turn ac off and it cools down
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2004 GMC Savana 1500 Question: the engine heats up when ideling with ac on
Answer #1milesauto from Miles Auto Service Inc., August 22, 2012, 14:35Master
Need to check fan clutch operation. The clutch controls fan blade speed. If the fan cluch has failed it will cause the symtom you discribe.
pushrod August 22, 2012, 14:56Master
See if there is an electric booster fan that may not working.