i have a 2002 buick that is over heatingso i flushed radiator changed thermostat so it work for 24 hours but i keep getting air in my coolant system its been pressure tested no sign of blown gaskets

Tim Ives

Asked by Nov 15, 2014 at 10:49 AM about the 2002 Buick Rendezvous CX

Question type: Maintenance & Repair

did not have any troubles with air lock in coolant system before
thermostat was changed

7 Answers

Just run it with the Cap loose So it will burp all the air out of your coolant system

2 out of 2 people think this is helpful.
Tim Ives

i have tried it seems to suck the air right back in

Then you have to add coolant


You said pressure tested but did you have it block checked? These engine don't like too much excessive heat so compression gasses can be getting into the cooling system causing air pockets. Make the engine is cold remove radiator cap, start engine and watch for bubbles in the coolant, if you see them then there is a head gasket or head problem.


The proper test is a combustion leak test. the kit is about 40 bucks. Also, many mechanics have a sniffer for your exhaust that will tell the tale

Tim Ives

the combustion test kit is that something i can get a autozone


they should have it, i know napa does. you will need some kind of vac pump to suck air through the blue fluid. some kits come with something for that. you will see what i mean when you look at the kit. Scottykilmer.com has a great vid on how to perform this test check it out.

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