD is enabled & a disconnect assembly that is used to disengage the front axles when switched back to 2WD or Rear Wheel Drive.

Explode view of transfer case and axle disconnect with 4wd actuator

In the exploded view above,  the yellow box is the components of the 4WD axle disconnect assembly and the green box is the axle actuator. These parts are sold separately and if you are replacing the disconnect assembly, you should also strongly consider replacing the actuator as it must be removed to install the new disconnect assembly. The red box is the front differential.

When the driver switches to 4-Wheel Drive, the TCCM(Transfer Case Control Module or 4WD computer) sends a signal to the electric actuator mounted on the disconnect and it energizes a plunger to extend out and push the clutch fork and clutch fork sleeve out to engage the drive axles. This engages 2 gears inside the differential and makes the front differential act very similar to a non locking rear differential or in other words a semi-floating axle used on RWD cars for years. This is done because a traditional ring & pinion gear set is used to transmit the driving force from the engine and transfer case to the front differential. This type of front differential allows for the turning of the front wheels so each wheel can spin at different speeds during a turn and still use the power generated from the engine. This prevents your tires from being dragged across the pavement during a turn and more importantly prevents the internal gears from being damaged. The front drive axles are also CV axles and allow for turning also and absorbs much of the turning force.

A4WD- Automatic Four Wheel Drive Axle Description & Operation:

This part of the article we will call the front axle disconnect, the proper GM name of Intermediate Shaft Bearing Housing Assembly as this system, the name actually makes sense. This is because the differential intermediate shaft slides through the Intermediate Shaft Bearing Housing and rides on bearings inside the assembly. In fact bearing failure inside the housing is one of the biggest causes of replacement. Once the bearings start to fail, they will make noise and these noises are a symptom of the housing needing replacement. The A4wd front differentials are similar but they do not have an electric actuator and they do not actually use the disconnect assembly to disengage the 4WD. This is also one way for you to determine which system you have. If you look under the vehicle where the inner passenger side CV axle connects to the front differential, you will see the axle disconnect assembly. If a black plastic unit is attached to it, then you have the S4wd (selectable) and if you do not have it, then you have the A4wd(automatic). The image below shows the electronic actuator and the intermediate bearing assembly outlined in red.

actual image of a front axle disconnect with axle actuator for S4wd

The A4WD models uses the same differential carrier assembly, however the Intermediate Axle Bearing Housing Assembly is slightly different. The clutch fork, clutch fork sleeve, and gears have been replaced with a single splined sleeve that connects the right side drive axle to the inner axle shaft directly. This allows the passenger side CV axle to be directly connected to the intermediate axle shaft inside the differential. If the transfer case is activated by the PCM, then the clutch assembly within the transfer case controls the amount of torque applied to the front differential.

Ok, So now we know what these parts are and how they work. Next is the symptoms associated with a failed or failing Front Axle Disconnect/Intermediate Shaft Bearing Housing Assembly


1. Their is usually NOT a trouble code set set when these fail so a check engine or 4wd light may not even illuminate on the dash

2. The vehicle fails to engage into 2WD, 4WD, or AWD

3. Noise – A rattle in the front end is noticeable at lower speeds and no external components of the suspension or steering have play or damage

4.  Excessive play in the axle shaft connection inside the axle disconnect.

Remove & Replace Instructions:

1. Raise & support the vehicle properly, remove the passenger front wheel, splash shield, & then remove the passenger front CV axle.

2. On S4WD models, remove the electric axle actuator from the axle disconnect assembly by removing the 2 bolts and electrical connector. This part is also very common to fail, If this part has not yet been replaced, then we strongly recommend replacing it now or at a minimum test it. If you think about it, the axle actuator has gone through just as many cycles as the disconnect and if the disconnect failed, well then the axle actuator is probably right behind it.We have seen it over and over in our shop, not this exact part but parts similar to this, Think about the labor you are already doing and if it were my vehicle I would be replacing the actuator at the same time. If you have A4WD, then you can skip this step as you do not have this actuator on your vehicle.

3. Remove the wire harness clip located on the axle disconnect.

4. Remove the 4 bolts attaching the axle disconnect from the front differential. The images below show both systems:

A4WD system showing 4 bolts to remove assembly

S4WD showing removal of actuator and disconnect assembly

4. Remove the old disconnect assembly

5. Remove the new part from the box and remove the protective plastic plugs inside of each seal.

6. The new units are pre-greased internally from the factory, however just like most any seal, it is a good idea to apply a small amount of lube along the lip of each seal with your finger. This prevents the seals form being damaged when the metals shafts slide through them during installation.

7. Install the new unit and make sure it is flush to the oil pan.

8. Tighten the 4 axle disconnect attaching bolts to the differential to 35 foot lbs.
9. On S4wd electric shift models, clean the actuator on the point where actuator meets the internal shift fork of the new disconnect unit. Install the actuator, Tighten the 2 bolts of the electric actuator to the axle disconnect to 53 Inch Pounds

10. Reinstall the remainder of the items in the reverse order.

IMPORTANT NOTES:  Do not nick or cut the inboard oil pan inner shaft seal!!     Also the axle disconnect must fit flush against the oil pan in order for the inner axle shaft to line properly!!

How To Replace Intake Manifold GM 3800 3.8L: Pontiac Bonneville, Buick LeSabre, Pontiac Grand Prix, Buick Park Avenue

The upper intake manifold is a very common failure point on the venerable GM 3800 Series II Engine. Often when it begins to fail, the car will show the symptoms of a head gasket failure, however actual head gaskets failing on this engine is VERY rare. One of the first signs of the intake manifold failure is coolant loss, these intakes can leak internally into the engine, or externally near the thermostat housing. In extreme cases, the leak can get so bad internally that it can actually Hydro-lock (when an engine fills with so much liquid that the pistons cannot move up in their bore). This was the case on the example car I will show you today.In the case shown below, the owner of the car thought the head gaskets were bad, and it would need major repair or a new engine. After a quick inspection I knew it was only the intake manifold that was bad. The car had stalled on him, and would not turn over at all, acting like the engine was seized.

Parts List for the GM 3800 Intake Manifold

NOW AVAILABLE: Video Instructions Part 1

GM 3.8L Intake Manifold Replacement Instructions Part 2

Part 3-Removal Of The Fuel Injectors & Fuel Rail

Part 4-Removal & Explanation Of The Internal Components Of The Upper Engine

Part 5-Removing The Lower Intake Manifold & Alternator

Part 6-GM 3.8L Lower Intake Manifold Removed- Explanation Of The Valve Train & Middle Of The Engine

Part 7-Finishing Up

Before I start, here are the exact vehicles affected by this leak:

1995-2005 Pontiac Bonnville 3.8L

1998-2005 Chevy Monte Carlo 3.8L

2000-2005 Chevy Impala 3.8L

1996-2005 Buick Lesabre 3.8L

1996-2004 Buick Regal 3.8L

1995-2005 Buick Park Avenue 3.8L

1995-1997 Buick Riviera 3.8L

1995-1998 Olds Regency 3.8L

1995-1999 Oldsmobile Delta 88 3.8L

1996-1999 Oldsmobile LSS 3.8L

All 3.8L (3800) engines with VIN code K (8th digit of VIN) Non-supercharged

Before you tear into it, there are two important steps,

1) DISCONNECT the negative battery terminal

2) Drain any engine coolant that may still be in the car (there is a small drain near the bottom of the radiator). After these two steps, you must gain access to the intake manifold by removing some things that are in your way.

3) Remove the engine cover by turning the oil cap to loosen, then without pulling it off, continue to twist it counterclockwise, when it stops completely, pull the oil cap AND oil cap tube away from the engine. You can then lift the engine cover off of the engine.
SORRY IMAGES HAVE BEEN LOST, View video Instructions

Remove the air filter housing. Loosen the two Philips screws on the housing itself, then pull the throttle body hose end off. (Peel back the top of the hose, then work around until the whole thing comes loose) Disconnect the plug going into the intake hose, and remove whole assembly from car.

4) If the spark plug wires aren’t marked, mark which one goes where on the coil pack, and pull the three plug wires that run to the rear off of the coil, and let them fall to the rear of the engine bay.

5) Remove serpentine belt.

6) Loosen the three alternator bolts and remove wiring from back of alternator. Remove alternator and set aside. NOTE: To remove one of the bolts, you must remove a bracket which runs from the Alternator to just below the Ignition coils.TIP: There is a bolt which is hard to see just below the belt idler pulley.

7) Remove the 6 Fuel Injector electrical plugs, (Squeeze in on the metal locks and pull up) Remove the three electrical connectors going to the throttle body. Remove the electrical connector going to the MAP sensor (sits on top of the intake manifold near the alternator)

8) Remove all vacuum lines going to the throttle body and intake manifold.

9) Remove the fuel lines from the fuel rail. You will see two plastic lines going the the fuel rail, they are both held in by small plastic clips. To remove them, squeeze in on the bottom of the clips, then pull up on the fuel line. **CAUTION** There may be some residual fuel pressure in one of the lines, so remove the lines very slowly and carefully.

10) Remove Fuel Rail with injectors. There are four nuts which keep the fuel rail, and injectors in place. Once you remove those four 10mm nuts, carefully wiggle and pull upwards on the fuel rail, and the injectors will unseat themselves from the lower intake manifold, and the whole fuel rail will come out. Set aside.

11) Remove Throttle Body. There is a bracket which connects the throttle body to the cylinder head, this little bracket blocks access to one of the throttle body nuts. My trick is to remove the Bracket-to-throttle body bolt, then carefully pry the bracket back until you have enough access to reach the nut with a deep 10mm socket and extension. You can leave the throttle cables attached to the throttle body, and just position the entire assembly aside.At this point, you should have clear access to the entire upper intake manifold.

12) Remove all of the upper intake manifold bolts, and remove the intake from the car. If the intake does not want to separate from the lower, then you most likely missed a bolt. it should NOT require any prying to get it loose.

13)Now if the intake was leaking internally badly, you will likely see an alarmingly large puddle of coolant sitting inside the engine. It is CRUCIAL that you remove all of this coolant, use Paper towels or old rags to soak it all up. Clean the gasket mating surface on the lower intake manifold.TIP: It is very important to have a clean mating surface on the top of the lower intake manifold, or you may encounter leaks.

14) Snap the upper intake gasket into place onto the bottom of the new upper intake manifold and place the upper intake back onto the car, make sure all the bolt holes are aligned.

15) Install and tighten all the bolts in the following sequence NOTE: The Specified Torque is ONLY 89 INCH pounds,, which is less than 10 ft. pounds.. be very careful not to over-torque and risk cracking the new intake.

16) Reinstall all accessories and wiring, and fuel rail in the reverse order of removal. Refill the coolant system.

17) IMPORTANT STEP: If you saw ANY coolant at all inside the intake manifold upon removal,, you MUST replace the spark plugs. Also it is very important that you remove most of the coolant that may have entered the combustion chambers. Which is simple to do

17a) Remove all six spark plugs, and turn the engine over (pretend you’re starting it) for at least 30 seconds. Install six new spark plugs and you are good to go.

18) Start car and let idle for a while, check for any coolant leaks, carefully watch your temperature gage to make sure no overheating takes place. Once everything looks good, you are done!Congratulations, you just saved yourself Hundreds of Dollars by Replacing your own Intake Manifold on a 3.8 Liter 3800 Series II Car!

Written by Joe S.

Fan Clutch, Chevy Trailblazer, Gmc Envoy, Ranier,Saab

GMC Envoy/ Chevy Trailblazer Electronic Fan Clutch

Removal & Installation Instructions

Also Fits: Olsmobile Bravada, Buick Ranier, Isuzu Ascender, & Sabb Vehicles

GM Part #: 15293048, 25790869, 15192191

Dorman 622-001 Electronic Fan Clutch

AKA: Cooling Fan Speed Sensor, Electro-Viscous (EV) Fan Clutch, Electronic Fan Clutch

Symptoms that may require fan clutch replacement:

Excessive Fan Noise and/or Check Engine Light On

Possible Diagnostic Trouble Codes Set:

P0495, P1481, P1482, P1484


Fan Clutch Wrench Part #: J-41240 or J-46406

 This can usually be purchased at most Auto Zone or Advance Auto Parts Stores. We can also supply you this wrench with your fan clutch order. Please email or call us and we can add it to you order or you can usually add it when going through checkout. Please call us with any questions 1-866-770-2771

CAUTION: It is not recommended to disconnect the battery on any later model vehicle unless specified in repair instructions. Disconnecting the battery can cause the vehicle computers to lose valuable memory data and can actually cause driveabillity problems. If you do disconnect the battery, a computer relearn procedure must be done to bring vehicle back to normal.


 Remove Cooling Fan & Shroud

  • Remove the hood latch support

  • Disconnect the transmission cooler lines at the engine and release the lines from the fan shroud. NOTE: Many customers have stated that the cooler lines do not need to actually be disconnected, removing them from the shroud is all that is normally needed to get clearance

  • Remove the 2 upper fan shroud bolts

  • Drain approximatly 1 Qt. of coolant

  • Reposition the upper inlet radiator hose clamp

  • Remove the upper inlet radiator hose from the radiator

  • Remove the electrical connector from the shroud

  • Position the water pump so the bolts are aligned in the vertical position

  • Use the fan clutch wrench to loosen and remove the fan clutch hub nut. NOTE: This is removed by turning it in a counter-clockwise rotation while facing the vehicle. NOTE: The fan clutch wrench has 2 tabs that lock into the water pump to allow you to hold it while using the other piece of the wrench to turn the nut.More tips are below in our customer’s installation tips.

  • Unclip the fan shroud from the radiator side panels.

  • Tilt the radiator and the condenser forward

  • Lift the fan and the shroud up and out towards the engine to release the fan from the radiator inlet.

  • With the entire assembly out, remove the bolts retaining the fan blade to the fan clutch

  • Seperate the blade from the clutch


  • Install the fan blade onto the clutch and install the 4 bolts. Torque these bolts to 20 Ft./Lbs.
  • Install the fan & shroud onto the lip of the radiator bottom.
  • Install the 2 bolts into the upper fan shroud and tighten to 21 Ft./Lbs.
  • Connect the electrical connector
  • Clip the fan shroud to the radiator at the side panels
  • Install the fan clutch onto the water pump shaft and tighten in a clockwise rotation with the fan clutch wrench. The torque on this nut is 41 Ft./Lbs
  • Tighten or re-install the transmission cooler lines and clip them back into the fan shroud
  • Install the hood latch
  • Install the upper radiator hose and reposition the hose clamp
  • Fill the cooling system
  • Check with the dealer for any PCM software updates. These are very important!!

NOTE: Some vehicles require the PCM to be updated for a software problem with the fan clutch. You are surely familair with your home computer needing updates periodically. This is actually also true for the computers installed on your vehicle. Your vehicle has several computers installed and it is not uncommon for the manufacturer to come out with updates. Many of these updates are free and many are charged for. The electronic fan clutches on these vehicles are very common to fail, however sometimes all that is needed is a software update. The software for the fan clutch has been upgraded and also should be done when a new fan clutch is installed. The early model trailblazers, envoy’s, ranier’s, bravada’s, and Saab’s could actually have improved air conditioning function and have a ticking noise fixed by having a software update performed. Please check with your dealer by calling them and giving them your VIN to see if any updates are available. They are well worth getting even if they cost you money.

VIEW this FAN CLUTCH on our website here…

Buick Park Avenue, Lesabre Front Wheel Hub Bearing Replacement

Here is a great set of instructions for the installation of a GM front wheel hub bearing assembly. One of our customers submitted this for us to show to the public. Hopefully anyone thinking about tackling this job will find these helpful. (continue reading…)

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