Question about 2003 GMC Envoy

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Which coolant does a 2003 envoy need? - 2003 GMC Envoy

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The cooling system in your vehicle is filled with DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs first, if you add only DEX-COOL extended life coolant.

A 50/50 mixture of clean, drinkable water (if the water in your area is of poor quality, it is recommended you use distilled or de-ionized water) and DEX-COOL coolant will:

  • Give freezing protection down to -34°F (-37°C).
  • Give boiling protection up to 265°F (129°C).
  • Protect against rust and corrosion.
  • Help keep the proper engine temperature.
  • Let the warning lights and gauges work as they should.
Hope this information helps

Posted on Oct 16, 2010

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johnjohn2
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SOURCE: where is coolant temp sensor located on 2003 gmc

heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.

Posted on Jun 21, 2010

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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

What is the location of the coolant sensor on a 2004 gmc envoy


Hi there:
The Coolant Temperature Sensor location on 2000-2005 4.8L, 5.3L, 6.0L engines is in the head driver side, above the plug.



Additionally, this video also could help you...



Hope helps.

Mar 01, 2013 | 2003 GMC Envoy

1 Answer

I just change my termostate on my 03 envoy bu now it mark more than 210 meens geting over heating and consuming the coolant can eny body helpme to resolve this please


check and make sure you do not have leak and that your not loosing coolant it takes a few minutes for the new one to open just long enough for it warm up but you may just have air in your system common problem shut if off let it cool a bit take the radiator cap off if you hear air then you know got air in their and add coolant as you need envoys have a large cooling system so it takes more coolant than one would think.if i remember right they use the orange dex-cool type good luck to you

Aug 26, 2011 | 2003 GMC Envoy

1 Answer

We found that the coolant reservoir tank was leaking coolant from the rubber cork at the bottom of the tank. How can we fix this? My car is a 2003 GMC ENVOY 4.2L motor.


well dear its my pleasure to answer u but i suggest that u have to replace it with new onecoz its good for safety the things to replace on high ways the tank made high presure inside tank so no majic can stick it well

Jun 22, 2011 | 2003 GMC Envoy

1 Answer

Where is the coolant thermostat located in a 2003 gmc envoy?


The thermostat is behind the alternator and under the pcm on the drivers side of the engine.

Aug 04, 2010 | 2003 GMC Envoy

1 Answer

I am having problen with my 2003 GMC Envoy. The scanner show the following "code 128", what this mean.


This code indicates that the coolant has not reached operating temperature, this is usually caused by a stuck open thermostat.

Jun 29, 2010 | 2003 GMC Envoy

1 Answer

Where is coolant temp sensor located on 2003 gmc envoy v6? How do you replace it?


heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.

Jun 21, 2010 | 2003 GMC Envoy

1 Answer

The ac fan on my 2003 GMC Envoy stopped blowing. What could cause this problem.


A defective fan, relay, coolant temperature sensor, corrosion on wiring, defective ECU or wiring.

Apr 01, 2010 | 2003 GMC Envoy

1 Answer

Coolant level


I see, this is a sign of a good coolant system. there is no problem here. The system is fine. i do recommend flushing the radiator once a year but, your truck is in good condition.

May 24, 2009 | 2003 GMC Envoy

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