Once on my 75 and twice on my 80 I have taken the hose to the inteior of the engine compartment and the aux fan came on and would not go off. I pulled the fuse to stop it then cleaned the connections
1. at the base of the radiator, two prong plug there.
2. at the top of the AC dryer there are two sensors, one for the compressor and one for the aux fan. I pulled both these apart and cleaned and dried them.
Solved my problems.
Now I am much more careful with the hose..
I do not know if any of these things apply to an 87 or not. Sorry that's too new for me...
