I had a few temp issues all of a sudden for a couple of meetings last year, when running on the same equipment i had been since the start of the season. I went through everything in the car and it was perfect condition and the problem remained!!!
The final thing i did was to totally re-wire the car inc connectors and sensor wire, problem solved straight away.
The car never performed badly before, just got mega hot, only thing i could imagine was that the wiring was fractured causing electrical resistance. I'm not certain but all i know is it solved my problem.
Hope this helps?
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