Fans continually running

Re: Fans continually running (TIPSIDUECE)

Thu, 05 Sep 2013 22:44:14 GMT

cheers mate

Re: Fans continually running (twomr2`s)

Thu, 05 Sep 2013 18:47:26 GMT

A/C amp is behind the glovebox,mounted to the evap unit.
note the 93 model amps are different to 90/91 model,and ive read that toyota made a mistake when printing the 93 bgb for the A/C amp,they just copied the 91 bgb and didnt change the wire allocations for the changes made (for 93)

pressure switch is on the rhs of the front trunk,(black one with two wire plug coming off it)

Re: Fans continually running (TIPSIDUECE)

Thu, 05 Sep 2013 17:31:29 GMT

i have the same situation with the fans always on, have checked evrything else except a/c pressure switch and a/c amplifier. can sumone please post a photo of the location of pressure switch and amplifier? cheers

Re: Fans continually running (twomr2`s)

Wed, 04 Sep 2013 23:21:00 GMT

if it helps anyone else,i just added the system outline to my last post.

just to confirm with the OP the year of the car and also;

-you have run a wire from one side to the other on the h/p switch Plug(like cruiser said,and in the link you posted) and still nothing/wont turn off?

-you have no A/C compressor fitted/gassed

-have you checked the A/C amp?-pull it out of the little black box and see if its melted on the circuit board anywhere

-all relays are working correctly

cheers

Re: Fans continually running (Mrtsu)

Wed, 04 Sep 2013 14:51:23 GMT

Good Info twomr2's

Yep have bridged out all sensors already as whoever did the timing belt previously had taken out the ac compressor but fans were still running

Terminal 10 on the ac amplifier having 12v instead of an earth is about the only thing I can see an issue with

Re: Fans continually running (twomr2`s)

Wed, 04 Sep 2013 02:58:42 GMT

not sure what year,but this might help

system outline added 4/9

Re: Fans continually running (Cruiser97_80)

Wed, 04 Sep 2013 01:30:24 GMT

A/C pressure switch in the frunk near the fire wall (l/h side) will cause the fans to run all the time, if it's disconnected or faulty.
I had this problem after removing all my a/c stuff. I had to bridge the connector that plugged into the a/c pressure switch to fix it.

Re: Fans continually running (Mrtsu)

Mon, 02 Sep 2013 22:59:35 GMT

Nope I'm going to order 1 and check if it fixes it will keep you posted

Re: Fans continually running (GT-FourRC)

Mon, 02 Sep 2013 22:26:35 GMT

Any update? I have the same issue.. been like this for ages..

thanks

Re: Fans continually running (Mrtsu)

Tue, 27 Aug 2013 17:40:39 GMT

Can anyone confirm this?

Re: Fans continually running (Mrtsu)

Fri, 23 Aug 2013 18:16:24 GMT

Yeah sorry about that, just used to having all the info, basically the coil side of fan relay 2 and 3 get ignition power and then go to the ac pressure switch and then to pin 10 of the ac amplifier which by rights should be earthed by the ac amplifier to turn the fans off

Re: Fans continually running (MIDN1T3)

Fri, 23 Aug 2013 18:05:38 GMT

Not sure about your above question but i had the same issue -fans running all the time - and it turned out to be a faulty amplifier.

Re: Fans continually running (Mrtsu)

Fri, 23 Aug 2013 16:39:08 GMT

Finally got around to checking the sensor in the radiator, bridged it out and fans still running, so back to terminal 10 on the ac amplifier, what I did was unplug the ac switch and then earth the wire comming from the relay to it cause the fan relays to ground, is this an indication of the amplifier transistors fried?

Re: Fans continually running (Mrtsu)

Thu, 22 Aug 2013 07:52:06 GMT

Ok will check this afternoon, thanks all for the info

Re: Fans continually running (Gatesys SW20)

Thu, 22 Aug 2013 07:02:05 GMT

redtarga. yeah sorry my bad,

yeah there should be a sensor in your radiator, crawl under the car and its on the insed of the radiator so you have to be looking at the back of the rad, sand youll see a sensor with a round plug i think going to it, mine was unplugged due to the bad bleeding of my system, they will always run also if you have incorrectly bled the cooling system, as it will trap a pocket of air,
stat with small stuff, check the sensor is plugged in and good,
then re bleed system corrrectly!

then go from there, :)