- Check that all electrical connections to the compressor are secure and free of corrosion.
- Check the refrigerant pressure. If it is too low, the compressor will not turn on.
- Check the AC relay and fuse. If they are blown, the compressor will not turn on.
- Check the low-pressure switch. If it is faulty, the compressor will not turn on.
- Check the expansion valve. If it is clogged, the compressor will not turn on.
- Check the evaporator core. If it is clogged, the compressor will not turn on.
- Check the condenser. If it is clogged or damaged, the compressor will not turn on.
- Check the control module. If it is faulty, the compressor will not turn on.