Automotive AC repair

Automotive AC repair is easy to do and can be done by a technician or you can do it at home if you have knowledge on how automotive ACs work. Most problems experienced by an automotive AC are visible on the AC or from the tools used to check on the AC. The first thing to do is to check the pressure using pressure gauges which use PSI.

If on checking the pressure you find that the compressor has high discharge pressure this may mean one of the following:

  • The compressor maybe clogged-you will need to clean the condenser
  • The AC system has been compromised by having air within-to fix this you will need to recharge the AC
  • An overcharged AC-Remove the excess refrigerant
  • The discharge valve could be closed-open the valve
  • For low compressor discharge pressure could be as a result of:

  • Leakage-Identify where the leak is located using a tracer dye then fix the leakage
  • Low level of refrigerant-add the refrigerant
  • Defective expansion valve-replace the valve
  • Suction valve closed-open the suction valve
  • After checking the suction pressure and finding high pressure the following could be the cause:

  • Leaking head gasket on compressor-Replace the head gasket
  • Loose expansion valve-Tighten the valve
  • Overcharged system-Remove some refrigerant
  • Expansion valve stuck open-Replace the expansion valve
  • When there is low suction pressure

  • Shortage of refrigerant-This is easily fixed by adding refrigerant
  • Compressor head gasket leaking-Replace the compressor head gasket
  • Kinked or flattened hose-Replace the damaged hose
  • Compressor suction valve leaking-Change the valve plate
  • Some of the problems can be detected without using the pressure gauge such as finding out that your compressor is not working. This could be caused by a variety of reasons:

  • Broken belt-This can be fixed by replacing the belt
  • Broken compressor piston-This can only be fixed by replacing the compressor
  • Bad thermostat-Replace the thermostat
  • Bad clutch coil-Replace the clutch coil
  • The diagnosis that you do may show that the evaporator is not cooling and presents itself as hot air leaks into the car and could be as a result of:

  • Frozen coil where the switch is set too high-Turn the thermostat switch back
  • The drive belt slipping-Tighten the belt
  • Shortage of the refrigerant-Add the refrigerant according to the instructions it comes with
  • Frozen expansion valve-Evacuate and replace the drier
  • The following steps could help you determine what is wrong with the AC and how to fix it. However if you find the steps are too complex you can always contact the various automotive AC repair companies so you can get a technician to come and fix the AC. The repair people will also advice you to get regular maintenance to prevent irregular breakdowns and costly replacement of parts. This article may help you understand the terminology so that even as you receive the diagnosis from the technician you can be able to tell the different problems and the provided solutions.