Fan switch override
#1
Fan switch override
Done some searching but can't find my answer... I'm sure someone on here has done this.
I installed 05 E Fans on my 01 GMC using the 3 relay harness and 2 pins into the computer harness. 1 in PIN 42 and 1 in PIN 33. Everything works great and I'm really happy with this mod.
Now for track use, I would like to put an override switch so I can run the fans whenever I want. Not sure how or where to wire that in. Anyone that has done this, can you post up a pic or info on how to do this. Thanks.
I installed 05 E Fans on my 01 GMC using the 3 relay harness and 2 pins into the computer harness. 1 in PIN 42 and 1 in PIN 33. Everything works great and I'm really happy with this mod.
Now for track use, I would like to put an override switch so I can run the fans whenever I want. Not sure how or where to wire that in. Anyone that has done this, can you post up a pic or info on how to do this. Thanks.
#2
I have a gauge for that
iTrader: (42)
Try this
https://www.performancetrucks.net/fo...-truck-542739/
The 3 in the picture in the first post are in addition to the 3 in your main harness. Depending what type of switch you use and if you have the ac sensor installed you could get away with just 1 more instead of 3 more.
https://www.performancetrucks.net/fo...-truck-542739/
The 3 in the picture in the first post are in addition to the 3 in your main harness. Depending what type of switch you use and if you have the ac sensor installed you could get away with just 1 more instead of 3 more.
#3
Ok thanks man, I will look into this a little more this weekend. I do have the ac sensor but my wire harness does not tap into the AC at all. It just has the 2 pins going to the computer. So both fans come on at low speed 190 temp then when it reaches 205 or 210 don't remember were I set it to, both fans go to high speed.
#5
Sorry man, I'm not following you how the AC Pressure controls matter for an override switch? My fans work perfect right now, I just want to add a switch in the cab for track use only.
Sorry, electrical/wiring is not my strong point.
Sorry, electrical/wiring is not my strong point.
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#9
Oh ok, I think I get it now....Maybe.
So off the manual high relay tab 85 I add another relay before going to the switch?
Or do I just wire in a switch off tab 85 on the manual high relay?
Because I already have the 3 relay harness that kind of looks like it is wired the same way as your diagram.
So off the manual high relay tab 85 I add another relay before going to the switch?
Or do I just wire in a switch off tab 85 on the manual high relay?
Because I already have the 3 relay harness that kind of looks like it is wired the same way as your diagram.
#10
I have a gauge for that
iTrader: (42)
This is the easiest way, but you will never have 1 fan high with the other off operation if that's important to you. You can get around this by using a DPDT switch (and eliminate the relay) that has 3 positions off Low, Off, and High, but this may be more than you need or want.
Ah screw it, I attached that diagram as well.
Ah screw it, I attached that diagram as well.
Last edited by Atomic; 07-28-2016 at 12:51 PM.