Question about 2004 GMC Sierra
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Posted on Jan 02, 2017
follow the top radiator hose towrds the motor. you'll see a hose clamp then on the otherside of that is the thermostat housing. there's two bolts holding it on. remove that and any other little brackets that are in your way and it's right there under that housing. Drain a few gallons out of your cooling system, remove housing, and pop old thermostat out. Clean the block and housing with some emery cloth, like $0.40 at auto parts store. (Note, that might not be needed if it's an o ring instead of a gasket. People at store can tell you for sure.) Once it's shiney, place new thermostat it put on new gasket and reinstall. If o ring, place o ring on thermostat and reinstall. top of cooling system, start truck, and keep topping off fluid till it's blowing good heat and not overheating.
Posted on Jan 02, 2009
SOURCE: 2005 GMC Sierra Overheating
If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.
Posted on Feb 05, 2009
The thermostat on this vehicle's (the Envoy & Trailblazer are essentially the same vehicle) In-line 6 cylinder engine is on the driver's side of the engine, below & behind the alternator. It is not found in the typical location (which may be for the 8 cylinder engine), in an answer above.
Most directions outline removal of the alternator to gain easy access to the hose clamps, bolts and housing of the thermostat. I have located a site that after free registration, has detailed instructions on how to do this job, and the link below that describes an easier method with photos. Check out:
Posted on Oct 19, 2009
May want to look at replacing the wiper circuit board.It is located on the firewall adjacent to the wiper motor and has a some what square black cover with 3 torx screws and wireing harness pluged into the side.We had a truck that every time you washed it the wipers would stay on until it dryed out.You can try removing it and spaying it down with contact cleaner just watch the brease on the two contact tips.Well hope this helps.
Posted on Feb 05, 2010
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