Several times I have changed my coolant, replaced head gasket once, replaced water pump once, and replaced radiator,and I have never had problem with air in the system. I top off the radiator, start the engine with heat on high, and add coolant to the system as the coolant drops in the reservoir tank.

The only time I had an overheat situation was when the aux. fans or the main fan wasn't turning on due to defective temp. sensors.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible