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E28 (1982 - 1988)

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  #1  
Old 01-24-2009, 09:08 PM
lthometz lthometz is offline
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Mein Auto: e 28 BMW 535i
Heater Blower Motor e28 1985 535i

Question on Heater Blower Motor e28 1985 535i: Did they come with a Blower Control Transistor?
My Heater Blower stopped working, but the AC does work. The scenario started when I had my heater on full blast for a length of time (30 minutes). I know there are two blower motors. I had followed instructions on removal of the blower motor and the squirrel cages located behind the panel I engine compartment firewall. My questions are:
Do the 1985 535i have a similar NTE181 Transistor like the instructions one finds on other boards or was it added after 1985 e28 models.
If does have a transistor, is it located on a different area of vehicle?
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  #2  
Old 01-25-2009, 10:56 AM
jimoreno jimoreno is offline
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Mein Auto: 2006 X3
There are no transistors on the fan but there are resistors. If your fan is not working first thing to check is if there is voltage on it. Your heater fan is the one in the engine firewall. Use your multimeter and check for voltage. If you have voltage, your fan is dead and you'll need a replacement. There were two fan suppliers, Sofica and Bosch so note which one you have. Now, if you don't have voltage at the fan terminals your A/C switch has gone bad (it switches between heater and A/C fan). It just happened to me about 6 months ago. There was a change in A/C switches by the end of '86.
Good Luck
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Jimmy Moreno
1995 530i
1986 535i
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  #3  
Old 02-07-2009, 02:52 PM
lthometz lthometz is offline
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Thanks, I changed the fan from my parts car and all is working. Appreciate the advise.
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  #4  
Old 03-07-2009, 08:30 PM
lthometz lthometz is offline
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Now it works! Thank you.
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  #5  
Old 05-17-2010, 07:57 PM
kkau kkau is offline
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Location: New Jersey
 
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Mein Auto: 1988 M5
Quote:
Originally Posted by lthometz View Post
Thanks, I changed the fan from my parts car and all is working. Appreciate the advise.
Hi, I'm new to the forum, and recently purchased a 1988 M5. I have a similaer problem where the AC blower works fine, but not the regulaer fan and heater. It will smell like electrical burning (and smokes) when I have the normal fan switched on. From what you described here, sounds like the heater blower is by the firewall? Can you tell me how to get to and replace it? Thanks!
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  #6  
Old 05-17-2010, 11:48 PM
Murad Issa Murad Issa is offline
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Mein Auto: bmw 5 series
Hi All,
I am also new for the forum and purchased a 1982 520i e28. The fan works properly but the heater does not. Any advise that you can give me is appreciated.
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