1G radiator fan won't turn on

[scheides]

It's controlled by the ECU, right?

[Halon]

I believe the stock BCS is 12V that's comes on with the ignition. Not sure how well it can handle a fan though.

I believe the fan is simply controlled by that switch that is threaded into the bottom of the radiator on 1G's. Kyle mentioned something about being able to buy switches that thread in, but switch on at a lower temperature. Have you tried putting in a new switch? That may be worth a shot, and shouldn't take too long to swap in.

Also, just a dumb question, but are you overheating or anything? Do you know that the fan isn't running when it should be running? If it's not even getting up to the correct temperature where it should be turning on at, the fan won't kick on.

And yes, the passenger fan is the MAIN fan.

[Kevin 1G Drummer]

There's a seperate temp sensor for the fans. It's on the lower radiator tank on the left side if you're standing at the front of the car facing the engine. The sensor is probably bad.

[scheides]

Ya the car is def getting up to temp, and even overheating. I'll round up a new switch after I test for voltage coming out of the plug and the a/c thing.

[xveganxcowboyx]

Kevin has got it. There is a temp switch below the main fan. It's a small screw in type near the lower passenger side radiator mount.

I believe the plug for the ac fan is the same. You could plug it into that and keep the ac switch on as a temporary fix. You could also use the AC switch and drivers side fan wiring as a trigger with a relay off the battery. Then it would be controllable and could operate all the time. As an added fail safe, I'm pretty sure the AC fan comes on if the temp gets too high so even if you forgot the switch it would still come on eventually.

*edit* if anyone has a link for the lower temp fan switch I'd love one. I'd prefer it to come on in the 190 - 195 range.

[Matt D.]

Kevin nailed it, I'd check the coolant temp sensor.

[Halon]

Kevin you copy cat!

[Goat Blower]

Wow, 17 posts to figure out a bad coolant temp sensor. Mint. :nod:

[sleepydsm]

Wow, 17 posts to figure out a bad coolant temp sensor. Mint. :nod:

hahahahaha

[turbotalon1g]

Mitsustyle FTW