Question about 2004 GMC Envoy

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Check Engine Light on 2004 Envoy

Donny,

My check engine light goes on a off evey couple of days and I took it Auto Zone and code came up as a low coolent, bad coolent sensor, or bad thermostat. It seems that my thermostat may get stuck open. Could this damage my vehical? Should it be a immediate fix or could it wait until I have time? Any help would be greatly appreciated? Below you wrote:

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.

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  • jeanetteredd Feb 08, 2009

    check engine light came and won't go off. The codes came back for thermastat housing, and coolant senor. Can you tell me where they are located on a 2004 Envoy SLT with a 4.2 liter engine.

  • Anonymous Feb 08, 2009

    How can the thermostat be change without removing the power steering pump and/or the alternator?





  • Anonymous Feb 17, 2009

    My 2004 Engine Light came on and the dealership told me I need a new termastat. Is this true. They also said it would cost about $350.00.

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Yes this definatly can damage your vehicle, it can cause your head gaskets to blow, you engine to stop running, and some cases you will have no heat, replace the thermastate right away.

Posted on Nov 26, 2008

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