Quote:
Originally Posted by rsv4dan
It's the radiator cap.
Pressure release from the system after you shut it down. I used to have an SW20 MR2 Turbo, they were quite bad for it because of the design of their cooling system. Fix for this was generally a new radiator cap or a higher pressure one.
I would start with replacing the cap.
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Sounds plausible, especially with the whole radiator fan coming on after a drive in 50 degree weather (first time ever I've observed it).