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Old 07-06-2006, 04:02 PM   #1
DubyaAreEcks
Scooby Newbie
 
Member#: 82568
Join Date: Mar 2005
Chapter/Region: MAIC
Location: Land of the Free
Vehicle:
2004 Impretzer WRX
Chipped Hood Scoop Blue

Default Fan relays?

I have a problem with the fan blower. Over the weekend the fan was acting up towards the end of 3+ hours of driving with the AC on. I felt is wasn't putting out the proper CFM (?) on the lower speeds. It almost seemed like there was some resistance since I could turn it up to high, drop it back down, and it appeared to work correctly. Late in the day, I smelled a burning smell for a brief period (few seconds) when coming to a light. The next day, after firing up the engine, very little air came through the vents untill I ran it on high. It did seem to work normally after this. I think the next day, only high would work.

After describing the problem to a friend, he guessed that the relays eventually burned out.

It now only high works with no airflow on the 1-3 speeds. I have a few thousand miles left under warrantly thankfully so I will be taking this in. The AC system seems to work fine. I havenot tried the heat.

Any ideas, or has anyone has this problem before?
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Old 07-06-2006, 04:25 PM   #2
Mulder
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Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

Default

You'll find your answer here-
http://forums.nasioc.com/forums/showthread.php?t=791084
Check for anything blocking the HVAC ducts that could reduce airflow, if the resistor doesn't have sufficient air flowing past it, it can overheat and burn out. Also make sure the fan itself is ok and spins freely.
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Old 07-07-2006, 01:28 AM   #3
Alan
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Member#: 3601
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Tigard, Oregon
Vehicle:
2006 WRX Wagon
BRIGHT BLUE!

Default

And as a guess, the fan resistor is probably cooled by the airflow in the heater box. When the cooling coils ice up, after prolonged A/C operation in fairly humid conditions, the airflow is blocked, the resistor overheats and burns out. The way to avoid this is to shut off the A/C and let the coils defrost if the airflow gets blocked after using the A/C for a while. Also be sure the cabin air filter is cleaned or replaced yearly, or if the heater airflow seems reduced.
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