Thank you for all the responses,
I don't there there is a leak in the radiator, under the car looks dry, but I do know they are prone to failure. I did install the Soho oil catch can/ coolant overflow just recently maybe that introduced a bubble, but driving to and from the track the temps looked very normal. I didn't notice any contamination at the top of the coolant tank or white smoke out the exhaust. But I'll have my mechanic do all the checks mentioned.
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