I would suspect either the switch, wiring, or the blower resister, the 1st thing I would do is pull the connector off the blower resister and clean the contacts. It the fan works in 2 of the 4 positions I don't think it is the fan. The resister should not come into play for the high position just the the others, you could jump the power directly to the high position to bypass the resister.
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Jeff R
60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
1971 Fiat 130 Coupe 3.2L SOHC V6, ZF 5-speed
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
05 Dodge Magnum 3.5L SOHC V6
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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