[MR2] AW-11 Blower Motor seems weak on high setting
telek2 at frontier.com
Wed Jun 15 10:19:07 EDT 2011
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 -
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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.
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