Question about GMC Envoy
Last week I was driving back home when my Envoy decided to overheat I was in the middle of traffic I couldn't get out so I shut down the engine. When I got home there was no antifreeze in the radiator but i did notice that it was in the overflow tank. My thoughts was that the head gasket broke but the oil did not look milky and i forgot to mention that i did not see any puddles of anti freeze any where. So today I changed the thermostat and the water pump I'm still overheating and also now i have a rough idle (I also forgot to mention it did the same thing yesterday when I went to the super market) So heres a list off things I did already: Changed thermostat, changed water pump and flushed the system. take notice that I do not have antifreeze in the motor so I ruled that out but I am smelling gas when its in rough idle though. Can someone help me please :-( Oliver
Do you have heat coming out of the heater after the thermostat opens? If you do and the truck is still over heating the head gasket could be blown and burning the antifreeze through the cylinders and thus would cause a rough idle. You may want to run a compression test on the truck. Just to be sure your assumption is correct that the head gasket is good. Have you felt the heater hose to make sure it is circulating through the heater and it is not plugged. Hope this helps.
Posted on Mar 14, 2017
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Posted on Jan 02, 2017
The rust is probably in the engine. There are many little pockets, water ways, water jackets (around the cylinders), etc, so getting all the rust out without dunking the block and heads in a cleaning tank is about imposible. I would recommend giving it really good flush every 4 to 6 months. I would try flushing the radiator before replacing it because it is probably not rusted, even though it is full of gunk.
Posted on May 18, 2009
If the replacement heads were not new, they may have been previously warped causing combustion products to leak into the cooling system. Another cause of this problem is improper torquing of the head bolts.There is a fairly simple test that a well-equipped shop can perform to check for such leakage. If the test is positive, then the heads must be removed again, tested for flatness (resurfaced if possible), then reinstalled with fresh gaskets and proper torquing of the bolts. Not the answer that you were looking for. Good luck!
Posted on Jan 04, 2010
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