On my 87 turbo 505 SW, it appears I have only one out of three cooling fans working properly and have for some time, that shows a good level of overdesign! The right side electric fan operates at both low and high speed. The left side one works on low speed only, then shuts off when the other goes to high speed. Both operate only with the AC on, no matter how hot or cold the engine. The solenoid clutch main fan works fine when I apply 12 volts with the engine off, but with the engine at idle works only about 2% of the time.
Brian and Steve thought the high speed fan problem was due to a bad relay in the relay box in the left fender, and indeed one was icky with green goo coming out so I ordered one from the dealer (cheaper than a generic one of unknown amperage from a discounter) but don't have it yet. Any ideas why the solenoid works at rest but not when rotating at idle?
In trying to troubleshoot this problem, I have been unable to figure out what switch does what. Can anyone tell me? My thermostat has 5 thermal switches or indicators coming out of it, one small red plastic hex with one wire, one large plastic hex with two wires, one metal hex with two wires, one blue plastic rectangular one with booted wires (unknown quantity), and a similar red plastic one. Plus the right side of the radiator has two wires coming out, but that appears to be a coolant level switch. I don't know why there's so many switches when the electric fans just seem to run off the AC anyway.
Thanks, Dave Towle
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