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In Reply to: Re: BMW blower problem posted by stevecots on August 19, 2001 at 07:34:05:
I put new brushes in my blower motor, but I'm a nutty engineer type. Slowly twisted the squirrel cage off by twisting back and forth and pulling. Cracked the case by bending the little locking tabs and prying off the cover. Soldered in new brushes and its working fine 6 months later.
My blower slowly gave out over the winter on my '86 735i. The fan doesn't work at all now. I can still switch from heat to AC, etc. and it all seems to work, but only air is that forced through car at speed...insufficient to really cool or heat the car. How do I get at the blower motor? What should I look for, test, etc., first? Anyone have pix of the procedure? Thanks.
Does it work with only the defrost button pushed?
How about if the fan speed is pushed to the high speed.
Have you opened the cowel area and actually rotated the fan...
If the fan rotates freely, and the fan was working normally before... Then suspect the power transisters located unside the fan cage. While you have the cowel area open, remove the fan cage top covers and inspect the transister modules... When I replaced mine, the assembly was visably damaged and burned looking... The power transister modules are not cheap. $100USD ea and you need 2 of them.
Regards
John Stein
85 745
85 ///M6
If you need power tranistor modules, I have 6 of them and will let them go for $40 each including freight. Try putting power with a jumper directly to the two leads on the blower before you try to remove it, that way you can determine if in fact your motor is bad or if it is one of the other controls. The blower motor is a bear to get out if you've never done it before. Plan on spending about an hour to get it out, very tight and there are a few little tricks like removing all shrouds. If you want a used blower I have one of those also, figure $100 including freight. steve 847-251-1228 stevecots@aol.com
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