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Guest Message by DevFuse
 

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Heater Blower Motor


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3 replies to this topic

#1 The Dude

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Posted 28 July 2004 - 05:57 PM

99 Forester 160,000 miles. The heater/ac blower motor (in the cabin) has become intermittent. Sometimes the blower will not come on when the car is started. Once it starts, however, it works perfectly for the duration of that trip. Moving the slider from recycle to outside air usually gets the fan going. My guess is the blower relay or the motor brushes. Does the blower motor have replacable brushes? Any help would be appreciated. Thanks.

#2 SevenSisters

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Posted 28 July 2004 - 06:22 PM

I don't know if the brushes are user replaceable, but a local motor repair place could tell you and sell you the brushes if they are.
If is not an easy job, they could probably repair if for a lot less than a new unit.
Give 'em a call. I know a former co-worker whose chevy van burned in the parking lot because of a faulty blower motor.
Good luck.

#3 amsisubaru

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Posted 03 May 2005 - 09:46 AM

99 Forester 160,000 miles. The heater/ac blower motor (in the cabin) has become intermittent. Sometimes the blower will not come on when the car is started. Once it starts, however, it works perfectly for the duration of that trip. Moving the slider from recycle to outside air usually gets the fan going. My guess is the blower relay or the motor brushes. Does the blower motor have replacable brushes? Any help would be appreciated. Thanks.


Hi, The AC and Fan in my 90 legacy works when it wants to. Sometimes turning thr car off and back on will cause it to work again. Anyone have this problem?Thanks


My fan went on and off, after a bump or pounding the dashboard with my fist. I read this newsgroup-- that the bad unit could be relays, switches, and fan resistors. I finally removed the dashboard, slid out the AC / Heater control panel, unplugged the connector in the rear and took the front of the control panel case off. Two more screws and I lifted off the rear circuit board and examined the solder points for the plug connector. Several of the solder connection had very fine cracks and when I moved the plug part I could see the cracks (and the soldered pin) move, but, this is very small movement and small cracks. Under a 4X lens the cracks on three pins were easier to see. So, I simply reheated the solder joints on all the pins and added some fresh solder to make a more secure phsical connection. Instant and complete relief!

The reason the solder joints cracked in the first place is that the wire cable and plug that connects to the rear of the control panel has significant inertia. After 15 years the bumping and jarring wiggled that plug enough to crack the joints, even with strain-relief strapping. After the cracks developed, oxide probably built up enough to hold the connection open until another bump (or my fist) knocked the connection together again.

I ran through a lot of tricky hypotheses trying to find a way around taking that dashboard off, like the relays, a vaccuum leak, the diaphragm, and the fan motor. Also, since the fan often started when I first started the car I though it might be some sort of element heating.

Good luck.

#4 Cougar

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Posted 03 May 2005 - 11:45 AM

Since you stated that the motor usually comes on while moving the slider I would suspect that the problem is near that area and not in the motor. The problem may be with the fan speed selector switch.




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