Heater A/C controls
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: heater control 98 chevy s10 blazer
These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.
SOURCE: chevy steering wheel controls
You first have to disarm and remove the air bag (unscrews with bolts from behind the steering wheel) and then you will see the screws for the switches. Only the silverado awitches will work.
SOURCE: no power to the heater/ac control of our 89 chevy silverado
IF YOUR BLOWER MOTOR IS GOOD AND FUSE IS GOOD TO AC/HEAT THAN THE CONTROL BOARD IS NO GOOD
SOURCE: How do you replace the pressure control solenoid
The pressure control solenoid is inside the transmission under the pan on the drivers side. To replace it you will need a lift and a trans jack. It is really hard to do on the ground because you have to remove the sub-frame from the car. If you are not familiar with trans components and removal you may be better off taking it to a shop. You can do more harm than good. Good Luck
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