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1. Should the fan motor run continuously when AC is turned on? It runs intermittently on & off.?
That's weird.... Every car I know of keeps the fan on for ac, some modern ones turn it off at driving speeds, but that's an old car, that ive never worked on so i have no clue.
But in general, you need it... Its possible for the evaporation to not fully happen, which allows liquid to enter the compressor, then its ghandi. A fan keeps it efficient enough to prevent this. But on most classic modern cars with a single fan, you have a high and low speed, which can be fed by up to 3 separate circuits. IE, low for ac, low for say 190-210°, high for ac + 190+°, high for 230°+ etc. Edit: I forgot to mention, trans temp can kick it on, on some cars.
That's a question for a honda forum as far as the fan speeds IMHO,
but I vote for checking for the plug in the water pump, testing/replacing tstat, and back flushing the cooling system just because its gonna get drained anyway. I also would go for some real acid like CLR for the cooling system, just because some old cars have electrolysis type corrosion going on, and it just needs to be done, especially with aging wiring etc. Its all over my head, so I just flush annually..... But I get results in the drain pan, so its something to do with my sensors and grounds drawing or creating a current. I'm not a science doctor, but my coolant creates deposits. Yearly.
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