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Old 05-02-2012, 10:04 PM   #1
sedonarex13
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Default 03 wrx fans not kicking on

03 wrx just did timing belt, water pump install put in new thermostat.... dont think the fans have kicked on since install and top radiator hose is realy hard like full of pressure when warm.. should it have that much pressure build up. the temp gauge stays at normal reading but ap says temp is around 185
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Old 05-02-2012, 10:16 PM   #2
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185 is actually running cool for coolant temp. I don't think anything is wrong, because if the fans weren't working/system not working you would be over heating. Did you make sure to plug in the plugs completely?
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Old 05-02-2012, 10:26 PM   #3
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Run the car at idle for a while and monitor the temp gauge. If they aren't working temp gauge will creep to red. Pop the hood and see if they turn on. They will run then turn off. I believe they'll also turn on when a/c is on. Check fan fuse and connections
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Old 05-02-2012, 10:28 PM   #4
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Kick the AC on, if the fans still don't spin then you may have an issue. I replaced a radiator and had the same thing, no fans but I wasn't running hot. Thumbed through the manual and found that the fans will not spin (under normal conditions) without the AC on.
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Old 05-02-2012, 10:43 PM   #5
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Not sure this is possible in a wrx but can you replace thermostat upside down? I know in older cars it was possible. In such case the themo wouldn't open up
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Old 05-02-2012, 10:44 PM   #6
sedonarex13
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yea the fans are plugged up it was a 170 thermostat that i put in
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Old 05-02-2012, 10:46 PM   #7
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Quote:
Originally Posted by Thunderpaw View Post
Not sure this is possible in a wrx but can you replace thermostat upside down? I know in older cars it was possible. In such case the themo wouldn't open up
pretty sure it will only go in one way i mad sure it was in there right tho
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Old 05-02-2012, 10:51 PM   #8
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There is a small relief on the top of the thermostat that should be positioned at 12 o clock in case of a fail. But that won't affect the car during normal operation.
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Old 05-03-2012, 01:15 PM   #9
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If the thermostat is a 170, the car may be cooling itself well enough without the fans running, so that the fan switch never sees temps high enough to turn them on.

Usually I would suggest to make sure the system is well bled, but if there are air bubbles it would usually get to a high temp quickyl, and then if the fans weren't coming on it would be a concern.

Since this isn't an old V8 that will make some more power when cooler, why did you go a lower temp thermostat? On a modern fuel injection car like this, you may not even be running in the right temp range for the ecu to be truely happy, and if the car still thinks that it is warming up, it will be dumping excess fuel in, actually wasting gas and making the car run rich i.e. slower.
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Old 05-06-2012, 10:20 PM   #10
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i honestly just went to a parts store and got the first thermostat they gave me but after letting the car sit for 2 days i pulled the radiator cap off and quite a bit of coolant came out
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Old 05-06-2012, 10:25 PM   #11
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Quote:
Originally Posted by sedonarex13 View Post
i honestly just went to a parts store and got the first thermostat they gave me but after letting the car sit for 2 days i pulled the radiator cap off and quite a bit of coolant came out
Thats more of a sign of overfilling the system. A themrostat shouldn't make more coolant come out of anything.
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Old 05-06-2012, 10:51 PM   #12
sedonarex13
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Quote:
Originally Posted by HinshawWRX View Post
Thats more of a sign of overfilling the system. A themrostat shouldn't make more coolant come out of anything.
your right but an air pocket would make it do that could it not?
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Old 05-06-2012, 10:53 PM   #13
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Quote:
Originally Posted by ThaGriff View Post
Kick the AC on, if the fans still don't spin then you may have an issue. I replaced a radiator and had the same thing, no fans but I wasn't running hot. Thumbed through the manual and found that the fans will not spin (under normal conditions) without the AC on.
i have no a/c it has been deleted
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Old 04-23-2013, 12:08 PM   #14
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Bumping an old thread.

Sedonarex13 did you ever resolve this issue? I'm having the exact same problem. I've recently replaced the same parts. Fan's won't kick on and I have deleted the A/C system as well. Please update.
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Old 04-23-2013, 10:51 PM   #15
sedonarex13
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The car was just never getting hot enough for them to come on i put a oem thermostat in and all was good. The fans would kick on around 208 be sure and check your fuses there should be one for each fan.
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Old 04-23-2013, 11:02 PM   #16
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Run the car at idle for a while and monitor the temp gauge.
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Old 04-24-2013, 05:54 AM   #17
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Quote:
Originally Posted by sedonarex13 View Post
03 wrx just did timing belt, water pump install put in new thermostat.... dont think the fans have kicked on since install and top radiator hose is realy hard like full of pressure when warm.. should it have that much pressure build up. the temp gauge stays at normal reading but ap says temp is around 185
Hell, my car runs at 195-205. The fans only kick on around 198-200.
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Old 04-24-2013, 07:54 AM   #18
sedonarex13
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Thats about right
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Old 04-24-2013, 12:59 PM   #19
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Thanks, I'll go with an OEM thermostat then. I have one from Autozone...
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Old 04-24-2013, 02:06 PM   #20
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Quote:
Originally Posted by sedonarex13 View Post
i have no a/c it has been deleted
That will be enjoyable for summer in NC, hope the 06 is your dd.
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Old 04-25-2013, 06:45 PM   #21
sedonarex13
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Yea haha i sold that car my 06 is my only suby, hell it dosnt get that hot were im from, plus im used to it ive only owned one car that had ac
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