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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-09-2015, 09:03 PM
gprix77 gprix77 is offline
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Mein Auto: 1997 528i
AC Issue Need Advice

My 1997 528i AC Clutch on my AC compressor will not disengage, only if I remove the 12v supply will it disengage. it continually stays engaged and of course its not cooling when I engage the snowflake button. My auxillary fan is not working also I can get it to run when I connect a 12v supply to it, Im hoping its a bad resistor. I would like some trouble shooting steps what to check ie, fuses, relays . is it possible the compressor is toast and I should start looking at a replacement compressor

Thanks In Advance
Kenville
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Old 04-09-2015, 10:47 PM
edjack edjack is online now
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Mein Auto: '97 540i 6 speed
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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Old 04-09-2015, 11:26 PM
gprix77 gprix77 is offline
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Mein Auto: 1997 528i
Thanks In Advance, I have not rec'd yet but will check in am.

Kenville
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Old 04-09-2015, 11:35 PM
djmjd djmjd is offline
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The fact that it is running continuously but not cooling is a concern. Hook up a manifold gauge set to the low and high ports and tell us what the pressure readings are (while it's running obviously) and tell us what the ambient temperature is. You can buy a cheap manifold gauge set at harbor freight or (probably) borrow one from advanceauto/autozone/pepboys/etc. This will aid the diagnosis of a bad compressor.

The aux fan issue is almost certainly caused by a blown resistor. Check yours with an ohm meter. I think the one that typically blows is 1/2 Ohm. You can buy a new resistor set for >$100, or just buy a new resistor comparable to the blown one ( I'd suggest buying one with a higher power rating than the underspec'd OEM part) for just a few dollars and splice (solder) it in place of the one that was blown. You have to take the bumper and fan assembly off (much easier than it looks) to get to the resistors unless you want to hack up the fan cover/screen.

Last edited by djmjd; 04-09-2015 at 11:45 PM.
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Old 04-10-2015, 06:42 AM
gprix77 gprix77 is offline
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Mein Auto: 1997 528i
guys thanks i will check out the gauge at harbor frieght out of town today. I have taken the bumber off a few times since buying this vehicle last year not complicated. how should i test the resistors do they have to be removed not really savy with ohm meter.
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