Jul 052017
 

 Ford Focus

How to release air pressure from my air conditioner?

I’m wondering how to release air pressure from my air conditioner? I was told that I have too much which is making my air blow out hot air.  It is a 2011 Ford Focus. Thank you…


You will need to have this done with an air conditioning recovery machine. Just about any local auto repair shop will have one of these.

Overfilling the air conditioning system is more common than you might think. This happens even more often on newer vehicles. The newer air conditioning systems only require a small amount of Freon making it easier to overfill. Older vehicles used to requires as much as 4 to 5 lbs. Nowadays you will see 1 to 1/5 lbs.

Freon Fill Capacity – 2011 Ford Focus

R-134a Refrigerant 0.51 kg(18 oz)(1.12 lb)

Air Conditioning (A/C) System Recovery, Evacuation and Charging

  1. Prior to recovering, the purity of the refrigerant must be verified.
  2. Connect a R-134a Refrigerant Management Machine to the low- and high-pressure service gauge port valves following the operating instructions provided by the equipment manufacturer.
  3. Recover the refrigerant from the system following the operating instructions provided by the equipment manufacturer. Note the amount of oil removed during the refrigerant recovery (if any). Add that same amount back into the system once repairs are complete.
  4. Once the R-134a Refrigerant Management Machine has recovered the refrigerant, switch OFF the power supply.
  5. Allow the system to set for about 2 minutes, and observe the system vacuum reading. If the vacuum is not lost, disconnect the recovery equipment.
  6. If the system does lose vacuum, repeat Steps 3 through 5 until the vacuum level remains stable for 2 minutes.
  7. Carry out the required repairs.

Refrigerant System Evacuation Using a R-134a Refrigerant Management Machine

  1. Connect a R-134a Refrigerant Management Machine to the low- and high-pressure service gauge port valves following the operating instructions provided by the equipment manufacturer.
  2. Evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) of vacuum and as close to 101.1 kPa (30 in-Hg) as possible. Continue to operate the Vacuum Pump for a minimum of 45 minutes.
  3. Turn OFF the Vacuum Pump. Observe the low-pressure gauge for 5 minutes to make sure that the system vacuum is held.

Refrigerant System Evacuation Using a R-134a Manifold Gauge Set and Vacuum Pump

NOTE: Leaks in refrigerant system service equipment, hoses or gauges can cause a leak in vacuum that may be misinterpreted as a problem with the vehicle’s refrigerant system. It is necessary to leak-test all refrigerant system service equipment, hoses and gauges on a weekly basis to verify that no leaks are present.

  1. Connect the R-134a Manifold Gauge Set to the low-side and high-side service gauge port valves.
  2. Connect the center (yellow) hose from the R-134a Manifold Gauge Set to the suction port on the Vacuum Pump.
  3. Open all valves on the R-134a Manifold Gauge Set and both service gauge port valves.
  4. Turn on the Vacuum Pump and evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) of vacuum and as close to 101.1 kPa (30 in-Hg) as possible. Continue to operate the Vacuum Pump for a minimum of 45 minutes.
  5. Close the high-side and low-side valves on the R-134a Manifold Gauge Set (not the service gauge port valves) and turn OFF the Vacuum Pump.
  6. Observe the low-pressure gauge for 5 minutes to make sure that the system vacuum is held. If vacuum is not held for 5 minutes, leak test the system, repair the leak and evacuate the system again.

Refrigerant System Charging Using a R-134a Refrigerant Management Machine

  1. Lubricate the refrigerant system with the correct amount of clean PAG oil.
  2. Connect a R-134a Refrigerant Management Machine to the low-side and high-side service gauge port valves following the operating instructions provided by the equipment manufacturer.
  3. Set the refrigerant charge amount, and charge the refrigerant system following the instructions provided by the equipment manufacturer.

Refrigerant System Charging Using a R-134a Manifold Gauge Set and Automatic Refrigerant Charging Meter

NOTE: Ford Motor Company recommends use of a R-134a Refrigerant Management Machine to carry out charging of the refrigerant system. If a R-134a Refrigerant Management Machine is not available, refrigerant system charging may be accomplished using a separate Automatic Refrigerant Charging Meter and R-134a Manifold Gauge Set.

  1. Lubricate the refrigerant system with the correct amount of clean PAG oil.
  2. Assemble the R-134a Manifold Gauge Set, Automatic Refrigerant Charging Meter and R-134a supply tank following the Automatic Refrigerant Charging Meter operating instructions.
  3. Charge the refrigerant system following the Automatic Refrigerant Charging Meter operating instructions.
  4. If the refrigerant flow stops before the refrigerant charge is complete, start the engine, select MAX A/C operation and allow the refrigerant charge to complete.

 

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