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Old 07-12-2021, 03:28 PM
Join Date: Jun 2021
Location: Austin, TX
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Originally Posted by andrewwynn View Post
The DME controls the aux fan on the X5 with input from a handful of sensors
After work, I'll confirm but suspect the fan is not coming on a soon as the A/C button is on. The fan does work when engine temps are normal. A/C starts to cool as soon as it's moving. I'll turn on the A/C without turning on the engine.
'06 X5 3.0i - bought @143,123 miles (12/26/20)
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Old 07-13-2021, 01:30 AM
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Join Date: Jun 2015
Location: Racine, WI
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andrewwynn will become famous soon enough
I don't think the fan always runs from AC on. Mine didn't used to but my fan was broken and recently replaced.

I know with other cars I've had, the aux fan woukd come on at a lower ECT when AC was on but just 10-20 lower than when ac off.
2011 E70 N55 (me)
2012 E70 N63 (wife)
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Old 07-13-2021, 07:26 AM
Join Date: Jun 2021
Location: Austin, TX
Posts: 426
X5chemist is on a distinguished road
With the engine off and A/C on, the fan didn't start. I may try the craziest fix found on YouTube. Why not? A BMW tech confirmed it!
Low and high pressure switches work or the system would be toast. The guy went through 3 fans and a switch. I have the tools to evac and refill. High side pressure it at it's limit for ambient temps. If any atmosphere is present, the efficiency is lowered.
'06 X5 3.0i - bought @143,123 miles (12/26/20)
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