Question about 2004 GMC Envoy

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I unplugged my fan blade clutch on my 2004 Envoy because when turning on the heat or a/c truck would shut off. Now that fall is approaching, i need to get to the root of the problem. Is it the Fan Blade Clutch or something else? Thermostat? Coolant Temp sensor? Please help!!

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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.
Keeping the fan clutch from working can lead to overheating conditions and it will set your check engine light.

Posted on Oct 23, 2010


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How old is the radiator? It may be clogged and not allowing coolant to flow thru,causing your overheating. You may also check the clutch on the fan. It is an aluminum round disk with fins molded into it and is located directly behind the fan blades.This clutch is heat sensitive and do fail overtime. When they fail, the fan does not turn at a proper revolution while the engine is runiing. These are just two areas that you may want to approach, and I am assuming the engine full with coolant.

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We have the same tapping sound on our 2003 Envoy six cylinder engine. I believe the sound is coming from the radiator fan clutch assembly. When the engine reaches its operating temperature and the fan clutch engages, the tapping sound goes away.

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Jun 03, 2009 | 2004 GMC Envoy

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