[MR2] AW-11 Blower Motor seems weak on high setting

[Kurt Krueger]

On 6/14/2011 9:33 PM, William Brandt wrote:
> This seems weird but the blower has never been changed in 25 years and 285,000 miles - it goes through the 4 speeds on the switch and yet on "high" the airflow seems weak -
>
> Does that make any sense? (I can say no and yet.....)
>
> It it a simple brush electric motor?
>
> Since I really can't remember the airflow 20 years ago it is impossible to compare -
>
> Bill
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High speed applies 12v directly to the motor, bypassing the resistor 
pack.  So you could have a connection problem in that part of the 
circuit.  Best test would be to put a voltmeter across the blower 
terminals and see what you get.  Try all the speeds.  The fan draws a 
lot of current, so I don't expect full voltage on high.  But it should 
be close, and definitely higher than on the slower speeds.

And yes, it is a simple brush motor.

Another thing ... there's lots of foam gaskets on the flaps that control 
air flow.  Rotted foam could cause air routing problems.  I had the 
extreme case on a Corolla that sat for a couple of years ... mice 
plugged the air ducts.