Cool fan switch location?
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Instructor
Joined: Oct 2005
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Fan temp. sensor location?
Hello, IM looking for the fan temp sensor on a 91 L98? Not sure, could anyone help please? Im looking for it so I can replace it w/ one that turns the fan on at a lower temp! 
Last edited by CMYC4; Nov 21, 2005 at 01:33 PM.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by CMYC4
Hello, IM looking for the fan temp sensor on a 91 L98? Not sure, could anyone help please? Im looking for it so I can replace it w/ one that turns the fan on at a lower temp!
Last edited by CMYC4 : Today at 11:33 AM.
Last edited by CMYC4 : Today at 11:33 AM.
In answer to the NEW question, as quoted, the fans on your '91 are both controlled by the ECM. The ECM uses the engine coolant temp sensor for the input as to the engine temp. To change your fan on/off temps will require reprogramming your prom, a new separate fan actuation system, or manual fan switch(es) that you may locate, "Where ever you decide to install it" (them).
RACE ON!!!
Le Mans Master
Joined: Apr 2000
Posts: 5,713
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From: Manassas VA
Originally Posted by CMYC4
Hello, IM looking for the fan temp sensor on a 91 L98? Not sure, could anyone help please? Im looking for it so I can replace it w/ one that turns the fan on at a lower temp!
I believe it will depend on if you have the dual fan option or not. Check out this link. http://www.zip-products.com/Zip/prod...7746622135FBCE
Also, I believe the rpo option sheet is located on the console lid or the storage compartment lid in the rear hatch area.
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Le Mans Master
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From: San Diego, Ca
Yes, you can change it. There is a bung in the left head to thread in a switch. You then connect the ground (ECM) side of the relay(s) to this switch which is going to close at whatever temp is programmed into it and turn on the fan(s). It isn't going to hurt the ECM, you don't need to reflash it, and offhand, the only downside is the extra draw on the alternator (since the fan(s) will be running longer) and if your cooling system isn't up to snuff now, turning the fans on sooner isn't going to make it any better. You can get the switch at NAPA or most of the aftermarket Vette vendors carry them. Too me, it's a waste of money as the stock set up, when clean and working, works just fine.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by SunCr
Yes, you can change it. There is a bung in the left head to thread in a switch. You then connect the ground (ECM) side of the relay(s) to this switch which is going to close at whatever temp is programmed into it and turn on the fan(s).
Originally Posted by CFI-EFI
To change your fan on/off temps will require reprogramming your prom, a new separate fan actuation system, or manual fan switch(es) that you may locate, "Where ever you decide to install it" (them).
Last edited by CFI-EFI; Nov 22, 2005 at 08:05 PM.
you. 
