Question about 2004 GMC Envoy

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The ac works but the switch wont turn on the fan. the rear controls work. its just the front that doesnt. checked the relay switches they seem fine.

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  • 1,311 Answers

Either you have defective blower motor or a defective blower motor resistor module. The resistor module has been known to fail on these trucks. Both items are located behind the glove box.

Posted on Sep 11, 2010

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1 Answer

How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

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My fans aren't moving and all the wires are attacked, don't know what the problem is and my ac wont turn on


My opinion ...Fan relay switch....Ac will not run without fan working. A bad fan relay switch will cause this. Something to check..

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CHECK YOUR HEATER RELAY SWITCH AND YOUR FUSES

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Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

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1999 Alero: where is the a/c control tempature :problem is wh...


WELL TURN ON AC MAX COLD HIGH TO SEE IF COOLANT FANS TURN ON.IF NOT YOUR REFRIGERANT SO LOW THAT THE AC REFRIGERANT PRESSURE SENSOR WONT CLOSE CIRCUIT TO TURN ON COOLING FANS.MEANING YOU NEED HAVE AC CHECKED AND CHARGED.ALSO CHECK COMPRESSOR FOR POWER IF NOT YOU HAVE BLOWED FUSE OR BAD RELAY.IF FUSE AND RELAY GOOD YOUR AC COMPRESSOR CLUTCH COIL OPEN OR THE AC CONTROL SWITCH IS BAD.IF COMPRESSOR IS RUNNING WHEN YOU TURN ON AC YOUR AIR TEMPERATURE ACTUATOR NOT WORKING.

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2005 Dodge CaravFront defroster fan wont blow (rear is ok), fuses


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AC/heating fans don't work


The relay center is under the hood, there should be several with the same #'s switch one that you know is working in place of the fan relay, if fans turn on replace relay. It is faster to turn on ac after switching relays for diagnostics as fan should run as long as ac is on...

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1 Answer

2003 suburban with rear air, 27K mi, rear ac and heat are fine, but the front air diverter doesnt seem to work. I switch between defrost, face, and floor modes but no changes. I replaced the climate...


If it is a mechanical switch that you turn this system works by vacume it could be the vacume supply hose coming from the intake manifold is either off or broken.

You could also have disconnected it by mistake when you changed the climate control. Good luck

Sep 19, 2009 | 2003 Chevrolet Suburban 1500

2 Answers

Radiator fan not working


Hi. Check the bottom of the radiator or on the side, as you also have a temperature-sending switch. The switch must reach a certain temperature before sending a signal on to the fan relay.

The switch just screws into the radiator.

If you would like to contact me again about this or other problems, feel free to do so.
Bill
ASE Master Technician

Nov 26, 2008 | 1995 Honda Civic

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