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Old 02-05-2003, 12:39 PM   #1
jeffg
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Member#: 2958
Join Date: Nov 2000
Chapter/Region: NWIC
Vehicle:
2001 6.0?RS

Default Heater only works on 4(high)

I recently noticed that my heater is kind of broken. I only really use it to defrost the windows. The last couple of days I defrosted the car using the heater on 4. As I drove to work, I would turn the heater down to 2, and the windows would begin to fog up again. If I move the switch to 4 I can actually feel the air flow and the windows clear.

There is very little or NO air flow on any other setting by 4. Does anyone know a set of tests, or things I can look at to try and fix this. I know I could take it to the dealer for a fix, but since I removed my AC, I think they would try and charge me for the repair.

Any help?

J
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Old 02-05-2003, 01:12 PM   #2
avk
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Member#: 17252
Join Date: Apr 2002
Chapter/Region: Tri-State
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'06 WX8
59E

Default

Likely an open circuit in the resistor pack. With switch in "4", the resistors are bypassed and the blower still works.
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Old 02-05-2003, 01:53 PM   #3
Opie
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Location: Riverview, Florida - U.S.A.
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2016 Legacy 3.6R
'15 FXT, '16 XV, '99 RS

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Simple fix, the A/C Fan Relay has gone bad. It's somewhat common. The relay costs about $35 from the dealer, it's located behind the glovebox. Replace it and all 4 fan settings will work again!
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Old 02-05-2003, 04:23 PM   #4
jeffg
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Default

Opie,

You say it is the AC fan relay. Would removing the underhood portion of my AC system have any effect on this? I have not touched anything under the dash, but I did remove the compressor, condensor and all of the underhood lines.

Is there anyway to test the AC fan relay? I assume it is like a normal relay and I can supply voltage to one pin and it will switch it to somewhere else.

Anyone have details testing instructions for this?

Thanks

J
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Old 02-05-2003, 04:50 PM   #5
Opie
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Location: Riverview, Florida - U.S.A.
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2016 Legacy 3.6R
'15 FXT, '16 XV, '99 RS

Default

Hmmm, removing parts under the hood shouldn't have affected it. I doubt you could've caused a surge or voltage spike that might of damaged it.

I had the relay go out twice on the '95 Impreza I used to have. Same symptom, fan would work only on the highest setting (4). Part number for all '93-'01 Impreza's is 72024AA000. I don't know if there is any way to test it...maybe you could take yours out and test it in a friends Impreza and vice-versa.
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Old 02-05-2003, 05:06 PM   #6
avk
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'06 WX8
59E

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That p/n is for the resistor pack:
http://www.subaruparts.com/cart/?pn=72024AA000

Last edited by avk; 02-05-2003 at 08:19 PM.
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