I just got my car back from popping in a new engine and switched from a unichip to accessport. Anyway, I drove it 50mi. or so..turned it off and came back probably 15min later and was able to drive a few blocks before my temp gauge started to significantly rise to an unacceptable level. Normally I'd check the hoses and thermostat but I just got the car back like 1hr ago. The only thing I can think of is that I put the A/C on too high and quickly...I'm gonna check it out after the sun goes down. Any ideas besides checking the above mentioned would be great.