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Old 03-29-2011, 11:38 PM   #6
5th Gear Member
Join Date: Sep 2005
Location: T·O·R·O·N·T·O
Posts: 1,058
The FSU in my E39 failed twice. The first time I had the same symptoms. The second time, it just wouldn't "blow" at any setting.

Now back the first time, I did the same kind of test with a clamp meter to no avail. What I did was stay with the car for 10 minutes and then noticed the blower fan turning on by itself when the car is off when it's not venting. Bingo.

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