Why is my car building up back pressure

Asked by GuruX8GRW Nov 10, 2018 at 01:15 AM about the 2002 Oldsmobile Alero

Question type: Maintenance & Repair

I have an Oldsmobile Alero
2002 that have been having
overheating problems well I
know that it had a blown
head gasket I took some
bars leak fixing repair seal
head gasket and put in it
and then it just the way it
said to do it but it's building
up back pressure and
pushing water out the
Overflow why is that

3 Answers
159,085

Bob answered 6 years ago

Why is that? Because the head gasket is bad and needs to be replaced. The magic stuff in the bottle doesn't always work.

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65,510

firebird338 answered 6 years ago

Try bleeding air from system like this remove cap from overflow tank fill with antifreeze to full mark leave cap off and start vehicle and let idle you will notice level in tank start to rise this is normal once thermostat starts to open level in tank will drop add more antifreeze to full mark then put cap back on. If still pushing antifreeze out through overflow tank head gasket motor be replaced.

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