Replaced coolant cap and both t-states and new coolant and flush..tempeture gauge sometimes warms up part way then falls like t.state stuck and sometimes blows out overflow and temp gauge not over 190 oil looks good
Make : Chevrolet
Make (other): Chevy
Flush and fill rad..new rad. Cap, new t..states,both had exhaust checked for hyper carbons it's ok,,slight bubbles in overflow tank,, could it be egr valve or egr cooler?? Never been over heated...
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
No, the EGR cooler or valve would simply burn the coolant and you would see white smoke.
This is a fault in the head gaskets. The issue in this case is a faulty sealing ring on the #2 and #7 cylinders. This allows the combustion pressure to push into the cooling system and then pushes out the surge tank.This will not push coolant into the cylinder so it will not smoke. The replacement head gaskets are updated and do not have the same ring or design so repeat failures are not an issue. THe gaskets take about 36 hours to change in a shop as there is lots to get out of the way. Many even lift the cab off.
It can with the low coolant level.
Is the level currently low?
Yes it would. AS pressure builds, it stops the coolant flow which is why those items react.
Although there is a slight chance this is the water pump,
Do you have the means to look for a stamped number on the housing?
No recalls, no.
There was a bulletin on the water pump, but that is info only
If this is head gaskets then it is about 1800 for parts and 30ish hours labour.
Put the coolant overflow hose into a pop bottle, if it gets coolant in it, then I am sure it is the head gaskets.
Every single on I have had with coolant in the bottle has been the head gaskets.
I am thinking more like 98% chance.
At this moment, no.
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GM Grand Master Technician 2007. 11 years experience.