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Wow. Great minds think alike. Recently, having repaired the air on our 83, 90 and 91 240's, I was amazed at how much more efficient the later cars are. Condensor style is similar, and certainly the 83's condensor is older and not as pretty, but the difference was amazing. After buying and considering installing a '92 condensor fan, I opted instead for an aftermarket unit, one of the readily available pancake fans. Much easire to install since the 83 did not have all the holes etc. I ran a hot lead from the fender well terminal block to a relay. Radiator on this car had already been replaced and had a temp sensor mounted in it--unused. Originally I had planned on wiring the hot lead of the relay coil to the OD solenoid. That way whenever fourth was in, the fan would not work. However, since the default for the OD solenoid is "energized", that is, fourth available, that won't work. The OD solenoid is energized even at idle, when the fan is really needed, so it cannot be switched through the OD solenoid. I'm currently working through the schematics to see if there is a speed signal I might tap, but so far I've found nothing. Thus, for the moment, the hot signal to the relay comes from the compressor clutch circuit, through the temp switch, to the fan. Relay ground leg is just grounded. I was going to run the hot from the clutch, and the ground through the temp switch, but that seemed extreme.
Check out mattsonsradiator.com Of course you can get Hayden fans just about anyplace as well, P-Boys etc.
Good luck. If you come up with an answer to the OD issue, I'd love to hear it!
DS
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