Question about 2004 GMC Envoy

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Hi I have a 2004 trailblazer with a 4200 vortec and I noticed that when I use the A/C the heat gauge runs about 210. The water pump seems to be ok

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210 degrees (thereabouts) is the normal operating temperature on this engine. A lower temperature indicates a stuck open thermostat and can cause poor gas mileage.

Posted on May 10, 2011

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Service engine light is on. Was told thermostat was bad on scanner. Car has 177,000 plus miles. Still has great heat.


If the thermostat opens too quickly or is stuck open, the computer will not see the proper rise in operating temperature and set the check engine light. Is your temperature gauge reading at 210 deg. or below that? If below 210 deg., change thermostat.

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i have a v_gear webcam and i cant get it 2 work it did not come wiv a cd can any 1 help if u can my email in initout_it_roundabout_it@hotmail.co.uk

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05 Trail Blazer Vortec 4200 center pulley seems to have a bad bearing behind it. Is that a pulley or idler problem or is it a water pump issue?


I have an 05 TB. I have replaced the idler pulley twice in the three years I owned it. Cheap and quick fix. Call your dealer and get the part. Problem is that the part comes with the whole bracket. Take the pulley of the new part and put it on the existing bracket already on your vehicle. 30 minute fix.

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