1990 E-34 Heater Problem - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 11-07-2004, 06:52 PM
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Hello, I own a 525i in nice condition eith 191,000 I replaced the heat valves under the hood and replaced the Blower Sword also and I repaired the right side stepper motor mount that that was broken right off. I stil have heat comming out of the left center Vent sometimes just a little warmer than the right vent now today the knobs completely turned all way to cold setting still heat out of left vent? I have the model with the 3 control levers and knobs not the auto one thanks if you can help me the Bently does not tell you how to diagnose and I can understand electrical testing also. So please help If you can I don't like the dealers around here in Michigan except one. Thanks
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#2 (permalink) Old 11-07-2004, 07:48 PM
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Duenevw: WELCOME TO THE BOARD!
Although you did repair some critical parts of the system here is what I think:

A. If air is blowing from the wrong vent (when not selected) then it signals a stepper motors problem and possible the control unit. AKA sword though you did relace but did you test it ?

B. If heat is blowing instead of the outside air then it points towards the heater valves being stuck open.

C. Also I would suggest a heater control simple test. Light comes on when you push the buttons, electronic switches AC light. In your case a dial knob does your fan work in all three speeds?

Hope this will help

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#3 (permalink) Old 11-09-2004, 02:57 PM
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Quote:
Originally posted by billB@Nov 7 2004, 08:48 PM
Duenevw: WELCOME TO THE BOARD!
Although you did repair some critical parts of the system here is what I think:

A. If air is blowing from the wrong vent (when not selected) then it signals a stepper motors problem and possible the control unit. AKA sword though you did relace but did you test it ?

B. If heat is blowing instead of the outside air then it points towards the heater valves being stuck open.

C. Also I would suggest a heater control simple test. Light comes on when you push the buttons, electronic switches AC light. In your case a dial knob does your fan work in all three speeds?

Hope this will help

regards
billb
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What is the proper way to test the heater valve operation I just spent 80.00 on a used heatervalves thanks Duane MI
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#4 (permalink) Old 11-09-2004, 04:53 PM
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Duenevw
Try this link for further details
http://www.bmwworld.com/repairs/e24.htm

Hope it will help
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