Mechanics

BMW 323 BLOWER MOTOR PROBLEM

2000 BMW 323 • 90 miles

Had been experiencing intermittent HVAC blower motor. It has quit altogether now. I checked fuses and seem to look good. Turned off and on various settings and fan speeds.
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Paulmeys
January 17, 2013.




You need to start out by testing for power and ground at the motor and see which one is missing if any.

Wrenchtech
Jan 17, 2013.
OK. I was thinking a relay or resistor with it being intermittent then quitting altogether. BTW It had 90,000 miles Guess it doesn't recognize the 'K' designation. Thank you.

Tiny
Paulmeys
Jan 17, 2013.
Unless you're going to test it as I asked, I guess we'll never know.

Wrenchtech
Jan 17, 2013.
I don't own a multi-meter, plus being color blind I was never able to dive into the DC aspect of electrics. Component replacement is simple enough for me providing I know where it's located. Anything else and I'm lost. I'll check the tightness on the contacts on the motor and see. Is there another way of testing power and ground on the motor?

Tiny
Paulmeys
Jan 17, 2013.
With a test light or a meter. You need to test BOTH power and ground.

Wrenchtech
Jan 17, 2013.
I'll have to look for the test light. Where is the blower motor located and the easiest way to access it?

Tiny
Paulmeys
Jan 17, 2013.
I don't mean to be insulting but this isn't looking too promising for you to be able to diagnose this problem. It's going to get much more complicated from this point and a BMW can be one of the more difficult cars to diagnose. There is only so much I can do over a computer and you need to have some abilities on your end.

Wrenchtech
Jan 17, 2013.
OK. Any thoughts on about how much it might cost? I know a relay is cheaper than a control unit. Lets say least to most. Thank you so much for your input.
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Tiny
Paulmeys
Jan 17, 2013.
It's a BMW. Nothing is cheap. It can be anywhere from $50 to $2000, depending what it needs. Some of the electronics can be very expensive.
There is about 10 different system models loaded with solid state controls that can be very difficult to diagnose without some expensive equipment.

Wrenchtech
Jan 18, 2013.

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