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Old 09-06-2003, 03:50 PM   #1
Scooby Newbie
Member#: 42967
Join Date: Sep 2003
Chapter/Region: NWIC
Location: Portland, OR
2003 WRX Sedan
Aspen White

Exclamation Engine Runs too Hot at Idle

Should my engine/radiator fans run all the time? If not when should the turn on? I was waiting at a train crossing today at idle for about ten minutes and my cars temp kept rising and rising way too high. when I started to drive it went down obviously because air was getting to the radiator. Further investigation I found that the fans are not running. I have checked the fuses and they are fine. when I turn the cars ignition to the on position (not starting it) the fan clicks on and then clicks off. Please Advise

I just did another test. I started the car no fan, I turned on the A/C Fan went on and then turned off in about 1 minute. saw the the A/C pully switch to off in the engine no cool air inside the car (which I have noticed since I've had the car.
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Old 09-06-2003, 07:44 PM   #2
Scooby Newbie
Member#: 19848
Join Date: Jun 2002
Location: NW CT
2002 WRX Wagon


I'm guessing that there has to be a previous thread that describes the way the WRX fans work, so your quickest path would probably be to do a search. Or, you could go to the online manuals (Subaru Technical Information service) and download the appropriate manual / page. I have a 2002 WRX and my copy of Volume 8 (Mechanism and function) has the information on page CO-12.

For the 2002 WRX . . . The ECU uses signals from the engine coolant temperature sensor, vehicle speed sensor, and A/C switch. It then decides, based on a combination of the inputs, whether or not to run the main fan and/or sub-fan, and what fan speeds should be used. I can't guarantee the information would be accurate, but you can PM me if you have some specific questions and I'll tell you what the book says. I can tell you this (for the 2002 anyway): If you are under 12 mph (including a dead stop) and you have your A/C off, both fans are supposed to be off unless your coolant temperature is above 96 C. At 96 C and above, both fans should run at low speed.
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Old 09-07-2003, 03:12 AM   #3
Scooby Guru
Member#: 7089
Join Date: May 2001
Chapter/Region: NWIC
Location: Western Wa
2016 STi


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