2003 Tbird - Air in cooling system

Does anyone have a trick to get the air out of the cooling system? I’ve burped it 5 times. Every time it will run at normal temp then all of a sudden start overheating. As soon as I turn the heat on it drops back to normal. This is the second time I’ve replaced the heater control valve and both times I’ve had the same problem with air pockets. It’s also a new tstat and recently been flushed.
 
How many miles is on the car? No leaks showing?? If you continue to get vapor in the system after following the proper burping procedure in the manual, you could have some type of a internal leak of the cooling system. A head gasket leak or cranked block are possibilities. The radiator can be checked for the presence of carbon dioxide, CO2, from the combustion in cylinders with a test kit like in the links below. Can be gotten at NAPA or other auto parts stores too.

https://rover.ebay.com/rover/1/711-...0001&campid=5338236430&icep_item=323259222494

http://rover.ebay.com/rover/1/711-5...0001&campid=5338236430&icep_item=312746279910
 
Does anyone have a trick to get the air out of the cooling system? I’ve burped it 5 times. Every time it will run at normal temp then all of a sudden start overheating. As soon as I turn the heat on it drops back to normal. This is the second time I’ve replaced the heater control valve and both times I’ve had the same problem with air pockets. It’s also a new tstat and recently been flushed.

I read a thread a while back, I think there is a bleeder valve under the hood on the drivers side up close to the windshield.
 
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How many miles is on the car? No leaks showing?? If you continue to get vapor in the system after following the proper burping procedure in the manual, you could have some type of a internal leak of the cooling system. A head gasket leak or cranked block are possibilities. The radiator can be checked for the presence of carbon dioxide, CO2, from the combustion in cylinders with a test kit like in the links below. Can be gotten at NAPA or other auto parts stores too.

https://rover.ebay.com/rover/1/711-...0001&campid=5338236430&icep_item=323259222494

http://rover.ebay.com/rover/1/711-5...0001&campid=5338236430&icep_item=312746279910
It’s got 110k. There are no leaks that I have found. The car runs perfect and I don’t believe there is a head gasket leak or cracked block. I’ll look into those kits. Thanks
 
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