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Old 05-22-2008, 12:37 PM   #1
NemesisWRX
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Default HVAC Issues: Fan won't turn on!

Hello everyone,

I have been trying to find any info on this for the last few days, but my searches can't seem to uncover anything useful.

THE PROBLEM:

This whole thing started about 4 months ago. I shut my car off and went in to work. Upon coming out I noticed to my surprise that the HVAC fan was running with the engine off and the key out of the ignition! I sat there dumbfounded trying to figure out what the heck was going on, figured it was some kind of relay and went about my business. The next time I shut the car off, the fan turned off as well, just like normal. When I got back into the car, the fan was back on! Getting angry now I checked all the fuses related to the HVAC system and they were all good. I then began to make sure that I turned off the fan switch before leaving the car. This solved the problem for the time being. After about 2 weeks of this random fan issue the system seemed to "fix itself" and i didn't see the problem for probably 3 months.

The next time this started to happen was right after I cleaned my engine bay, only this time there was no delay between the time I shut the car off to the time that the fan would come back on. The fan would now turn on whether or not the car was on. That was kinda cool for a while; on hot days I could shut the car off, run into a store quickly and leave the fan on low, keeping the interior nice and cool. Well, it didn't last.

Fast forward to yesterday. I get in my car and go to turn the fan on...NOTHING HAPPENS! I have checked all the fuses again and they are all good. I can hear a relay clicking whenever the fan switch is turned from 1 to 0, but not when going from 0 to 1. Oddly enough, the A/C switch still lights up and the A/C clutch kicks on whenever the fan switch is turned on, only the fan doesn't turn on with it. I don't think it is a problem with the fan motor itself due to the issues I've had over the past few months, and I'm 99% sure it is a dead relay. My problem is that I can't seem to find any info on where this relay may be. Further, I can't really find ANY info on the relays in my car, specifically which ones do what and where certain ones are located. I suspect that the relay is either in the engine bay or near it, as the problem resurfaced when I washed the engine. Some water probably got into it and made it sticky.

Does anyone have any info on the relays for our cars? HVAC info is all i really need right now, but I suspect there may be another faulty relay or two that are causing a couple other gremlins in my car.

Thanks!
Ben
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Old 05-22-2008, 03:46 PM   #2
ProdriveDreams
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pretty sure hvac relay is under the hood, but i would suspect the blower motor resistor which a black box behind the fan control knob, does it work in 4?
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Old 05-22-2008, 04:59 PM   #3
NemesisWRX
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Quote:
Originally Posted by ProdriveDreams View Post
pretty sure hvac relay is under the hood, but i would suspect the blower motor resistor which a black box behind the fan control knob, does it work in 4?
No, the switch doesn't work in 4, I was thinking the same thing for a bit about the resistor, but then it should work at the highest setting.

Does anyone know where the relay is located exactly?

Thanks for the help!
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Old 05-22-2008, 10:13 PM   #4
ProdriveDreams
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ill check for you in the service manual tomorrow at work if no one gets too it sooner.
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Old 05-26-2008, 10:15 AM   #5
NemesisWRX
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Hi again,

Sorry to bump this up, but it's getting rather hot outside now and my lack of concern about this problem is starting to disappear. Does anyone have some access to a diagram that can help me locate the faulty circuit, ProdriveDreams? Anyone else?

Thanks!
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Old 06-05-2012, 03:14 PM   #6
jdmjack
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Did you ever solve the problem? I'm having the same issues!
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Old 06-05-2012, 05:37 PM   #7
Cougar4
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The only way the blower can get power to it and turn it on without the ignition being turned on is to have the blower relay contacts stick together. I think the blower relay is located way up under the left side of the dash area. If the fan is staying turned on you might be able to tap on the relay with a screwdriver handle to turn it off and then replace it.
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Old 06-08-2012, 09:04 PM   #8
jdmjack
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My fan just isn't turning on at all
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Old 06-08-2012, 09:11 PM   #9
jdmjack
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I've heard there is something related to it behind the glove box. I recently unscrewed it to change my cabin air filter. Is it possible I disconnected something?
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Old 06-10-2012, 08:09 PM   #10
jdmjack
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bump...anyone?
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Old 06-11-2012, 06:03 AM   #11
Cougar4
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Quote:
Originally Posted by jdmjack View Post
bump...anyone?
Check to see if voltage is getting to the fan motor. If there is voltage there then the trouble is most likely with the resistor pack that is located on the return side of the circuit, after the motor. If there is no voltage then look to the blower relay as the trouble.
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