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E46 - OAT Climbs ONLY when AC is ON

788 Views 6 Replies 6 Participants Last post by  alpinweiss
I've searched quite a few OAT issues, but never have I found this one.

If the AC is off, all is well. The OAT registers properly. The minute I turn the AC on, it starts climbing about 2*F a minute !, even at highway speeds. This is the OAT, NOT the coolant temp !

If I turn the AC off, it will fall (slower)..

I've never had the AC on in this car and was preparing for summer.

Any ideas about what could be causing this ?

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