hey i just installed two slim line fans to replace my stock radiator and ac fans. I was wondering which wires were which when looking at the plugs that the stock fans plugged into? there is a yellow/red wire and black/blue wire on one, and a black wire and black/blue wire on the other. how would i go about wiring the new fans to the stock fan plugs? thanks.

 

Do not trust the wiring color!!! the and easiest way to test this is it "dummy" connect your fan wiring and turn the ac while car is running. Then check and feel/see on if the fans are pulling air "into" the engine bay or pushing air "from" the engine bay. You'll need it set to be pulling air "into" the engine bay

 

Im just waiting till mine is all set to go and then turning the car on and checking where its supposed to go. Then switching if needed.

Now, if you dont have AC then wire them both to come on when engine temp gets high. Im worried that my one flex a lite may not handle mine but we will see.

 

ok. i set them both up as pushers to give me more room in the engine bay. i will cut the stock plug off the wiring and hard wire the new fans to it and see which way it blows. thanks all.

 

My 88 Rx7 had a viscous clutch fan that overpowered the sound of the engine, so I replace it with a single 16" universal fan from Hayden. I had to make my own wiring harness, but it was pretty simple. They sell a temperature switch that is fully adjustable, and using 2 relays you can power the fan with no problem. One for the temperature switch, and one for the A/C so you don't backpower the A/C when the temperature switch closes.

If you're wanting to use the stock fan wiring, I'd still suggest using a relay if you don't know how much current the new fan draws compared to the stock. There's a 20A fuse for the condenser motor, and a 30A for the radiator fan. The wires that go to the radiator fan are black/blue (power from relay) and black (ground) The ones that go to the AC fan are yellow/red (power) and black/blue (grounded through relay) Use an ammeter to determine how much starting current the fan will draw, so you can verify that the fuse won't blow, and you won't overpower your stock relay and wiring harness.