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fan override switch

turbowop

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Apr 29, 2001
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11,971
Location
Yakima, WA
What would be the easiest way to tackle this? I want stock radiator fan functionality retained for both my AC (pusher) and radiator (puller). I'm going to install a 180* thermostat so I just want to wire in a switch to flip the fans on when in stop/go traffic or waiting in the staging lanes at the track. My coolant temps are perfectly normal for a stock car, but I'd like to get them down a bit during those driving conditions. I'm sure all I have to do is run a wire to the fan relays, but I'm not sure if I should go to the relays or to some random wire under the hood that's maybe easier to access. Anybody else done this?
 

Jason G.

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Joined
Oct 7, 2003
Messages
3,279
Location
Anderson, SC
IIRC, the single wire sensor on the back side of the t-stat housing closest to the cylinder head will run both fans when grounded.
Maybe wire in a switch there?
 

brisvr4

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Joined
Feb 13, 2004
Messages
955
Location
brisbane australia
^^ correct. I use an old power/economy switch in the console to activate mine. It also runs both fans on high.
 

mitsuturbo

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Joined
Jun 2, 2008
Messages
3,537
Location
Near Seattle, Washington
Quoting Jason G.:
IIRC, the single wire sensor on the back side of the t-stat housing closest to the cylinder head will run both fans when grounded.
Maybe wire in a switch there?



This is precisely what i'd do. If you're worried about the factory function of that temp switch, leave it plugged in, and simply tap in a wire that will go to switch. Wire the switch to ground. Enjoy.
 

toybreaker

iconoclast
Joined
Apr 30, 2006
Messages
3,581
Quoting Jason G.:
IIRC, the single wire sensor on the back side of the t-stat housing closest to the cylinder head will run both fans when grounded.
Maybe wire in a switch there?



... fwiw, this will also kick off the a/c compressor
 

turbowop

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Joined
Apr 29, 2001
Messages
11,971
Location
Yakima, WA
I went and looked in the engine bay. Rather than run a wire all the way to the thermostat housing to tap that wire, is there a place closer to the fuse box under the hood that it's accessible? I did pull that wire off the switch to confirm that it turns on both fans when grounded, so I just need to find a closer place to tap into it.
 

misterfixit

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Joined
Aug 4, 2004
Messages
1,578
Location
Midlands, UK
From the a/c compressor controller.

Rich
 
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