Ac and heat will not turn on
Ok the description of problem is lacking some information so I will give you a few places to start from the easy to the difficult. When you say will not turn on I assume you are referring to the blower motor. You do not mention what car or truck assuming that I was in the Chevy section you have a GM car or truck.
Start at the fuse panel and see if there is a defective fuse. (note I have see fuses that look ok but hare bad so if you are not absolutely sure it is cheep to just replace or try a know good if you do not have a tester. The next and most likely culprit is the blower resistor. This is located on the heater box depending on the model /year and options it can be inside car or out side under hood. Replacement can be a two hammer to a all out 4 hammer depending on where it is buried. if the resistor is burned up it is common to have the harness end burned up too so check the end that plugs into harness for melted or burnt contacts, a good tell tail sign is that the plug in harness is melted to the resistor. If the resistor checks out and all is good there then check the blower motor. The blower motor should be checked if the resistor is defective too as a faulty motor that binds or has defective bearings can place heavy loads on the resistor causing it to fail. With out much to go on with your question if the motor is blowing but not much air is moving then check the filter if equipped. I did not mention the control panel as this is usually the last par to become defective on most GM cars and trucks... good luck
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