In a word: “Badly”. Those things have always been flakey, and the normal advice is what you’ve already tried – resolder. Your best option is probably to hunt out a second hand one and swap the board.
Can anyone tell me how the "auto" setting on the MK3 Supra works?
The fan will not switch on automatically anymore with the fan selector set to auto. It was working, then stopped abruptly while I was driving, briefly restarted, then quit again.
The fan work fine at all speeds manually.
All of the solder joints have been re-flowed on the controller
The VSV is working.
The heater is working.
The circuit diagrams are pretty confusing.
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