Question about 2003 GMC Envoy

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Replaced '03 GMC Envoy fan clutch BUT still have problem. Last year I asked my service shop to replace the (electric version) fan clutch to eliminate its activating at inappropriate times (cool weather, cold engine start up, in my garage on 1st crank of the day, etc) . They did but I continue to have the same problem with the fan clutch kicking in at inappropriate times causing significant power drain from the engine. I bought this SUV new from the dealership and use it only for commuting to work. For the 1st 4 years / 100,000 miles the fan clutch only engaged under high temp Texas summertime conditions ex: after I stopped to visit a mall or office and was re-starting a very hot engine. What event or which system signals this electric fan clutch to engage and is it adjustable?

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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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I replaced the clutch fan on my gmc 2003 envoy. But I still have the same problem, the noise is so loud, is there a computer that controls the fan?


you mention you have a clutch fan then you don't have any electrical control on the fan.
remove the belt to see if it 's the problem could be water pump bearing or else
hope it helps

Sep 29, 2014 | 2003 GMC Envoy

3 Answers

How much should I expect to pay to have the fan clutch and thermostat replaced in my 2004 Envoy?


The parts prices are $36 thermostat and depending on fan clutch model $88 - $260 From autoparts warehouse site
which leaves $580 for draining system and replacing parts and refilling system plus time a bit steep
get another quote from a different mechanic and decide

Apr 18, 2017 | 2004 GMC Envoy

2 Answers

2002 gmc envoy is over heating have changed the thermostate and the put new radiator but its still over heating any suggestions


Have the FAN CLUTCH checked. they are a common failure. Get a AC DELCO or the part from the dealer. Why was the radiator replaced? Heater work OK? A/C works OK?

Sep 22, 2011 | 2002 GMC Envoy

1 Answer

03 gmc envoy radio and dash lights go off for no reason


I WOULD ASK YOU TO CALL THE DEALER FIRST AND ASK IF THERE ARE ANY RECALLS OR SERVICE UPDATES FOR YOUR YEAR,MAKE MODEL.IF SO,THEY WILL FIX FOR FREE.YOU HAVE A SHORT SOMEWHERE.CHECH YOUR FUSES.

Aug 11, 2011 | 2003 GMC Envoy

2 Answers

I'm on my way to a car lot today to test drive a 2003 GMC Envoy. What services should I ask if they have performed?


o ask if they have done regular service like oil change, air filter and when the last time the coolant been changed, but also have the fan clutch and water pump checked for play they are big pay items and you want to make sure that if they do have play that are replaced and not at your dime .... I hope this helps good luck

May 28, 2011 | 2003 GMC Envoy

1 Answer

02 envoy, 6 cyl, loud wooshing noise when engine is cold. fan clutch seems fully engaged. goes away when engine warms up. is this normal or does fan clutch need replaced


Fan clutches for Envoys and Trailblazer are a problem, they go out all the time.

However, it is normal for it to do this when cold, but will only stay engaged for maybe 15 seconds AFTER you've put it in gear and have started to drive. After this, it will disengage and allow the engine to warm up faster.

If you haven't already replaced the fan clutch once, you're lucky. 2002 is especially bad for the clutches, but all years don't last long. Mine lasted 90k which is pretty long.

Feb 26, 2011 | 2002 GMC Envoy

1 Answer

I replaced the fan clutch and it was fine for like 3 munths now the light is on again im thinking its the ecu its a 03 gmc evoy inline 6. thanks the code is p1481 thanks


There a lot of aftermarket fan clutches out there that just don't hold up. Purchase either a GM part or a Dorman replacement.

Sep 13, 2010 | 2003 GMC Envoy

1 Answer

1 have 03 envoy,6cyl,have replaced viscouis fan,fan still runs a lot, dealer has checked twice all ok


Do you have the check engine light on? If a fault code of P1481 or P1484 is coming up with a scanner, the fan clutch is bad.

Aug 22, 2010 | 2003 GMC Envoy

1 Answer

Engine Light on. Dealership says fan clutch is Slipping


Work for GM dealership.The fan can be replaced anytime and a pcm reflash can also be done anytime.If the service engine soon lamp is on because of cooling fan code it is broke!!!!! As far as the price sounds about right

Jan 28, 2009 | 2002 GMC Envoy

2 Answers

Envoy 2002


You need to find a shop with a Tech 2 scanner. The pcm has to be recalibrated because when the fan clutch goes bad it back feeds into the computer and stores a hard code. And because the 02 is the first year for this style envoy its a pos! And these A**Holes from GM thought it was a good idea to have a electronic throttle body and gas peddle.

So in a nutshell it needs to have a PCM.AZ UPDATE AND YOUR DONE! SELL IT AND BUY SOMETHING YOU CAN FIX IN YOUR BACKYARD ON THE WEEKEND!

Aug 27, 2008 | 2002 GMC Envoy

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