Has anybody tried this solution:

I have installed an adjustable fan switch which has several major advantages over previous fan mods:

No SES codes!

You do not have to run wires into your interior.

No dash switch is required.

You get a closer temerature range than computer programming.

You can adjust it for any temerature thermostat.

It does not interfere with normal computer function.


The adjustable fan switch is available at Pep Boys for $21.99. It is manufactured by Hayden automotive under part number 3653.

Crimp style connecters are supplied with the switch, but I suggest soldering the wires for a corrosion proof, trouble free connection.

Start by disconnecting the battery (remember your radio code).
Open the fuse block lid and press the release tab shown in the picture so that you can flip the block upside down to gain access to the wires.
Carefully strip away about 3/8" of insulation on the Blue and Red wires shown in the picture. If you are using crimp connectors (easy but not recommended) you can cut the wires and strip 3/8" off each end.
Connect an 18" piece of the wire supplied with the switch to the wires you just stripped and crimp (solder preferred). Tape the splices and replace fuseblock and lid.
Route the wires over to the side of the radiator.
Drill an extra 1/4" hole in the switch mounting bracket so you can use the existing bolt on the core support. Mount the bracket to the bolt and the switch to the bracket.
Crimp (and solder) the two wires to the supplied push-on spade connectors and push them onto the switch terminals.
Remove the top radiator cover and air box to gain access to the radiator. Route the sensor lead across the radiator as shown.
CAREFULLY enlarge the fins to allow the sensor to be inserted between a pair of radiator tubes. Insert the sensor and use a dab of silicone to hold in place. Use a dab of silicone to secure the sensor lead to the plastic sheild covering the top of the radiator. (Although the sensor is usually mounted behind the radiator, I find it is much more sensitive to temperature change when mounted as shown).
Replace the radiator cover and air box.
Connect battery and confirm fan operation by turning switch adjustment screw until fan turns on. Turn the switch clockwise to turn fan off.
Start the engine and when you can feel hot water entering the top of the radiator (which indicates the thermostat opened), turn screw counter-clockwise until fan turns on.

 

Basically, the thermoswitch leads are attached between the primary fan relay's high voltage hot lead and high voltage switch side, with the temperature sensor being placed in the radiator fins. The turn on temp is adjustable. This seems straight forward and simple to install. Does anybody have feedback on whether it works (97 fbody). I've used this sucessfully on two jeeps, but they both were pre OBDII. It worked great.

 

The first part sounds like you tried it and the second part seems like you are asking if it works. There's no reason why it wouldn't. Why don't you try it and see (if you haven't, of course)

 

I saw a write up for an F-body, about installing this, somewhere on the web. Wish I had bookmarked it. The guy was pleased with the way it worked. I think it was on a LS1 site somewhere.

 

Sorry about the confusion. I've done this on non-OBDII cars. I have a 97 lt1 firebird and want to try it, but don't know if it will set off an SES code or mess up the computer.