Re: 89 iroc z cooling issue
i think it goes into the intake manifold somewhere.
once you do find it, you can pull the wire off and ground it to see if that makes the fan turn on. if the fan turns on, then the switch is bad. you can get a colder switch at NAPA if you want the fans to come on earlier- but they will have to break out the big book with pictures of all the temp switches and their temp ratings to find one that will work for you.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?