Small fans stay on all the time when the ign is in on position

[K3vdaw6]

Hi all!
The 2 small electric fans on the drivers side of my rad stay on all the time when the ignition is in on position. Even if i havent driven it for a few days as soon as i put the key in and turn it they turn on and stay on until i turn the key off. It just started doing this a couple weeks ago. Hoping someone has had this issue befor and can point me in the right direction. Thanks

 

[Nick M]

Can you read a wiring diagram? I ask because many say they can't.

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=144

A/C high pressure switch could be closed electrically, or the water temp switch number 2 could be closed electrically. When closed the relay is activated that turns on the fans. A direct ground from bad wiring will do the same thing.

 

[K3vdaw6]

Ya i can read it. Its just finding them under the hood lol. Thanks. The ac system is comin out at some point anyway. Just sick of the fan noise

 

[Nick M]

The high pressure switch is on the top side of the passenger wheel well. There are A/C lines on that side with the charge air piping hiding them. That is near the bottom of the canister.

 

[K3vdaw6]

Is there a way to bypass the high pressure switch? My ac doesnt work and as far as i can tell theres no refrigerant in the system. It hasnt worked since i bought it. Im gonna rip the ac out of it anyway

 

[K3vdaw6]

SUCCESS!!!! Followed your directions on wherr to find the hp switch. Had the car running, fans spinning away. I just touched the wires coming out of the hp switch and the fans stopped. Now just have to repair the wire or remove the connector or bypass the switch. I wonder if i can just unplug it

 

[Nick M]

Is there a way to bypass the high pressure switch?

Unplug it.

 

[gtsfirefighter]

If your thermostat housing looks like this then try unplugging the middle sensor (the one with white tape in the picture). Mine is bulging out and sometimes the fan comes on and unplugging that turns it off. New sensor on the way.


Sent from my iPhone using Tapatalk

 

[Nick M]

If I spent some time on google, I would have that water switch replaced one that comes on at 215 and off at 200. It might be in the TCCS thread where the temps are listed, but I know it is a safety switch, not a control. I would have it as a redundant control with the fan clutch. For now, I turn mine on whenever I please.