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1G How do I wire the radiator fan to come on when I push the AC button

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dsmdeliveryboy

15+ Year Contributor
2,054
5
Aug 14, 2007
Medford, Oregon
I've heard of this but don't want to start hacking stuff up until I know exactly what it involves. I heard vfaq used to have a write-up on it and there is one for a 2g but I can't seem to find one for a 1g...
 
Wire it to the A/C connector. 2 ground connections and 2 power connections. Pull out a multimeter and test the wires.
 
Is this for your main fan?

Or are you just wiring in an extra fan, just to keep temps down with a flick of a switch when your main fan can't keep your temps down?

Or are you keeping a/c, and just want to know how to wire in a slim fan, to work like stock?

Or, are you just wiring in fans to turn on with your a/c switch, in which case you will be monitoring your temps manually?
 
My bad here ya go

1st pic - there will be power to the item (here a light bulb) if a/c button is both yellow/green
2nd pic - there will be power to the item (here a light bulb) if a/c button is only green

Note: this is only for 90-96 models as the button was no longer a two step (ie removed the yellow stage) for the 97-99
 

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I'm trying to wire my main fan to come on when I push the AC button. I noticed yesterday when going to do it though that it only comes on when I turn the blower switch on and I'd like to keep the blower still for vent air as its better than not having any AC at all. Lol :cool:

I don't quite understand the wiring diagram, here is a wiring diagram of it that I got from work.

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I wish this thread didn't die. I only have 1 fan wired to always be on. And plan to run a second fan. I want both fans to turn on and off by command, and i was thinking about using the AC button to do that since i have no AC. Im just not sure which of the 6 pins to tap for that to happen.
 

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What year is your car? Mine is a 98 and I was going to do the same thing. I want to use the a/c button to turn my manual fan on and off.

My button has five wires:
Black
Black/Yellow stripe
White/Black stripe
Blue/Yellow stripe
Green/White stripe

https://www.dsmtuners.com/threads/2gb-ac-circuit.517652/
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Yeah, don't tap the pins. I cut off the male fan connectors and soldered my own toggle switch wiring to them. I didn't run to the AC button though, I have my own little cupholder switch panel. I imagine if you wanted to run to the AC switch it's just a matter of taking it apart and seeing whats what.
 
I wish this thread didn't die. I only have 1 fan wired to always be on. And plan to run a second fan. I want both fans to turn on and off by command, and i was thinking about using the AC button to do that since i have no AC. Im just not sure which of the 6 pins to tap for that to happen.
The circuit between 1g and 2g are different. How do you want the two fans work?
Any switch can be used and the switch in your pic is 1g's I think, so if you want to use that switch, refer the diagram below and use it as a trigger. (Where the green circle is the switch)
It's better you use a relay for each fan and use a temp sensor as a trigger. If you want to manually turn on the fans before the sensor get the trigger temp, then you can connect the switch into the relay's trigger terminal where the sensor is connected.
In this case when the switch is off, the fans will automatically be turned on by the temp sensor but you can manually turn on the fans before the sensor triggers the fans.
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What year is your car?

90. The 1gs have a bunged sensor at the bottom of the radiator and that temp makes the fan kick on, on 2gs I believe they're controlled via ECU.

Yeah, don't tap the pins. I cut off the male fan connectors and soldered my own toggle switch wiring to them. I didn't run to the AC button though, I have my own little cupholder switch panel. I imagine if you wanted to run to the AC switch it's just a matter of taking it apart and seeing whats what.

I was thinking about getting a toggle switch. Then I can up to this post where it talked about using the AC switch as a toggle to turn on the fans if you have an AC delete.
If this was going to be too much of a pain I was going to just get a toggle and keep it simple.

My 90 is currently wired to have the fan turned on as soon as the ignition is on.

The circuit between 1g and 2g are different. How do you want the two fans work?
Any switch can be used and the switch in your pic is 1g's I think, so if you want to use that switch, refer the diagram below and use it as a trigger. (Where the green circle is the switch)
It's better you use a relay for each fan and use a temp sensor as a trigger. If you want to manually turn on the fans before the sensor get the trigger temp, then you can connect the switch into the relay's trigger terminal where the sensor is connected.
In this case when the switch is off, the fans will automatically be turned on by the temp sensor but you can manually turn on the fans before the sensor triggers the fans.
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This reply is more of the info I was looking for.

The problem with my car is that the previous owner wired a single pusher fan to run as soon as the ignition is on. Thankfully its still connected to the fuse box, cause as soon as i pull the fuse, the fan is out.

Unfortunately the original wires were cut so I can't use any OEM plug to have them run with a temp sensor (my radiator has no sensor anyway). So I want to be able to turn off the fan with a switch using the same wiring it already has. Kind of like a power kill switch sandwiched between.

Like that I can add a second (puller) fan and not drop my temps too low.

My temps drop to 150 while driving in this heat with a single fan. And if I were to add and have the second fan running my temps just rise to 130. I was logging everything.

I put a brand new 180 tstat. But yeah sorry for rambling. My problem is obviously bigger ROFL
 
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.
This reply is more of the info I was looking for.

The problem with my car is that the previous owner wired a single pusher fan to run as soon as the ignition is on. Thankfully its still connected to the fuse box, cause as soon as i pull the fuse, the fan is out.

Unfortunately the original wires were cut so I can't use any oem plug to have them run with a temp sensor (my radiator has no sensor anyway) . So I want to be able to turn off the fan with a switch using the same wiring it already has. Kind of like a power kill switch sandwiched between.

Like that I can add a second (puller) fan and not drop my temps too low.

My temps drop to 150 while driving in this heat with a single fan. And if I were to add and have the second fan running my temps just rise to 130. I was logging everything.

I put a brand new 180 tstat. But yeah sorry for rambling. My problem is obviously bigger ROFL
Understand. You can sandwich a relay or a switch.
I'm not sure how the wiring goes or or the harness condition on your car now (maybe tucked?) but if you wish to use a thermo switch/sensor at the bottom of the radiator, you can use an universal thermo switch/sensor that comes with a pigtail (so you don't need to look for the factory connector). The sensor spec should be M16x1.5 (if your radiator has the stock thread pitch) and turn on at 85°C which is very common spec for JDM cars or motorcycles.

Just one of ideas, for instance, if you don't have the factory wires anymore, use a common SPST relay for each fan. A fused 12v power from battery to the #30 relay terminal, #87 to the fan positive, a switched 12v to #86 and a thermo switch/sensor (or/and a toggle switch if you want to manually on/off) would be between #85 and the ground. You can share the thermo switch and the switched 12v between two relays.
If you use a thermo switch for one relay and a toggle switch for another, one fan would get turned on/off automatically by the thermo switch/sensor and you can turn on/off the second fan manually when you need.

In case if your harness still have a bunch of 4 wires (a thick blue, a thick black, a thin green and a thin black ), those are the factory wires for the thermo switch/sensor and the radiator fan. You can use those wires.
 
Yeah, this car has a minor wire tuck. So the harness was definitely messed with. But as of now, ill most likely by-pass the thermo switch since I'm not trying to take out the coolant just to install a sensor.

So that means I should put a toggle switch between a chassis ground and #85. Unfortunately I can't take better pics currently but this is the way the wire is set up for my pusher fan.
Seems like from 4 wires on the plug , 1 isn't used, 1 is used as a ground, and 2 are fused together for power.
I believe the thermo switch plug was also spliced.
 

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Yeah, this car has a minor wire tuck. So the harness was definitely messed with. But as of now, ill most likely by-pass the thermo switch since I'm not trying to take out the coolant just to install a sensor.

So that means I should put a toggle switch between a chassis ground and #85. Unfortunately I can't take better pics currently but this is the way the wire is set up for my pusher fan.
Seems like from 4 wires on the plug , 1 isn't used, 1 is used as a ground, and 2 are fused together for power.
I believe the thermo switch plug was also spliced.
That 4 pin plug is for A/C condenser fan. I don't know how the previous owner made the wiring and fused. but you said the power source is already fused by the previous owner. Have you ever blown the fuse for running the two fans in the same time? If you have never blown the fuse, you can simply add a relay for each fan. If you have blown the fuse, it would be safer to take another 12v with a fuse from battery for the second fan.
 
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^^^
This :thumb::thumb::thumb:
I like that idea too, as long as you haven't used up the few inputs that we have, you can program them to come on when you want.
Glad you pointed that thread out Nick! Thanks.
 
That 4 pin plug is for A/C condenser fan. I don't know how the previous owner made the wiring and fused but you said the power source is already fused by the previous owner.

Have you ever blown the fuse for running the two fans in the same time? If you have never blown the fuse, you can simply add a relay for each fan. If you have blown the fuse, it would be safer to take another 12v with a fuse from battery for the second fan.

Here's a not so better picture. Luckily you're able to see how the fan is wired from the previous owner.

Also, I haven't blown any fuse, and I actually meant to say on the previous post that I pulled the relay, not the fuse, to see if the fan would stop. This is how the fuse box came when I got the car.

And yes, it's relocated inside the arm rest :idontknow:

Also, this car only has 1 fan. I am still only running 1 fan but I did tap into the single fan (where it's soldered) with the second fan and didn't blow any fuse. I just wanted to see if the OEM fan I have works.

I'm not sure why people like to manually turn on the fans. I would highly suggest using ECMLink to trigger the fans through the fuel pressure sensor wiring. There is a whole list of parameters that you can use to turn your fans on and off.

https://www.galantvr4.org/ubbthreads/showflat.php?Number=1217298

Trust me, its not something I would prefer to do. I'm just not entirely sure how I can un-fk the wiring from the previous owner.

As you can see from the screenshots I put, I'm not exactly dealing with stock wiring LOL.
Also, I don't even have that temp sensor on the bottom of the radiator. Since this fan is wired to run as soon as the ignition is on.

But ill look into how I can do a link set up thru FPS

I was just hoping to use a switch to turn the fan off

^^^
This :thumb::thumb::thumb:
I like that idea too, as long as you haven't used up the few inputs that we have, you can program them to come on when you want.
Glad you pointed that thread out Nick! Thanks.

My problem is that I'm still discovering how this car was put together. If it were up to me, I would find ways to control stuff via link... I wouldn't have hacked any of the stock wiring, and just tucked whatever I don't use.

But this car has wires that are cut, so im trying to work with what I have.
 

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My problem is that I'm still discovering how this car was put together. If it were up to me, I would find ways to control stuff via link... I wouldn't have hacked any of the stock wiring, and just tucked whatever I don't use. But this car has wires that are cut, so im trying to work with what I have.
I would disregard any/all of the wiring done previously done on the fan. The fan wiring is simply a power and a ground. That's it. Any switch or button simply interrupts one of those two wires. There are about a million sources of info on how to wire the fans but if that doesn't help then all you have to do is ask for help. I can tell you exactly what to do to get ECMLink to control the fan.
 
I would disregard any/all of the wiring done previously done on the fan.

Yeah I get that. Which, is why I was going with the switch option since it seems like the easiest solution.
I'll admit, I've never had link in any of my previous DSMs, so I'm not too familiar with it. But i have been learning stuff on it.
Also, I'd rate my electrical skills as novice. So some of the diagrams aren't too clear. It all comes down to wanting to learn, and thats what I'm trying to do.
 
Here's a not so better picture. Luckily you're able to see how the fan is wired from the previous owner. Also, I haven't blown any fuse, and I actually meant to say on the previous post that I pulled the relay, not the fuse, to see if the fan would stop. This is how the fuse box came when I got the car. And yes, it's relocated inside the arm rest :idontknow:

Also, this car only has 1 fan. I am still only running 1 fan but I did tap into the single fan (where it's soldered) with the second fan and didn't blow any fuse. I just wanted to see if the oem fan i have works.
I still can not be so sure how the previous owner's circuit is but I think the previous owner just eliminated the thermo switch and directly ground it, like the red drawing in the pic. If it is still the same as the factory by using the stock relay where the green circle is (the one inside the arm rest), you can just put a toggle switch between the pin #2 and the ground where the red drawing.
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.
This reply is more of the info I was looking for.

The problem with my car is that the previous owner wired a single pusher fan to run as soon as the ignition is on. Thankfully its still connected to the fuse box, cause as soon as i pull the fuse, the fan is out.

Unfortunately the original wires were cut so I can't use any oem plug to have them run with a temp sensor (my radiator has no sensor anyway) . So I want to be able to turn off the fan with a switch using the same wiring it already has. Kind of like a power kill switch sandwiched between.

Like that I can add a second (puller) fan and not drop my temps too low.

My temps drop to 150 while driving in this heat with a single fan. And if I were to add and have the second fan running my temps just rise to 130. I was logging everything.

I put a brand new 180 tstat. But yeah sorry for rambling. My problem is obviously bigger ROFL
You need another new thermostat. It should never drop to 150 while driving.... Ever. That's a stuck thermostat.
 
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