Question about 2003 GMC Envoy

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Engine cooling fan runs all of the time

2003 gmc envoy xl engine cooling fan running all of the time. check engine light came on I purchased a code reader and the code shows po495 engine cooling fan running too high

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  • cdough05 Mar 13, 2009

    thanks for trying did not fix my problem also purchased engine cooling fan clutch did not work either any info would be appreciated thanks.

  • Anonymous Mar 26, 2014

    cooling fans working all times even when vehicle is not on

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  • 6 Answers

The fan relay is bad

Posted on Mar 06, 2009

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1 Answer

2005 gmc envoy overheating when engine shut off


Sounds like your electric cooling fan is not turning on. Check the fuses and relays associated with the fan circuit.

Jun 14, 2016 | 2005 GMC Envoy Xl

1 Answer

After replacing the fan clutch and water pump do i have to reprogram the computer on a 2003 gmc envoy?


No! there is nothing to reprogram. The sensors in the coolant system and the temp sensor for the fans dont need to have anything done to them. If you are not getting any check engine light, you are good.

Feb 16, 2014 | 2003 GMC Envoy Xl

1 Answer

My GMC 2003 Envoy failed smog test because of "the


The person running the test is an idiot. The OBDII test instrument is not capable of determining if there is a warning lamp failure. It is probably guessing based on voltage level, but lamp resistance does normally vary. The test is supposed to be done visually. Take it to someone else, and they will probably be more competent and pass your car.

Mar 22, 2011 | 2003 GMC Envoy Xl

1 Answer

2003 GMC Envoy Service Engine light on. OBD2 Code is P0128


Ah the famous P0128.....It's 1 of 2 things. If your fan is not engaged constantly (would sound like an airplane or big rig everytime you step on the gas) and is working properly, that rules out the fan clutch. The other common problem is the thermostat. Replace the thermostat and the code will go away. Engine temperature needs to be at 210 degrees on these engines. If the fan clutch is constantly engaged, it's cooling the engine off constantly and won't get up to 210 fast enough. If it's the thermostat, it's stuck open and isn't allowing the coolant to properly heat up in time.

Feb 08, 2011 | 2003 GMC Envoy

1 Answer

How do you change the sensor for the check engine light that produces the Code 0128?


You'll find that this is actually your thermostat, not the actual sensor itself. Your thermostat is sticking open causing it to run too cool. Replace the thermostat, and that light will go out. I went a year with this problem, replaced the sensor twice, light would still go on. The bad thermostat was causing bad readings by the sensor. Very common problem for Envoys and Trailblazers.

Oct 26, 2010 | 2003 GMC Envoy Xl

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

I have 2003 gmc envoy my front ac control does not


Need to check to see if the blower motor is running.If it is,but not threw the vents,most likely a vent door actuator motor.The actuator motor in this case would be bad,it is hard to get to,unless you are mechanically inclined,You can do it your self.If the blower motor is bad,just replace it.Check fuses first,and the blower relay.If I can help,let me know.

Aug 29, 2009 | 2003 GMC Envoy Xl

2 Answers

I have a service engine soon light and the code that appeared when check is 1481, do you know what this means?


Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) #05-06-02-012B - (10/19/2006)

Models:2004-2006 Buick Rainier
2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT
2002-2006 GMC Envoy, Envoy XL, 

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.

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.

Replace the wire harness: 
Part Number 89024920 Description Harness Assembly, Engine Cooling Fan Wiring

Good luck and keep me posed. 

Aug 11, 2009 | 2003 GMC Envoy

1 Answer

2003 Envoy XL


It is in the front of the engine with the fan mounted to it. It is electronicly controled. If you change it be very careful the radiator is easy to damage. Good Luck

May 18, 2009 | 2003 GMC Envoy Xl

1 Answer

Idle drops when in park


You should check with a scanner to retrive the codes the PCM register,depending the code you can either send the vehicule to a mecanic or to a GM dealer for repair.Do not desconnect the battery anymore or you'll loose all the PCM codes and it will be difficult to find the exact problem.luck!

Nov 02, 2008 | 2003 GMC Envoy Xl

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