Chevy Impala: hat should I expect to hear from a mechanic?. Recently the ENGINE HOT A/C TURNED OFF warning pops up, but the engine isnt really hot. problem with my buddies Impala .probably the same issue deg) that they will display " engine too hot turning ac off ". I have an 06 Impala, read out on dash says " engine hot a/c off " the temp gauge drops to cold and rpms go up. The car is not hot, this will come on when I first start.