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2004 BMW 325xi Question: What could cause the engine to overheat when air is turned on?

 

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Hunny75, Kankakee, IL, May 05, 2012, 19:09
 Rookie

After the air was turned on after driving on the highway about 30 miles. The car began to overheat and spray coolant and white smoke. This was all happened after the car was detailed.

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  • Answer #1

    jrich4344 May 06, 2012, 00:07
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     Enthusiast

    You may have air in the cooling system or a bad thermostat.

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  • Answer #2

    Autohaus Lake Norman from Autohaus Lake Norman, May 06, 2012, 12:43
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     Journeyman

    Being detailed shouldn't be the cause for the overheat. I suspect that you either have a faulty thermostat or faulty water pump. If you coolant was low from a leak somewhere (expansion tank for example), that can also cause overheating. If you recently had any work done, it could also be that there is an air pocket in the cooling system.
    Running the air conditioner puts extra load on the engine, which can facilitate overheating issues, if something is wrong.

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