I'm hoping you guys can help. I need to wire up a pair of pro fans to replace the STD subaru ones. The new fans are nice and easy as they are on two pin plugs with a positive and a negative. The STD fans are three pin with two positive and one negative. I have read waht i can find and As I understand the STD fans are twin speed and and the speed is determined by wich 1 of the 2 positive pins are live. The car is unfinished so i can't run the engine and use a multimeter to work out wich is the slow speed pin and wich is the fast pin.

This is were you guys come in, do you know wich pin i would use to switch a realy on to run the pair of new fans on. I would like them to come on when you would normaly have the slow speed fan on so they are working at the firts point you would need cooling. It whould also be nice if the pin i need is the same one that is triggered when you swich the AC on. The car dose not have the AC pump conected but it would act as a manul swich for if you were stuck in slow moveing trafic and the likes.

The car is a 93 WRX and has AC with twin fans.

Thanks in advance

 

Any one???

 

How about using an external battery or a powersupply

should tell you which runs faster and slower

cheers

 

That wont help me mate, i need to know wich 1 of the 3 pins becomes live when you would normaly have the rad fans on their slow speed mode.

Thanks any way

 

I am hopeing to wire these up tomorow so if any one can help it would be greatly appreciated.

 

when you put the aircon on don't the fans come on too? Also if you do an ecu reset don't then come on as well??

 

This may well be the case mate and would be ideal but i have no way of powering up the car as the in no batt on it and 1/2 the loom is unpluged as the car is not finished. I guess what im asking is if any one has put pro fans on and how it was done.

Thanks for your reply Fizz

 

The 3 pin std plug has a ground wire (middle one) and 2 switched 12v feeds. For low speed only one of the 2 switched feeds ist turned on, and for high speed they are both switched on. The early cars never actually used the dual speed fan function anyway, so the fan was either fully on or fully off.

For atermarket fans, you should be able to just use the middle pin and one of the outside pins.

Paul

 

Cheers Paul, helps alot.

Should have my firts dive of one of your PPG boxs next week and looking forward to it.