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X5 E53 (1999 - 2006)
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Old 09-09-2012, 04:12 PM
Primcast Primcast is offline
Registered User
Location: Trenton
Join Date: Sep 2012
Posts: 9
Mein Auto: X5
Slow Overheating evry other day


Hello every-1.
I have been monitoring this site for a while now and finally have the balls to join this fantastic site.
I must say that, I'm very disappointed with my 2002 X5 since owning it 2yrs ago.
It's been 1 problem after another. From Axle to Suspension to AC.

The resent one started after replacing the AC blower motor resistor. AC blower came back on-line for about 1hr and then it started blowing warm air intermittently, particularly when I'm idling, in slow traffic or @ a light. Freon level measured normal. Then occasionally. the coolant level signal indicated low and had to top it every other day, but could not observe point of leakage at the time.
It turns out that it leaks from the mid-level hose connection @ the expansion tank when the engine is off. I removed the expansion tank for inspection, but there are no visible cracks.
I also made direct connection from battery terminals to the Auxiliary fan pins, but the fun did not come on.


1) Is this the correct way to "TEST" the aux fan?
2) Can this type of leakage be caused by a faulty aux fan?
3) If not, then what should I focus my attention on and what parts need to be replaced?
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