radiator fan running

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radiator fan running

Postby Smaay » Sat Mar 14, 2015 3:34 am

well I got Amy's car back up and running (kinda) as soon as I put the key in the ON postion, the fan comes on. im also getting a code for coolant temp sensor. do I have the plugs backwards on the water neck?
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Re: radiator fan running

Postby RedCelicaTRD » Sat Mar 14, 2015 5:28 am

I know on my harness the plugs do not match the sensor color, they are backwards. The fan issue could also be the fan switch in the bottom of the radiator. When they fail the fan is always on.
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Re: radiator fan running

Postby underscore » Sat Mar 14, 2015 2:33 pm

The switch for the fan is in the rad, not the coolant neck (it's on the bottom, make sure one of the wires isn't broken right at the plug like mine was). The two in the coolant neck shouldn't be able to be backwards as the plugs are different.
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Re: radiator fan running

Postby Smaay » Sun Mar 15, 2015 2:52 am

ok so if its the switch at the bottom of the radiator, how do it check it? is it a simple ohms check on the sensor?
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Re: radiator fan running

Postby FC Zach » Sun Mar 15, 2015 3:35 am

Also if your ac pressure switch is not connected, the fan will run.
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Re: radiator fan running

Postby Smaay » Sun Mar 15, 2015 3:39 am

yeah i knew that, its plugged in, when i unplug it, i can hear relays clicking.
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Re: radiator fan running

Postby underscore » Sun Mar 15, 2015 5:21 am

It's an open/closed switch, it should open when it gets hot
Last edited by underscore on Sun Mar 15, 2015 5:33 pm, edited 1 time in total.
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Re: radiator fan running

Postby RedCelicaTRD » Sun Mar 15, 2015 3:22 pm

I believe it opens when it gets hot. This is why the fan turns on when you unplug it or the AC switch.
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Re: radiator fan running

Postby underscore » Sun Mar 15, 2015 5:32 pm

Sorry, you're right, I got it backwards.
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Re: radiator fan running

Postby Smaay » Thu Mar 19, 2015 2:31 pm

checked the switch, it has continuity through the pins so i know its closed. havent checked the AC switch yet.

what else can it be?
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Re: radiator fan running

Postby warracer » Thu Mar 19, 2015 2:53 pm

Probably the AC switch at this point . Mine failed and the fan was on 100% of the time, I deleted the AC and now my fan runs all the time. I don`t really mind since these engines tend to run hot anyway. You could add a manual switch inside but there`s always the risk of forgeting about it and letting the car over heat. I`ve been driving the car with the fan always on for the past 2 years, not a single issue, in the winter when its -25C or colder the engine doesn`t run at the prefered thermostat temp but I still have heat and the afr is steady 14.7 so it doesn`t run lean or rich.
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Re: radiator fan running

Postby Smaay » Wed Apr 01, 2015 4:21 am

id rather not have the fans running all the time. ill try to figure it out
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Re: radiator fan running

Postby mx6er2587 » Wed Apr 01, 2015 1:30 pm

you could always just wire a universal controller if you can't get the factory one working

for example: http://www.summitracing.com/parts/der-16749/overview/
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Re: radiator fan running

Postby Corey » Wed Apr 01, 2015 9:44 pm

warracer wrote:Probably the AC switch at this point . Mine failed and the fan was on 100% of the time, I deleted the AC and now my fan runs all the time. I don`t really mind since these engines tend to run hot anyway. You could add a manual switch inside but there`s always the risk of forgeting about it and letting the car over heat. I`ve been driving the car with the fan always on for the past 2 years, not a single issue, in the winter when its -25C or colder the engine doesn`t run at the prefered thermostat temp but I still have heat and the afr is steady 14.7 so it doesn`t run lean or rich.


Check out www.gtfours.co.uk for a how-to on deleting the a/c and modifying the a/c pressure switch so the rad fan doesn't run constantly. I think i just left mine plugged in when I deleted my a/c.
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