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Old 11-29-2008, 06:30 PM   #1
mxpunk
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Default Radiator Fan operation - 02 WRX

My car is a 2002 Impreza WRX sedan, only motor mods are an hks catless up pipe and a invidia bellmouth d/p.

I noticed that when the car is idling for a prolonged period only one radiator fan comes on. I tried turning the A/C on and only one fan came on. So far it only seems like the passenger side radiator fan is working and not the other one.

Is something wrong here at all? The car runs and drives great, but I am alittle bit concerned because im pretty sure both fans kicked on in all of my other cars, including both my 96 impreza's.
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Old 11-29-2008, 08:35 PM   #2
Cougar4
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I'm not sure if the fan you are saying is working is for the AC system or it is the main fan. You may be able to figure it out by seeing where the condensor is for the A/C system. If the engine coolant temperature was still fairly low then maybe only one fan was needed to be switched on. The relays for the fans are in the main panel under the hood.
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Old 11-29-2008, 09:02 PM   #3
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The two fans (main and sub) are both dual-speed. Under most conditions, for both AC on and normal cooling with AC off, both fans should be running at the same time at either low or high speed. If one of them isn't running at all something is wrong with either the fan itself, the wiring, or the fan relay. Check the fuses too.
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Old 11-29-2008, 09:57 PM   #4
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Thanks, I will check them and report back.
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Old 11-30-2008, 08:20 PM   #5
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So I switched the relays from the sub fan and the AC fan, I just swapped them with one another..both fans are working now. weird.

Perhaps the relay connection was bad??
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Old 11-30-2008, 08:35 PM   #6
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Possibly some dirty/oxidized contacts on the relays themselves or the sockets. Pull them back out and take a careful look.
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Old 12-01-2008, 05:03 PM   #7
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hi, i am having this EXACT problem. Can you direct me to where the relays are??? And which one to switch.

Last edited by WRXDEVIL555; 12-01-2008 at 06:48 PM.
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Old 12-02-2008, 04:41 AM   #8
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The relays are in the main panel under trhe hood. There should be a diagram in the lid to indentify things.
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Old 12-03-2008, 12:01 AM   #9
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I have this problem too same year wrx as well...... the pass sided comes on but rare.
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Old 12-03-2008, 01:20 AM   #10
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Passenger side is the A/C fan. If the driver's fan is not turning on. I would first test for voltage. Then check the resistance of the fan motor.
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Old 12-03-2008, 08:56 AM   #11
mxpunk
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This sunday after I recover from Saturday nights party festivities i am going to go back and inspect this and see whats really going on. I kind of just swapped them and saw that it worked, hooked it back together and said screw it for now, it works

Last edited by mxpunk; 12-03-2008 at 12:10 PM.
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Old 12-03-2008, 12:05 PM   #12
Cougar4
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I suspect the contacts inside the relay are the problem and by moving the relay you made them work again. If this is the case, the relay will go bad again later on at some point.
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Old 12-03-2008, 12:12 PM   #13
mxpunk
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^ perhaps, maybe ill just put them back to where they were and order a new one. anyone got a p/n? since its cold out i suspect i can last a few months but it will def need to be ironed out come spring
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