The blower motor on my 1983 K30 did not work. Apparently the truck came with AC, but it has been removed. I replaced the blower motor, resistor and relay. Now the blower motor works on LOW, MED 1 and MED 2. In HIGH the blower reduces to a medium speed.
Before the parts were replaced, when I turned the motor on there would be no reaction in LOW, MED 1 or MED 2. When the switch was placed in HIGH, there was an audible click from outside the cab presumably at the relay - just once each time the switch was placed in HIGH - but no other reaction. At first I thought it could be the switch, but the audible click tells me the switch is at least sending a signal for something to happen.
Any ideas? Would appreciate any input.