Aux fan only turns on when high side refrigerant pressure gets high. Jumper the wires to the pigtails of the pressure switch on receiver/dryer .
Beg, borrow or steal gauge set (Autozone loan program?) and take hi and lo pressures at 1500-2000 RPM. report pressures, ambient temp and vent temp. Do with door open, system on high.
Heavily mist the condensor with water spray; observe vent temps and pressures. report back.
I'm not the brightest, but I've done a bunch of these old A/C systems with some success.
History of system and why you're sure of leak status and charge status?
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The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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