Thread: AUX fan woes
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Old 09-15-2020, 11:22 AM
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Overboost Overboost is offline
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Join Date: Apr 2006
Location: Huntersville, NC
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UPGrayd, a couple of the members here can be annoying for sure but most of us are happy to help fellow X5 enthusiasts any way we can. Just shrug them off.

If I ever doubt my fan is operational, I simply unplug the AC pressure switch shown below with engine running and AC on and the fan will run full song after 5 seconds. This will at least let you know you have an operating fan but may not diagnose your DME controlling it dependant on engine temp. For that you need the cable you have ordered and a copy of INPA installed on a PC. My guess you have a fan out or going out and the quick AC pressure switch test will let you know. Mine is a 3.0L M54 model but I would guess your diesel M57 would have the same AC pressure switch.
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Last edited by Overboost; 09-15-2020 at 11:35 AM.
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