So I've seached site and tried bunch of things for my 93 hijet but I still cant seem to get The fan to start to cool it down. I tested fan it still work.but I have power to only one side Of fan plug( green plug)or relay how does this operate I have changed thermostat. I have bled and flushed rad. I have checked hoses none of them are collapsed at high rpm. Is there a relay that I can change..
I think the fan switch just completes the circuit to ground, Try jumping the wire with power to the engine block to see if the fan starts, If it does, you need a new fan switch, Cheers Bob Jonah
There seems to be a flow circuit of some kind. If you empty the rad you'll see that it won't run. I don't know how this works, but when my rad was low on antifreeze the fan would not run.
