Boricua944

This started like a day or to ago. I noticed when my battery was dead and had to jump off the car it went dead again and when i hooked up a battery charger to the battery the right fan would jump on. Keys not even it will stay on unless i disconect the battery. my cars an 84 BTW

testarossa_td

You need to replace the switch that is on the radiator. Passenger(US) side(towards bottom) IIRC
You can replace it with a lower temp one that will come on earlier and keep your car cooler. Easy job.

RMills944

^^ listen to him - I had the same issue with my 84

Boricua944

But the car hasn't been cranked in the past day and when i charged up the battery the sucker started goin again.

ibkevin

Yep^^^^^^^^^^^^, pull the fan relay to keep from killing the battery.

RMills944

The fan normally stays on until the temp gets low enough. If the switchis broken, the car always thinks it's too hot and the fan keeps running. Replace the switch and all will be good. Meanwhile, you may want to disconnect the battery negative cable.

Granite 944

I agree with all above. I've had the same problem once myself.

Take a look at Clark's garage, "cooling fan operation"

Good luck!

Boricua944

thanks will order the switch whats the corect name so i make sure to order the right thing.

ahofam123

Its technically a cooling fan switch, but it is commonly referred to as a thermoswitch.

Mighty Shilling

also, check your fan relay...

Keithr726

Does this apply to the 951 to???

jeeper31

with fan running pull plug from thermofan switch. if the fan stops then it is the switch. This just happened to me 2 weeks ago. Take the plug from theswitch and jumper slots 3 and 2 fans should run on low. Jumper 3 and 1 and fans shoudl run on high. If this happends relay is good.

To change the thermofan switch I just took off air cleaner and opened the light to give me more room. Loosened the thermofan switch, got other one ready and swapped them real quickly. Didn't empty radiator and didn't have to bleed it either. Works fine now.

apen749

Hello,

On my 91, the fan turns off with the key but I noticed something unusual today. The power windows work without the key in the ignition. Should this be right?

Thanks, Lee

Robby

Lee- the windows will usually work right after you turn the car off & pull the keys... I read something about working until you open the driver door or something.... not sure how that works- never really thought about it, but I definately can roll my windows up after turning the car off & pulling the key...

Dan- what does "jumper" mean? I've seen this on several electrical threads & am just curious- I'm an electrical idiot, so would appreciate knowing.... I'm about to pull the passenger airbag & the orange control box too- I have to jump two wires together afterwards, or the car will not start- some sort of DME safety or something....

thanks

iloveporsches

Basically, take a wire and short the two connectors. This acts the same as if the thermofan switch were to close and make a circuit.