Heater problem...

Alright well when I first bought my car a yr ago it only had 2 speeds for the fan to blow air(3,4), then eventually it just completely stopped working. So far I’ve replaced the resistor(from Acura), blower motor(aftermarket), and a speed control switch which came out of an Integra that it had been working in. It really sucks driving in really cold weather with no heat and when it rains it’s horrible cause I have no defroster. I was just wondering if anyone had any suggestions on what I could check next. By the way I’ve already checked the fuse in the fuse compartment in the kick panel, any other fuses or relays I should check?

Car: 91 Integra GS

Check wiring harness at the resistor (and other places). If the damage was due to water leakage in th past, the harness may have been corroded.