92 chevy c1500 heater control panel only works fan on high no med.or low??

SOURCE: Heater only work on high

Most likely is the resistor when they fault the default to high giving you off and high only

SOURCE: a/c heater climat control switch

Check the relais module located inside under the rh side of the heather box you can see the connector most of them need to be replaced as they burn out you may need to replace the blower motor as well,high amp draw caused by faulty bearings will overload the blower motor controller

SOURCE: 1993 Chevy Silverado truck headlights high beam only works no low

dimmer switch has gone bad need to change your dimmerswitch

SOURCE: Need a diagram for a

the low side should have a blue cap on the service port and the high should have a red cap, also the high side port is larger than the low side. hope this helps

SOURCE: 1997 Chevy S10 pickup Fan switch for heater runs on high only.

replace the blower motor resistor located on the heater box were the blower motor is located the wiring to the blower may go to it. This is very easy to locate if you buy the part first.