temp controled elec fan q.

[mazzer]

im siwtching to elec fan but dont want it to run constantly.i was looking at a wiring dia. and found the one-wire switch that powers the high pres./ a/c fans so i want to use that as my relay ground. my question is, does anyone know what temp is required for that switch to ground?

 

[mrnickleye]

Don't use that, as it only works when the a/c is on. You can get a 'fixed' or adjustable thermostat kit that will power your new fan. They are about $50. You should also put a switch inside to ground the relay when you want to keep fan on. I put mine in one of the coin holder slots on the left of dash.

 

[bluemax]

I'm with mrnickleye,
But I used a power lead to the fan(s) so if my thermostat controller fails I will be able to manually run power to the fans. Use good gauge wire and a switch rated for a minimum amount of current your fans are rated for.
I also use the manual switch to turn on the fans when I think the car is going to get hot.

 

[IHI-RHC7]

Uhm, the AC switch is perfect to use.
It has nothing to do with the AC.
THe Temp switch he is refering to is the single pole on the thermo housing, and it grounds at 160-170 deg F. If you want it to run at a different temp then you can purchase different temperature switches from an auto parts store.

 

[suprabad]

Even simpler...do as I did and wire one fan to the hot side of the ignition so it runs when ever the ignition is in the on position and run your other fan to an inside switch that you can turn on and off when necessary. Above all fuse everything. Yes I read what you wrote about not wanting to run the fan all the time, but consider this:
1. Your never gonna run this car for any length of time w/o the fan
2. A thermo switch is just one more thing to go wrong
3. If the thermo switch does fail (and eventually it will) you'll probably trash your headgasket (or worse) before you notice the spiked temp gauge.
Just food for thought...good luck

 

[IHI-RHC7]

My thermo switch has worked flawlessly for the last 18 years...
You know, the turbo will fail eventually too, you better yank that off and go high compression so you don't have to worry about that failing, and possibly fouling spark plugs....

 

[mrnickleye]

Everything fails sometime (musical notes here). That's how I've made a good $ living for, well, all my life. My saying is : "If man made it, its goona break down".
Just go with "whatever floats yer boat".

 

[bluemax]

My thermo switch has also never failed. But I feel more in control if I have a manual back up.
I've adjusted the temperature several times to find what suits me.
Ohhh..... those thermo switches for the electric fans are adjustable with a turn of a knob. How cool...........
You can buy the thermo switch with the fan. I did.

But seriously, you probably don't want to run a power hungry fan, or in my case, dual fans, all the time. Especially when you don't need the fans on 90% of the time. The only time you'll need the fans are when you are in stop and go traffic. It defeats the purpose of getting an electric fan if you're going to run it all the time. But I guess it depends on your driving situation.

 

[IHI-RHC7]

Agreed. The AC fan uses the temp switch on the thermostat neck to turn on the auxiliary fans when the ac is on, AND when the temp is over 160-170.
If you use this ground for a simple relay to control your fan Then the fan will turn on only when the temperature reaches 165 degrees or so. I have not tested my switch to find the exact operating temperature, but I do know that it is a happy temp for the 7m to run at and it is a prime way to have your fans turn on when they are needed. Also by hooking up a fused direct power source to the relay, the fan will cycle on and off until all of the coolant is below 160 degrees, reguardless of ignition switch position.
That way, even after your turbo timer has cooled off the oil, your fan will continue to cool the coolant until... well until its cool.

 

[supraman7mgte]

oh,your constant arguing is tearing this family apart...
anyway,i have the Perma Cool fan sensor kit in my car using a relay to flick on the fans,but i also have a manual override just in case the automatic switch fails

 

[IHI-RHC7]

I love you guys!
I just say that the switch is there from the factory, it's free, and it was DESIGNED to turn electric fans on and off.
Why not use it?

 

[mazzer]

thank you guys. sure its a good idea. thats why i thought of it :biglaugh:. but seriously,160 degrees,sounds great.cant wait to toss that man. fan aside.

 

[IHI-RHC7]

Mazzer, Love the gracier front fascia with the Turbo A duct. What color paint is that?

 

[supra90turbo]

i have my fans wired to the a/c fans stock wiring.
and it worked better than the stupid Flex A Lite controller the fans came with... i hate that thing...

 

[IHI-RHC7]

Yeah, not to mention, it's expensive!!!!
Although, if you use only the stock wiring, and no constant power to a relay, then the fans will only work when the ac is on...

 

[mazzer]

Mazzer, Love the gracier front fascia with the Turbo A duct. What color paint is that?

ty. the paint is stock. mystic silver(?) i think is the color

 

[Shawndude]

The A/C fan switch turns on at 212 F and off at 203 F.

http://www.cygnusx1.net/supra/library/TSRM/ac/AC_33.html

 

[supraman7mgte]

The A/C fan switch turns on at 212 F and off at 203 F.

http://www.cygnusx1.net/supra/library/TSRM/ac/AC_33.html

thats way above the 180 degree thermostat.not (ha ha) cool

 

[Shawndude]

thats way above the 180 degree thermostat.not (ha ha) cool

The stock thermostat stays closed until 190F. It doesn't fully open until 212F.

Just pointing out that the thermo-switch does not engage at 160F, like some think it does.

 

[mazzer]

i see..this is the info i was looking for.