Product Features

  • Checks air-con performance
  • Easy to read
  • Measures up to 100°C

Product Description

Measure vent temperatures and evaluate air-conditioning performance with our car A/C thermometer. Featuring a magnified dial for easy readability, the Air-Con Test Thermometer from A/C Pro measures 0-100°C.

  • Our car A/C thermometer checks air-con duct outlet and surrounding temperatures
  • Includes a magnified dial
  • Covers temperatures from 0-100°C
  • Works with all A/C systems
  • Offers easy-to-follow instructions

Usage Directions

  1. Always park your vehicle in the shade before checking temperatures with our car A/C thermometer.
  2. Start your engine and allow it to run at a fast idle.
  3. Turn the air-conditioning to MAX cool.
  4. Insert the full length of the probe into the centre A/C vent.
  5. Allow approximately five minutes to get an accurate reading on the car A/C thermometer.
  6. Readings below 15°C indicate a properly charged system.


  • There are a number of possibilities. Your compressor may be damaged and not working properly. You can check to see if it is cycling on-off properly by looking at the clutch plate face in the middle of the compressor pulley.

    If your compressor is not cycling on then you should seek the help of an A/C professional immediately. Ignoring the problem will not make it go away and in fact it could make matters worse. Other possible causes are blown relays and fuses, defective sensors, or a stuck blender door. Seek the help of an A/C professional to assist you in determining the cause in your particular case.

  • Not only is overcharging your system potentially dangerous, an overcharged system will not function properly and can seriously damage your A/C compressor or other component parts. The symptoms of an overcharged A/C system are exactly the same as a system that is undercharged: warm air out of the vents.

    In order to prevent overcharging your A/C system it is imperative to measure the pressure before beginning to charge it. To measure the pressure in the A/C system, attach a pressure gauge to the low-side port. Your car must be running with the A/C system set to maximum cool and the fan in its highest setting.

    It is important to note that the proper pressure in your A/C system is dependent on the ambient (outside) temperature. To determine the proper pressure for your system consult a pressure chart, or set the bezel arrow on your pressure gauge to the corresponding ambient temperature and charge to the pressure corresponding to that temperature setting. If the outside temperature is at or below 55°F do not charge your car. Also, never charge your vehicle above 55psi.

  • The answer here is two-fold. It is possible that the system has a small leak, and now is low on refrigerant. This will allow the system to blow cold, but just not as cold as it used to. In this case check the low-side pressure and verify if the system is low on refrigerant. If it is low on refrigerant add refrigerant or a refrigerant with a stop leak to the correct pressure.

    If your pressure is correct, adding additional refrigerant will not make the system blow out colder air, but will in fact cause the system to become overcharged. This causes the system to work less efficiently and will result in warmer air blowing from the vents.

Often bought together