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My a/c clutch is not engaging and there for the cooling fan is is not working what could be the cause

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  • Cars & Trucks Master
  • 5,316 Answers

There are two relevant relays. One is the AC relay, turns the compressor on. The other is the AC fan relay that turns the fan on. Find the AC relay in the underhood fuse/relay block. You could pull it out and with key on, check if one terminal for the relay has power as it should. If it does, swap these two relays, then see if compressor comes on. If it still doesn't work, the dash controls will need diagnosing. There may be a fuse for it, so check for that, a blown fuse.
If it was working and just quit, it is probably a job for a shop.

Posted on Jul 26, 2013

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Posted on Jan 02, 2017

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justuscc
  • 360 Answers

SOURCE: Loud Cooling Fan

that fan is very loud on that truck. if its not makin noise its not cooling. common on gm trucks

Posted on Sep 29, 2008

johnthejag
  • 286 Answers

SOURCE: replacing cooling fan clutch????

Hi

Yes you need to replace what is called the Fan Viscous Coupling Unit.

Then swap over the fan blades.

Quite straightforward.

Good luck !

John.

Posted on Jan 19, 2009

  • 21 Answers

SOURCE: a/c stopped working,the clutch still engages, fan blows warm, found no fluid leaks

the air blend door inside the heating / cooling unit that sits under the dash is probably not moving. there is an electric motor and control unit that moves the air blend door (assuming you have the electric dial or push button digital controls. some of these vehicles have a valve that shuts off the antifreeze from cycling through the heater and if it remains open then you would get "not hot" but just warm air.

Posted on Apr 26, 2009

jjjhandyman
  • 145 Answers

SOURCE: 1995 honda accord ex auxiliary cooling fan not engaging

The accy fan you are refurring to is actually the a/c consensor fan.The only time that fan operates is with the cycling of the a/c system.Verify by turning a/c on ,fan should come on & off with a/c cycles..

Posted on Oct 17, 2009

steve_e_uk
  • 1675 Answers

SOURCE: Replaced '03 GMC Envoy fan

The temperature switch triggers the electric clutch fan and is normally located on top of the thermostat housing. It has 2 or 3 prongs and the plug from the clutch fan connects to it, you can find it by locating the wire from the clutch fan and following it to the motor. Its a common failure point it is however not adjustable, but you might be able to get one that does not switch on when the temperature gets to a certain heat, maybe a hotter one or colder one, the best bet would be to ask main dealer if they do this type, or your one could just be faulty and need replacing hope this helps

Posted on Sep 13, 2010

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1 Answer

Compressor Clutch disengages and Radiator Fan starts to run loudly


The radiator fan should turn on when the a/c clutch engages as this is designed to increase the cooling of the engine as the a/c increases the engine loading. But the compressor clutch should stay engaged as long as there is need for cooling, and disengage/re-engage as the temperature control calls for cool air. The radiator fan will shut off IF the engine temperature is cool enough to do so, as it is regulated by heat, as well as the A/c override.

If your air conditioning is not cooling the car and the clutch is simply disengaging prematurely, have the temperature control and relay checked for proper operation. Also have the refrigerant level checked to assure there is adequate refrigerant in the system and no leaks. My first bet would be the relay or the thermostatic temperature control under the dash.

Jun 14, 2014 | 2006 Chrysler Crossfire

1 Answer

Radiator fan always engaged when AC is on


Radiator fan is supposed to blow anytime the A/C is on. Thats how you check to see if a fan is working, cause its supposed to blow anytime the A/C is on , but not neccesarily anytime the engine is running.

Mar 08, 2013 | GMC Envoy Cars & Trucks

1 Answer

Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

2 Answers

Motor fan is extremely loud!!


It is likely your fan clutch has gone bad and needs to be replaced.
Fan clutches are engineered to improve the vehicle’s cooling system efficiency. The clutch engages the fan at low speeds when additional cooling is needed. At high speeds the clutch disengages the fan, removing the load against the engine and allowing the engine to run more efficiently.
There are two types of fan clutches, non-thermal and thermal. Non-thermal fan clutches engage the fan based on the shaft speed of the water pump. Thermal fan clutches engage the fan based on a bi-metal thermostatic coil, which senses the under hood temperature.

It will look like this...


2012202.jpg 3e7a417.jpg

Apr 02, 2010 | 1995 Lincoln Town Car

2 Answers

While running the air conditioning, the air cools and then warms and eventually cools for a little bit again. I think the water pump is what's needed here? what is the big bolt behind the fan?


It is unlikely that the water pump is causing the trouble you describe. The large hex behind the fan is what you would turn to remove the fan clutch from the water pump shaft. This fan clutch is supposed to detect heated air coming through the AC condenser and radiator and engage the fan more positively with the water pump shaft when more air needs to me moved to cool the radiator and AC condenser. The fan clutch could be bad or the AC system may not be properly charged--either of these conditions could cause the problem you describe.

Feb 25, 2010 | 2005 Dodge Ram 1500

1 Answer

1995 honda accord ex auxiliary cooling fan not engaging


The accy fan you are refurring to is actually the a/c consensor fan.The only time that fan operates is with the cycling of the a/c system.Verify by turning a/c on ,fan should come on & off with a/c cycles..

Oct 17, 2009 | 1995 Honda Accord

2 Answers

TRUCK RUNNING TO COOL


You can purchase a "Hotter" Thermostat for your Truck. Go to any Decent Auto Parts Store and let them know your Problem, They should be able to help Further with this Issue.

Jan 02, 2009 | 1992 Chevrolet K1500

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