A few quick checks you can do to diagnose a problem with your vehicles air-conditioning.  Always check your air conditioning/heating with your engine running.

• Inside vehicle
  
  1)  Does the blower fan work?  Does the fan work on all fan speeds?
  
  No/  The Air conditioning won't work without the blower fan in most vehicles. See technician.
  
  2)  Is the Air conditioning switch working?  Does the switch illuminate when turned on?
  
  No/  There maybe an electrical fault.  See a technician.
  
  3)  Is there good Air Flow from the vents?
  
  No/  Vents may be blocked or disconnected behind the dash board.  See a technician.
  
  4)  Do all vent controls work?  Ie: Face, Foot, Demist, Fresh Air/Recirculate.
  
  No/  See a technician
  
  5)  Does the temperature change (Hot/Cold) when adjusted?
  
  No/  Temperature not changing could indicate a fault with the heater tap, Hot/cold blend-door or controls.  Your air conditioning may be working but heat is bleeding into the vent system causing the Air conditioning "coolness" to be cancelled out.
   See a technician.
  
  Heating
  1) Is there hot air coming from the vents when temperature is set to hot?
  
  No/ Engine cooling system blocked,heater tap faulty, Hot /Cold flap blend -door  or controller faulty,thermostat jammed open.  See a technician.
  
  
• Under Bonnet
  
  6)  Is the compressor engaging?  Does the magnetic clutch pull in when the Air conditioning is switched on?  You can usually hear a click noise from the compressor when the clutch engages.
  
  No/ The Air conditioning system may be empty, lower refrigerant or an electrical fault.  See a technician.
  
  7)  Is the suction Pipe at the firewall cold? 
  
  No/  If you feel the Air conditioning is not working efficiently.  See a technician.

If you feel Automotive Air Conditioning is not working efficiently.
See a technician!


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