Blower Motor Trouble
I am having trouble with the blower in our 88 325i. We had replaced the transistor, and it lasted for a month or so... then speed 1 wouldnt work, then 2.. and so on. It stopped working entirely just over a week ago, so we had Bimmerhaus (bolton) replace the transistor again and lube the assembly up. Well, less than a week later it blew a fuse... we replaced the fuse and it worked great for about 30 seconds, and blew again. Yesturday, i replaced the fuse again and took the housing off of the blower. I turned it on and played with it for a couple minutes.. seemed OK. I threw it all back together and went for a half hour drive and the blower worked on all speeds. This morning upon starting the car up (in the cold), the fuse blew within 10 seconds.
How can i go about diagnosing this problem? The blower fans spin freely by hand with next to no effort.. i don't see why the motor is trying to suck so much juice that it is blowing the fuse!