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The mkiv Supra Owners Club

rad fan


antno

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any one know when the twin aux fan came in? i have a 96 tt6 jspec and im having issues with the fan.

 

also does anyone have a copy of the electrical circuits workshop manual for a car with single aux fan i only have the 1995 and 97 copies and both have twin fans?

 

cheers antno

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any one know when the twin aux fan came in? i have a 96 tt6 jspec and im having issues with the fan.

 

also does anyone have a copy of the electrical circuits workshop manual for a car with single aux fan i only have the 1995 and 97 copies and both have twin fans?

 

cheers antno

 

Are we talking about the small fans in the cowl? The relays for this are underneath the passenger headlight and are wired so the relay is pulled when the ignition is on and the fan not running, ie it uses the NC contacts. When the circuit to the relay coil is broken the relay un energises and the contacts close, bringing in the fan. The sensor at the bottom of the rad is wired with another sensor in the ac and either sensor can cause the fan to start (or not). If you unplug ther sensor on the bottom of the rad, the fan should kick in if all else is ok.

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Ye the small fan in the cowl. I've tested the sensor and checked the relay. It was operating opposite to the two workshop manuals I had but it turns out they are both for the twin fan set up. I bought a new one from mr t and it was the same. I need to find the ac switch and remove it as I have removed my aircon. Do you know where it is under the bonnet pal?

 

Cheers antno

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Ye the small fan in the cowl. I've tested the sensor and checked the relay. It was operating opposite to the two workshop manuals I had but it turns out they are both for the twin fan set up. I bought a new one from mr t and it was the same. I need to find the ac switch and remove it as I have removed my aircon. Do you know where it is under the bonnet pal?

find

Cheers antno

No, luckily I never had to get that far with mine! If you look at that part of the circuitry in the workshop manual on here, you will see it is only a two wire device so cant be that hard to find. I am off work tomorrow and if I get chance I will have a look to see if I can find it. So is your fan running all the time then? The very way the circuit is designed is to bring the fan(s) running should either of the sensors fail.

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Ye running all the time. Only noticed it after I removed the aircon. I'm going to start tracing the wires back from the relay and find the ac switch. I'm going to have a look into it later this week

 

Cheers pal

 

OK sounds good, once you have found where the AC sensor connector is/was then just join up the cables and the fans should stop until the sensor at the bottom of the rad either opens under its own steam(no pun intended) or you unplug it.

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  • 3 months later...

It's been a while since I had chance to look at the fan situation. But basically the ac pressure switch that also controls the aux fan is located up by the abs pump. It goes in to the air con line and on the 2jzgte it has four wires. If you join the wires numbered 2+3 the fan will only be controlled by the rad temp sensor.

 

The workshop manual was right in the end I thought the wiring diagram had been taken from a facelift car plus the other relay has abs written on it and this also controls trac and the rad fan.

 

Anyway nice to get things sorted in the end.

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It's been a while since I had chance to look at the fan situation. But basically the ac pressure switch that also controls the aux fan is located up by the abs pump. It goes in to the air con line and on the 2jzgte it has four wires. If you join the wires numbered 2+3 the fan will only be controlled by the rad temp sensor.

 

The workshop manual was right in the end I thought the wiring diagram had been taken from a facelift car plus the other relay has abs written on it and this also controls trac and the rad fan.

 

Anyway nice to get things sorted in the end.

 

Crikey...forgot about this one! Excellent, its the normally closed contacts that throws people with the fan wiring. Well done for getting it sorted and posting the results.

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