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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 01-22-2013, 10:19 AM
kgorczyn kgorczyn is offline
Officially Welcomed to the 'Fest
Location: Melbourne, FL
Join Date: Jul 2005
Posts: 337
Mein Auto: 2000 528i SP/PP
AC Will Not Engage

So my HVAC system has been acting 'funny' last few months. Sometimes when I start the car it doesn't work (it turns on and looks ok, but changing the fan speed, vents, temp, etc. does not work - it shows the changes on the LCD but does not apply them) - I turn off and on the car and then it's fine again.

Now however, I have a different problem that a restart will not fix.

HVAC Unit turns on fine, I can regulate the temp, all functions work, except the AC. When I press the AC button it turns green, but compressor does not engage, RPMs do not kick up. It's like it isn't doing anything.

Any ideas on what this can be? I reseated all the HVAC connections on the back of the unit, it did not help. I also disconnected the battery for 15+ minutes, did not help.

Last edited by kgorczyn; 01-22-2013 at 10:21 AM.
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