Question about 2004 GMC Envoy

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I changed my thermostat on my 4.2L engine now when i turn climate controls on the vehicle stalls any ideas where to start

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  • Jeff Turcotte
    Jeff Turcotte Oct 15, 2010

    will the blower run when the engine is off?

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  • GMC Master
  • 1,142 Answers

Easy one, when you changed the thermostat, you probably unhooked the battery, very common. Remove fuses 10 and 28 under the hood, then remove your throttle body and clean it with a sensor safe spray like seafoam. When done, put fuses back in and drive around a while with hvac all on off. The computer will relearn the newly cleaned throttle body. Your problem will go away.

Posted on May 09, 2017

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  • GMC Master
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The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean.

Posted on Oct 23, 2010

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The idle control is electronically controlled. If the idle speed is too high, its likely that the cold start unit which is fitted to the throttle body is defective and should be replaced....
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Try locating the heater hoses. Start with the vehicle cool and turn it on and wait till the engine temperature reaches the correct temperature. This should send fluid through the heater hoses. Feel the heater hoses for a change in temperature. If there is no change in heat after a while the problem is in your thermostat. If one heater hose is hot while the other is not than the problem is in the heater block. If both hoses are heating up then the problem is probably in the climate control knobs or wiring that controls the blend doors or may even be the blend doors are broke and are not opening correctly to allow heat into the vents. This could also be a problem if the ac does not get cool either.

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