Thread: Twin Aircon Condensor Fans

Originally Posted by Davo

I was wondering how these two fans are supposed to work. It's an '83 3.5 auto Rangie. When the engine is running, with or without the aircon, both fans are turning, the RH one slowly, and the LH one even slower. Obviously they're stuffed or there's something wrong with the supply voltage.

But are they supposed to run only with the aircon? Does one come on first and then the other? And it doesn't help that someone's really monkeyed with the aircon and electrics so now I can't easily tell what to return the system to.

Likely they are just freewheeling in the breeze from the main fan. Get back to basics and find the wires to the fans. Temporarily apply battery voltage to the fans to see if they go then get the wiring sorted. They should only work with the a/c or a thermostatic switch fitted to the top of the rad or engine.

Ooer, yes, why didn't I think of that? I did test them and of course they work and were indeed moving before from the engine fan. I haven't found out why they're not working yet but even if I do I might wire them with another switch or with a timer, (if I can ever find one), as they would be a handy way to cool things down after the engine is switched off.

Thanks again!

For some reason the red/black supply wire for the fan relay was disconnected from the battery and its end taped up. Ergh, the whole car's like this.

Now that it's reconnected, even though the switch labelled "Off Temp Cold" is missing, turning on the fan switch energises the compressor clutch and the fans come on and everything seems to work, which seems about right. So I guess I'll leave it. Though there has been some other funny wiring on the aircon system. Hoo-boy.