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I have an '89 that developed a radiator problem. End result was that the transmission fluid became contaminated with engine coolant. The transmission never worked good after replacing the radiator and several tranny flushes. I'm confused about your problem because it seems like the transmission fluid has leaked into the radiator (versus the coolant leaking into the transmission fluid). On my '89, I checked the auto tranny fluid level and it looked like pepto-bismol. The auto tranny fluid should be dark red...not pink.
If your tranny fluid color is normal, you should consider yourself very lucky. I had to replace the transmission on my '89 one year after I had replaced the radiator ...even after several auto tranny fluid flushes. You should NOT drive your vehicle anymore until you've put on a new radiator and you've completely flushed the engine coolant. For the tranny, I'd drop the pan and make sure no signs of water intrusion are present. The AW70s are tough..but anti-freeze/water in the tranny will certainly spell death for the tranny.
Until you've fixed the radiator problem, I wouldn't worry about the OD solenoid issue. The OD solenoid replacement isn't that difficult. The most common culprit is either the wire that runs from the shifter to the solenoid is bare and grouding out somewhere or the OD relay is messed up. Three things to consider: 1) OD solenoid , 2) wiring to the solenoid, and 3) OD relay.
Good luck.
Cabbie2169
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