2006 Saturn Vue V6 the air is warm in traffic but cools down significantly at higher speed.
I agree with philip, i have not studied the electrical system. but to my best guess the electric fans are tied into the engine cooling system. when the engine is not requesting the fans to come on. then their is very little air passing threw the cooling package. When their is no cool air passing by the condenser this will not draw the heat out of the refrigerant leaving excess heat in the system and when the cab fan blows this is were the excess heat is getting dumped. then at higher speeds their is enough air passing threw the condenser and radiator to cool them both.
Fan not drawing air through rad.When driving at high speed the air is rushing through the rad and cooling it down.Check the fan is working!!
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