does cap on overflow tank for radiator need to be tightened all the way


Asked by Dec 03, 2014 at 10:20 AM about the 2000 Pontiac Grand Am GT

Question type: Maintenance & Repair

Car is blowing cold air inside and temp. gauge is moving up and down alot could it be air
bubble or is cap to tight on overflow tank

3 Answers

Tom Harmon

Nope ... there is a vent hose on the side of the tank so even if it's tight it would not make a differnce

Tom Harmon

Try rotating the directional knob back and forth ... that knob directs the vents that are vacuum controlled ... sometimes the O rings get flat that are inside the knob and it doesn't open the heat


The overflow tank's contents just fills and empties with the requirements of the cooling system- the cap should be tight- check the rest of your cooling system- it is a closed system- maybe you have a leak? there should be no air bubbles unless you had work done recently- the moving gauge should be a concern because you can't tell how hot your engine is running-

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