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There are several sensors and switches on the HMMWV engine each with a different purpose. The sensor behind the alternator near the front of the left cylinder head is the signal to the temp gauge. The temp switch on the intake manifold is the signal to the cooling system. The temp sensor on the...

Did you check the cold start switch to make sure it's working? It's there to help the truck start in cold weather. As for a mechannic, check with Dave Hamilton over in Tooele at Hamilton Diesel Service.