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Re: Which sensor?
The IAT sensor is threaded into the underside of the plenum, probably a foot behind the throttle body. If the fans run all the time (i.e. whenever the car is running), he most likely bypassed the switch and has them running off the ignition(hopefully with a relay).
If you want the gauge to work, you will need to replace the plug with the temp sending unit, and find the wire that goes to the gauge. It will be coming through the firewall on the drivers side, behind, and to the right of the master cylinder. There are two main clusters. It is located in the cluster closest to the fender. On my '91 it is a thin, fairly dark green wire. I'll try to varify that you are looking for the same color wire tomorrow.
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“When a whole nation is roaring Patriotism at the top of its voice, I am fain to explore the cleanness of its hands and the purity of its heart.” - Ralph Waldo Emerson
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