Date registered: May 2016
Vehicle: 1985 300 TD 1981 300 SD
Location: Belleville On. Ca.
Mentioned: 1 Post(s)
Quoted: 37 Post(s)
The aux.pusher fan was activated by a temperature switch on the a/c dryer, you could try re connecting the fan, jumper the two wires at the dryer then turn the ignition to the run position with the either the defrost or hi/lo buttons pushed, this should show you if the aux fan works. From there you could wire in a manual toggle switch in the cabin to the temperature switch leads and have a manually operated aux cooling fan. Even if the stock fan is shot you can wire in a new after market fan in to replace it, in fact I replaced the stock one on my 85 with a new 10" high speed pusher this morning.