The fan should run with the AC on. The fan resistors are a common failure at this age.
Here's some good info:
A/C and fan speeds
radiator cooling fan resistor values?
I replaced my resistors with some cheap eBay ones shipped from China. Probably wont last 10 years, but 4 cost less than $10.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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