Question about 2002 GMC Envoy

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Cooling fan clutch

Can you help me how to install a cooling fan clutch?

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You need special tools to do this. a big wrench and a spanner withpins to hold the pulley.

Posted on Sep 20, 2008

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My 1999 ford RAnger has heat but the fan makes alot of noise and does not blow out the heat and the trucks gauge will go hot. What would the issue? Heater core or mayb just the fuse?


Diagnose Cooling Fan Clutch On engines with belt-driven cooling fans, a fan clutch is often used to save energy and reduce noise. The fan clutch disengages slows or disengages the engine's cooling fan when extra cooling isn't needed. The fan pulls air through the radiator and air conditioning condenser when the vehicle isn't moving fast enough to provide adequate airflow for cooling. A fan can eat up anywhere from a couple of horsepower up to 12 or 15 hp on a big V8, so by reducing the parasitic horsepower loss on the engine the fan clutch makes a noticeable difference in fuel economy

TWO TYPES OF FAN CLUTCHES basic types of fan clutches: thermal and non-thermal (also called "torque limiting Thermal fan clutches have a temperature-sensitive bimetal coil spring on the front that reacts to temperature changes. When the air coming through the radiator is hot, the spring expands and opens an internal valve that reduces clutch slippage. This causes the fan to spin faster for increased cooling. As the air cools, the spring contracts and closes the valve. This increases the amount of clutch slippage, allowing the fan to slow down and decrease cooling FAN CLUTCH OPERATION

The clutch consists of a fluid coupling filled with a silicone based oil. In the cutaway view at the left, the area between the teeth on the clutch plates is filled with silicone fluid. An internal valve opens and closes a passage between the main fluid cavity and a fluid reservoir. When the passage is open, fluid enters the clutch and makes the fan to turn faster. When the valve is shut, fluid flows back to the reservoir but doesn't return, causing the clutch to slip and the fan to turn more slowly.
The non-thermal (torque limiting) fan clutch doesn't have a temperature sensing capability. It reacts only to speed, slipping to limit maximum fan speed to about 1200 to 2200 rpm depending on the application.

FAN CLUTCH PROBLEMS

A slipping fan clutch is often overlooked as the cause of an engine overheating problem.
As a fan clutch ages, fluid deterioration gradually causes an increase in slippage (about 200 rpm per year). After a number of years of service, the clutch may slip so badly that the fan can't keep up with the cooling needs of the engine and the engine overheats. At this point, replacement is often necessary.
Other signs of fan cluch failure would include any looseness in the clutch (check for fan wobble), or oil streaks radiating outward from the clutch hub.
If the clutch is binding, the fan may not release causing excessive cooling and noise, especially at highway speeds

CHECKING THE FAN CLUTCH

A good clutch should offer a certain amount of resistance when spun by hand (engine off, of course!). But if the fan spins with little resistance (more than 1 to 1-1/2 turns), the fan clutch is slipping too much and needs to be replaced.
If the fan binds, does not turn or offers a lot of resistance, it has seized and also needs to be replaced.
Fan speed can also be checked with an optical tachometer, by marking one of the fan blades with chalk and using a timing light to observe speed changes, and/or listening for changes in fan noise as engine speed changes.
You should also try to wiggle the fan blades by hand. If there is any wobble in the fan, there is a bad bearing in the fan clutch, or a worn bearing on the water pump shaft. A bad water pump bearing will usually cause the water pump to leak and/or make noise, but not always. Remove the fan clutch and see if the play is in the water pump shaft. If it feels tight (no play or wobble), replace the fan clutch.

FAN CLUTCH REPLACEMENT

Many experts say it is a good idea to replace the fan clutch at the same time as the water pump if the water pump has failed. The reason is because both age at about the same rate, so if the water pump has failed, the fan clutch may also fail soon. As as we mentioned earlier, a high mileage fan clutch may be slipping excessively increasing the risk of overheating.
When you buy a replacement fan clutch, make sure you get the same type (thermal or nonthermal) as the original. You can always upgrade from a nonthermal to a more efficient thermal fan clutch, but never the reverse. Or, you can get rid of the fan and clutch altogether and install an aftermarket electric fan kit to cool the radiator.

Sep 28, 2016 | Ford Cars & Trucks

1 Answer

Upon starting my truck I hear the sound of rushing air for about 30 seconds then ok; why?


I would say more than likely it the radiator cooling fan. For some reason some vehicles, no matter what temperature, the cooling fan clutch engages which makes the cooling fan run at full speed like there's no fan clutch.

It sort of makes it sound like the engine is revving up but it's simply the sound of the rushing air from the fan clutch making the cooling fan spin at full speed.

Hope this helps.

Feb 21, 2015 | 2001 GMC Sonoma Extended Cab

1 Answer

What dose this code number mean po495


Hi there:
DTC P0495 - Cooling Fan Speed High



Engine running; system voltage more than 8.50v, IAT signal more than 19?F, Cooling Fan command more than 0%, and the PCM detected the Cooling Fan speed was more than 1,600 rpm, condition met for 81 seconds.


The Cooling Fan relay sends a Pulse Width Modulation (PWM) signal (12-14v) to the cooling fan via the cooling fan clutch supply voltage circuit. The PCM uses the PWM signal, which controls the speed of the cooling fan clutch by controlling the position of the oil control valve inside the clutch. If the cooling fan clutch speed is too high when the PCM is commanding 0%, DTC P0495 is set.



Some cases was solve when thermostat is replaced. In THIS LINK coiuld finf other description and details.


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Aug 21, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

I am getting a P1481 code, From what I see it could be the Fan Clutch, but would it also cause it to shift at a higher RPMs, It only does it some time.


OK, loss of cooling fan speed. I will say this is plausible. I'll take your word for it (sometimes my online resource is not complete).

prev.gif next.gif Cooling Fan & Shroud Removal & Installation To Remove:
  1. Drain the coolant from the engine.
  2. Remove the air cleaner assembly from the engine compartment.
  3. Remove the air resonator assembly from the engine.
  4. Remove the inlet radiator hose from the radiator.
  5. Detach the transmission oil cooler lines from the fan shroud.
  6. Disconnect the fan clutch connector. Fan clutch removal and installation gm-03-00-1477.gif

  7. Use a J 46406 fan clutch remover and installer to remove the fan clutch from the water pump.
  8. Remove the upper mounting bolts from the fan shroud.
  9. Remove the fan shroud from the radiator by lifting the shroud and pushing inward.
To Install:
  1. Attach shroud to the radiator. Torque the bolts to 21 ft-lb (28 Nm).
  2. Use a J 46406 fan clutch remover and installer to install the fan clutch onto the water pump.
  3. Connect the fan clutch connector.
  4. Attach the transmission oil cooler lines to the fan shroud.
  5. Install the inlet radiator hose to the radiator.
  6. Install the air resonator assembly onto the engine.
  7. Install the air cleaner assembly into the engine compartment.
  8. Refill the engine with coolant.
prev.gif next.gif

Jul 22, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

I replace the fan clutch and i still have the code p1481 what does that mean? 2002 chevrolet Trailblazer 4.2 Thanks You! Arthur Tyler


TSB#05-06-02-012B: Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) - (Oct 19, 2006)
Subject:
Service Engine Soon (SES) or Check Engine Light On,
DTC P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness)
Condition
Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.

Cause
This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This
contact may damage the insulation of the wires enclosed in that harness.

Correction
Replace the engine cooling fan harness using the procedure listed below.

1. Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.

2. Place the cooling fan assembly on a bench.
Disconnect the harness electrical connector from the cooling fan clutch.

3. Remove the harness from the plastic guide while feeding the wires out of the slot.

4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.

5. Feed the wires into the slot and install the harness to the plastic guide.

6. Connect the harness electrical connector to the cooling fan clutch.

7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.

Part Number 89024920

Description
Harness Assembly, Engine Cooling Fan Wiring
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Apr 29, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

How to change water pump (1997 sonoma)


The text below is from the GM Service manual 4.3L V6 Engine
Water Pump Replacement (4.3L)
Removal Procedure
Drain the cooling system. Refer to Draining and Filling Cooling System .
Loosen the water pump pulley bolts.
Remove the cooling fan and clutch assembly.

Tools Required
J 46406 Fan Clutch Wrench

Removal Procedure
Remove the upper fan shroud.
Remove the fan clutch from the water pump in a counterclockwise direction using the J 46406 .
Remove the fan clutch assembly.
Remove the drive belt. Refer to Drive Belt Replacement Remove the water pump pulley mounting bolts.
Remove the water pump pulley.
Remove the radiator outlet hose clamp from the water pump.
Remove radiator outlet hose from the water pump.
Remove the water pump mounting bolts.
Remove the water pump from the engine.
Remove the water pump gaskets.
Clean the water pump gasket mating surfaces.
Installation Procedure
Install the water pump gaskets.
Install the water pump to the engine.
Apply a sealer (GM P/N 12346004) to the bolt threads.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the water pump mounting bolts.
Tighten
Tighten the mounting bolts to 41 N·m (30 lb ft).
Install the radiator outlet hose to the water pump.
Install the water pump pulley.
Install the water pump pulley bolts.
Tighten
Tighten the water pump pulley bolts to 25 N·m (18 lb ft).
Install the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 4.3L.
Install the fan clutch assembly.
Fill the radiator cooling system. Refer to Draining and Filling Cooling System .
Inspect the cooling system for leaks.

Oct 01, 2009 | 1997 GMC Sonoma

1 Answer

How to take off the cooling fan from 1997 gmc safari


  1. Disconnect the negative battery cable for safety.
  2. Place a catch pan under the radiator, open the drain **** and drain the cooling system.
  3. Loosen the clamp, then remove the air cleaner assembly.
  4. Remove the upper fan shroud retaining bolts, then remove the upper shroud from the vehicle.
  5. Remove the fan and clutch assembly retainers using J-41240, or an equivalent fan clutch wrench.
  6. If necessary, remove the 4 bolts holding the fan blade to the clutch, then separate the fan from the clutch assembly.

    Installation is the reverse of the removal procedure. Tighten the components to the following specifications:
you will need a special tool to remove #3 fan clutch.

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the tool is sold in pep boys auto zone and many auto parts.

Sep 09, 2009 | 1997 GMC Safari

2 Answers

Code 1481


SOMETIMES THE WIRING HARNESS GET DAMAGED WHEN FAN REMOVED. GM HAS BULLETIN TO REPLACE COOLING FAN WIRING HARNESS PART# 89024920
Harness Assembly, Engine Cooling Fan Wiring
  1. Place the cooling fan assembly on a bench.
  2. Disconnect the harness electrical connector from the cooling fan clutch.
  3. Remove the harness from the plastic guide while feeding the wires out of the slot.
  4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.
  5. Feed the wires into the slot and install the harness to the plastic guide.
  6. Connect the harness electrical connector to the cooling fan clutch.
  7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.

Nov 25, 2008 | 2003 Chevrolet TrailBlazer

2 Answers

Change water pump


If you have any questions feel free to ask. Let me know if you dont get diagrams(happens sometimes)

0900c1528004319d.jpgReverse rotation water pump—2.5L and 4.0L engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this manual.
  2. Drain the cooling system.
  3. Remove or disconnect the following: NOTESome 4.0L engines are equipped with a fan clutch that threads Directly on to the water pump shaft. This fan clutch is equipped with right-hand threads. NOTEDo not store the fan clutch assembly horizontally, silicone may leak into the bearing grease and cause contamination. NOTEOne of the water pump bolts is longer than the others. Note the location for reassembly.
    • Negative battery cable
    • Electric cooling fan connector
    • Accessory drive belt
    • Engine cooling fan and pulley
    • Water pump pulley
    • Power steering pump
    • Lower radiator hose from the water pump
    • Heater hose
    • Water pump and discard the gasket
To install:
  1. Clean the mating surfaces of all gasket material.
  2. Install or connect the following:
    • Water pump using a new gasket. Torque the bolts to 17 ft. lbs. (23 Nm).
    • Heater hose
    • Lower radiator hose
    • Water pump pulley. Torque the bolts to 20 ft. lbs. (27 Nm).
    • Power steering pump
    • Engine cooling fan and shroud. Torque the bolts to 31 inch lbs. (3 Nm).
    • Accessory drive belt
    • Electric cooling fan connector
    • Negative battery cable
  3. Fill and bleed the cooling system.
  4. Start the engine, check for leaks and repair if necessary.
3.7L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this manual.
  2. Drain the cooling system.
  3. Remove or disconnect the following:
    • Negative battery cable
    • Fan and clutch assembly from the pump
    • Fan shroud and fan assembly. If you’re reusing the fan clutch, keep it upright to avoid silicone fluid loss!
    • Lower hose
    • Water pump (8 bolts)
  4. Installation is the reverse of removal. Tighten the bolts, in sequence, to 40 ft. lbs. (54 Nm). 0900c1528004319e.jpgWater pump tightening sequence—3.7L

Nov 15, 2008 | 2002 Jeep Grand Cherokee

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