Question about 1999 Audi A4
In the last week my fan has started working intermittently, and I can't figure out what the problem is. Even when I turn the air conditioning on, it still won't come on. It may come on though 10 minutes later?!
This is a common fault and is caused by worn brushes on the blower motor.
Removal of the motor by dismantling the glove box assy, then turning the brushes 180 degrees or replacing them will solve this.
Posted on Jan 23, 2009
This isn't the failure I am accustomed to seeing with blower fans which is a problem with speed controls and only the highest speed working due to a defective multitap resistor.
Your problem sounds a lot like a faulty (or failing) switch or possibly a connector that is no longer contacting as it should.
Try moving the speed control back and forth multiple times to see if this affects the fan startup. If it does, then the control itself has failing contacts. If this has no effect, then the blower motor brushes may be growing too short from not being pushed by a light spring that should push the brushes inward to compensate for the normal wear. Sometimes the guides in which the brushes sit are gummed up so the little bit of spring tension isn't adequate to overcome the stickiness in the guides.
Posted on Nov 18, 2008
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Posted on Jan 02, 2017
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