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Old 02-06-2012, 01:26 PM   #1
1slowwagon
Scooby Newbie
 
Member#: 299685
Join Date: Nov 2011
Location: MN
Vehicle:
1997 Legacy Wagon

Default Bk legacy fan probelm

I have a 97 legacy and as of yesterday my heater\a/c fans no longer work.
When I turn the fan knob I can hear a slight click coming from the fuse box area. I checked all fuses and they were all good, also ripped apart dash and checked for any bad wires and connections and i couldn't find any. and living in MN i would like to solve this issue asap, anyone have any ideas on what it could be?
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Old 02-09-2012, 07:15 PM   #2
Rally Monkey
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Member#: 36310
Join Date: May 2003
Chapter/Region: SWIC
Location: Scottsdale, AZ
Vehicle:
03 WRX Sedan
Silver

Default

Bad fan motor? Sounds like it's not the swith, fuse or wiring if your getting some sort of elecrtical conectiion but the only way to know 4 sure is a multimeter. You can check the resistance of the motor to see if it is bad and voltage of the wires for shorts and opens.
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Old 02-13-2012, 09:56 AM   #3
Jessekrs123
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Member#: 236927
Join Date: Jan 2010
Chapter/Region: NESIC
Location: Oakville CT
Vehicle:
1993 Legacy Sedan
1984 BRAT

Default

Pretty common problem for an older Subaru.

Have you tried putting the fan on full blast?

There are a few things that can be at fault here, the best way to pinpoint where the trouble spot is, is to test for power at certain points through the heater circuit.

First, double check your heater fuses aren't blown, I believe there are two 15A fuses that the circuit runs off. Test with a multimeter, sometimes blown fuses aren't as apparent as they might seem.

Next thing is to find your blower motor relay up behind the steering column. There will be a white connector into a 4 pin relay, looks exactly like the fuel pump relay which is green, which should be in the same general area. Unplug the connector, and with the fans on, check for voltage at the connector, this will confirm that the fuses are not blown, and that the relay is receiving proper voltage. Plug the connector back in if you have power. If there is no power, your issue is either the 12v source, or the fuses.

Next thing is to make sure that the relay is "relaying" that power to the blower motor resistor which is located behind your glove box. There should be a metal box with a 4 pin connector going into it. (Not 100% sure if that pertains to your model, but you get the idea) Unplug that connector and with the blower motor on, test for power at the connector. If you have power at the connector, then that confirms that your relay is doing it's job. At this point the issue could possibly be the resistor. An easy way to test this is to try to run your fans on the highest setting. If it works on the highest setting, but nothing in between, there is a good chance that your resistor is at fault. If you are getting power to the resistor, but the fan still fails to function, plug the connector back in and make your way to the blower motor itself.

Unplug the connector going into the blower motor and test for power with the fans on. If there is no power to the motor, but power tests out everywhere else, then you can confirm that the blower motor resistor is at fault. If power is getting to the motor, but it still fails to spin, than that confirms that the blower motor itself is at fault.

Also test for ground at every connector to make sure that there isn't a short anywhere.

It is a step by step process to rule out where the power is being lost. Start at the source and work your way forward, you will eventually find the problem, and confirm what is at fault instead of replacing unnecessarily needed parts.

In my experience, it is rather common for the relay to crap out, and sometimes the blower motor resistor can get blown out as well. Never seen a blower motor mechanically fail before, and I've worked on many older Subarus.

Last edited by Jessekrs123; 02-13-2012 at 10:01 AM.
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