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How to Fill Your Air Conditioning System with Freon


How to Recharge Air Conditioning System with Freon

Many consumers have attempted to refill their vehicle A/C systems with recharge kits purchased at local auto parts stores. These kits are successful only about 50% of the time. There are several reasons these home repairs fail or are ineffective:

  1. The system needs to be at a lower pressure than the Freon source in order to accept the charge. If it is not, the Freon will escape when the line is disconnected resulting in a serious ecological hazard.
  2. The A/C system cannot compress air, only a liquefiable gas such as Freon. Air in the system will prevent the acceptance of the Freon. Running an A/C system containing air will not cool and create a high-pressure condition damaging the system
  3. If there is a leak in the system all the Freon pumped in will leak out again.
  4. The home repair kits do not measure the Freon contained in the system. It is critical to fill according to the manufacturer’s specification. Over charging will cause leaks, damage components, blow out seals and gaskets resulting in system failure. Under charging may cause over cycling of the compressor damaging bearings.
  5. Converting the fluid ounces to PSI can be complicated and a challenge for many home mechanics.
  6. The Freon level may be fine and the problem could be electrical or due to a faulty sensor.

Recharge or refill you air conditioning at home

Professional Fleet Services has all of the diagnostic equipment to distinguish between a mechanical or electrical failure and a low Freon condition. In addition, they will add a dye to the Freon showing where a leak occurs if one exists. They will also evacuate the system before filling then refill according to the manufacture specifications. They are also EPA monitored to safely handle the A/C refrigerant.

If you are still determined to maintain your system at home, execute the following steps carefully:

  1. You will need manifold gauges, vacuum pump and Freon.
  2. nstall the A/C manifold gauges on the vehicle and connect the yellow hose to the vacuum pump.
  3. Connect the blue hose to the low side and red hose to the high side.
  4. Vacuum down the system to -30 PSI.
  5. Allow to pump down for 10-15 minutes.
  6. Shut off pump and allow system to sit for 15 minutes while monitoring for leaks (indicated by pressure approaching 0)
  7. If no leaks, close valve on the yellow hose, detach from the vacuum pump and install on the Freon source.
  8. Fill according to vehicle specifications indicated on label under the hood. Average system requires 1.5-2 lbs. of Freon.
  9. Close off all valves, remove hoses and gauges from the vehicle.

If you run into problem it is time to call Sam @ Your Lansing Auto Repair Experts!


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