My 87 Gn's radiator fan isn't kicking on at all. I know about the 3 relays on drivers side under hood, relay #22 coolant fan delay relay, #23 low speed fan and #24 high speed fan relay. Any ideas before I start spending money?
Run some test leads directly from the battery to the fan itself first and see if it still works. If so, get a volt meter and see if you have power going to the fan relays. I seem to recall that they are fed through a fusible link.
I disagree. My fan was coming on when the temp was around 215 and then shutting off around 200. Turned out that switch was at fault. Drove me crazy because I knew the fan worked. I thought maybe a gremlin got into the chip or something and only commanded the fan to come on at 215.
Modern computer chips (or most older ones for that matter) turn the fan on sooner than 215. My fan switch is not connected but the harness is connected to a toggle switch inside I use to cool the engine down in the pits at the dragstrip.
Happened to me too. That's why I mentioned the fusible link in post #3. I moved the fan relay feed to run directly off the back post of the alternator and relocated the fusible link into that new connection. Easier to check and service that circuit now.