“It runs hot,” the seller told me.

To address that problem I removed the nonsensical extra plumbing that took coolant from the engine block and dumped it in at the water pump ahead of flow from the radiator, installed a new water pump, and replaced the thermostat. I also put in a new ‘Voltage Stabilizer’ behind the dash and added a high air bleed valve. It still runs hot in stop and go traffic.

The radiator fan never comes on. I was about to install a manual over ride switch but thought first I would get to the bottom of the problem. In the end I still may, but the word is that the rocker switch for the cabin fan also is designed to activate the fan on the radiator. That would end the need to put in another relay and install another switch.

For the record, the fan works when hooked straight to a 12 volt source. So the fan is not the problem.

I found corrosion on the existing and probably original fan relay and while cleaning it up two parts broke. So now I’m putting in a new relay. I still haven’t figured out exactly how this thing works but here is what I have, and what I’m planning to use in it’s stead. I am unsure what to do with the three black wires but the rest appears to be consistent with the routing that others have successfully used.

Compare to this wiring diagram: