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Old 03-06-2012, 05:50 PM   #1
ManualOverAuto
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Join Date: Dec 2011
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2001 Impreza L coupe
Sedona red Pearl

Default Overactive fans?

My 01 impreza (2.2) likes to turn the fans on a lot. Sometimes I don't notice it but a lot of times it will even turn them on or I notice them on after as little as 5-10 min of driving.

On one occasion I drove my car for about 10-15 min and the fans weren't on. I turned the car off and was just sitting, listening to music. A few minutes later I turned the key so the lights and ect. were just on, and a few seconds later the fans came on.

This all confuses me because my car Is always at the same operating temp and never has any signs of overheating. Water pump and thermostat were recently done too but the fans did it before too (just not as much I believe).

I guess it's better that they atleast work rather than not work at all.
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Old 03-06-2012, 07:10 PM   #2
Bacon117
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You have the A/C on, or it's on defrost. The A/C will automatically turn on when you have windshield defrost selected. When the A/C is on, the fans are on.
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Old 03-06-2012, 07:45 PM   #3
ManualOverAuto
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Quote:
Originally Posted by Bacon117
You have the A/C on, or it's on defrost. The A/C will automatically turn on when you have windshield defrost selected. When the A/C is on, the fans are on.
No a/c isn't on when it happens (its winter here). And ok the defroster may take some of the blame but other times it just likes to turn on.
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Old 03-07-2012, 12:22 AM   #4
Vrooom_Psh
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Quote:
Originally Posted by ManualOverAuto View Post
No a/c isn't on when it happens (its winter here). And ok the defroster may take some of the blame but other times it just likes to turn on.
Correct me if I'm wrong, but the A/C is ALWAYS on when defrost is selected. (even if the button isn't lit up)
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Old 03-07-2012, 01:22 AM   #5
ManualOverAuto
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Quote:
Originally Posted by Vrooom_Psh View Post
Correct me if I'm wrong, but the A/C is ALWAYS on when defrost is selected. (even if the button isn't lit up)
Maybe.

But it does it even when the heat isnt selected with the defroster on.

Like tonght for example. I leave work and in 5 min the car is a running temp. After another 5 min of driving i turned the car off and sat for a good 10-15 min. I turned the key so my lights and stereo were on. A few seconds later the fans turn on.

The heat and everything was off, and the car wasnt even on. It even sat for a good 10 min.

Idk, either way it doesnt seem to be a problem. I just curious about why it does this. Like i said before its better to have them work when i dont need them too, than not work when i do need them (if that makes sense lol).
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Old 03-07-2012, 02:46 AM   #6
ciper
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Leaving it sit for ten minutes after driving is not a valid test. Heat soak can make the coolant hotter than normal operating conditions.

The defroster can run the AC regardless of the temperature selection.

Find someone with a tactrix cable and do a data log of your coolant temp. See if its running hotter than normal.
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Old 03-07-2012, 03:31 AM   #7
Rally Monkey
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The coolant temp sensor tells the fans when to turn on. Could be you are over observing the situation and things are normal......? The CTS is about $40 and easy to change, it could not hurt to replace it on that car.
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Old 03-07-2012, 03:43 AM   #8
ciper
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Does his car have the three pin combined sensor or one single pin sensor and one two pin sensor? I can't remember when that changed over.
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Old 03-07-2012, 07:47 AM   #9
bluesubie
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Same thing happens on my 2000 RS and the dealer said everything checked out fine. Maybe they're just louder than other fans and I notice them more.

-Dennis
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Old 05-21-2012, 06:12 AM   #10
ManualOverAuto
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Anyone find an explanation and/or fix for this yet? Mine still turn on very frequently. >

I have noticed though, is that they only seem to turn on after idling at a stop, after my car is already warm. Then it seems like after I drive within a mile, the fans go off.
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Old 05-21-2012, 08:31 AM   #11
Bacon117
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As long as the car isn't over heating, it's normal.
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