Quote:
Originally Posted by AusTx68
With a thermostat in place the engine would initially start and run normal temp. As I started driving the combustion pressure entering the coolant would gradually cause an air bubble in the cooling system. Once that happened the temp would spike....
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Gotcha. Yeah, that definitely indicates a hot exhaust leak into the coolant system. As geezer#99 mentioned it's you can't always find these things with leak test equipment especially if the problem is occuring under high heat and pressure from the engine.
forgot this: I know it's a little late but here's a good you tube video on doing a coolant test.