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Old 02-03-2013, 01:38 PM   #55
dmax
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Join Date: Aug 2006
Location: NJ
Posts: 23,427
My Ride: '99 328i 300K miles
Overheating only with AC on and while idling? Could be fan, but I believe it could also be therm or the temp sensor on lower hose. There are a number of 'feeds' to tell therm to open. If yours was an aluminum housing therm, that makes it suspect.

I know the fan should come on for a few seconds when you turn on the AC, just so the car knows it works, but usually it will be off. I don't otherwise know how to test it.

You'd might have some codes stored that would help you diagnose this...find a local with code reader.
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