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My 2004 gmc envoy check engine light soon and coolant overheating light comes on and when I lift the hood the coolant is literally boiling. Is this a thermostat issue?

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There may be numerous reasons for it.

1. Thermostat failing to open

2. Water pump that's malfunctioning

3. Clogged hoses and radiator core

4. Low coolant level

Posted on Jul 23, 2013

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Posted on Jan 02, 2017

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SOURCE: check engine light on - 2003 gmc envoy XL

That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.

Posted on May 18, 2008

  • 341 Answers

SOURCE: engine reset light on 2003 gmc envoy

The service engine light you refer to is telling you you have a problem with the computerrized engine control of the car.When the light comes the computer stores a numerical code that can be retrieved with a scan tool or code reader.If you are not experienced with diagnostics you need to take the car to a mechanic,because sometimes a code can fool you and you can change a good part.An example of this would be reading a code that the oxygen sensor is reading a lean condition setting the light on. but the real issue is a bad fuel pump not supplying enough fuel to the engine. On the code alone you would be inclined to change the sensor when it was not the problem.

Posted on Nov 26, 2008

  • 1 Answer

SOURCE: Coolant Temp Sensor

The sensor is located on the drivers side engine block...although you can see if from looking from the top of the engine, you would have to get under the vehicle and look up to replace it. Be aware that it takes a special tool to unscrew the old one and screw in the replacement.


Posted on May 11, 2009

c17hydro
  • 2984 Answers

SOURCE: GMC Envoy w/ code P0128

Start at $89 right off the bat just for diagnostics and then depending on what they find that is causing that fault, at LEAST one hour labor, plus parts....I would say $250 is a good ballpark figure....looking up your fault code now.

Posted on Aug 28, 2009

  • 2 Answers

SOURCE: check engine light....coolant temperature sensor

take altanator off and it is located right behind

Posted on May 25, 2010

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Coolant Temp Sensor


The sensor is located on the drivers side engine block...although you can see if from looking from the top of the engine, you would have to get under the vehicle and look up to replace it. Be aware that it takes a special tool to unscrew the old one and screw in the replacement.


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