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Old 01-12-2009, 11:58 PM   #1
DC16A2
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Default Radiator fans run excessively.

The radiator fans seem to be running excessively these days, even though in this weather it never goes above 40F and it's often around 20F when I start driving. The fans come on during idle more, and when I'm parked, they stay on for minutes at a time. They never used to do this -before, they would switch on and off every few minutes, and that included in the summer.

Is it the thermostat, radiator blockage, or something else acting up?

Any help would be appreciated =)
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Old 01-13-2009, 09:41 AM   #2
surowrxa
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Has your coolant temp reading changed at all during any of this extra activity?

Has your cold coolant overflow level been stable?
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Old 01-13-2009, 10:04 AM   #3
wrxdrvr
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Have you put the defrost to full defrost? The AC comes on and the fans will run...
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Old 01-13-2009, 11:29 AM   #4
rkramer
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Quote:
Originally Posted by wrxdrvr View Post
Have you put the defrost to full defrost? The AC comes on and the fans will run...
full or even the floor/defrost mix will turn on the fans.
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Old 01-14-2009, 10:01 AM   #5
DC16A2
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Ahhh, leave it to my northern neighbors to points out the defrost/fan link =)

I think you guys may be right.. the coolant levels and overflow have been normal. Also, I will try driving with absolutely no heater/AC use and those with to test this out the fan.

Thanks guys!
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Old 01-26-2009, 12:15 PM   #6
mrjoshm
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how does the defrost thing work if the A/C system is empty and the clutch never engages? or if the A/C is stripped from the car?
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Old 01-26-2009, 06:50 PM   #7
yarrgh
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it doesn't, it just sends air at the windshield. There are probably some electrical contacts in there somewhere that turn on the AC. If it doesn't exist, no big deal. if it turns on the compressor and there's no refrigerant, too bad.
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Old 01-26-2009, 11:49 PM   #8
DC16A2
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Okay, so after two weeks of careful observation: no use of any AC/heat and the radiator fans still come on excessively -I wait more than 5 minutes for them to turn off and they still keep going. I'm doing normal suburban driving, and the coolant temps range 194F to 204F. Coolant itself is OEM from dealer and less than a year old.

Perhaps I should get a new OEM thermostat?
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Old 01-27-2009, 01:57 AM   #9
Bacon117
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if your coolant temps are good (i assume you have an after market guage), the thermostat is probably ok. coolant temp sending unit might be bad. grab a chiltons or haynes manual from your local parts store, it will tell you how to change the sending unit.
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Old 01-27-2009, 12:23 PM   #10
DC16A2
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^Thanks! It seems like that there's a lack of Chilton/Haynes manuals for our cars.. but I'll look into this "sending unit." My "aftermarket gauge" is just a ScanGuage2 grabbing values from the ECU.
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Old 01-27-2009, 12:33 PM   #11
mrjoshm
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i just checked last night at an ambient temp of about 15F with my AP and my fans kicked on at idle at 205/206F and i watched at it cooled the car to 203F then turned it off cause it was taking forever. so with the a/c stripped from the car, it just blows hot air at the windshield...maybe i'll rewire the a/c button to do something cool like i/c water spray or open a downpipe cut-out
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Old 05-19-2009, 01:43 PM   #12
DC16A2
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Strangely, my radiator fans are now cycling normally. They kick in at 204F, blow for about 30 seconds, and shut off when the water temp dips to 193F.
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Old 12-17-2009, 03:32 PM   #13
controler
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I'm having the same problem. Temp gauge doesn't move below just half way and the fans are coming on in the cold temps <40 degrees. With or without the heat/defrost being on. No check engine lights either. I replaced the radiator in August with one from Napa and coolant from subaru. No coolant leaks either. 92k miles, stage 2.

What was the fix?
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