Evacuate and charge conditioning

Evacuating the air conditioning 

Prerequisite 

The engine is switched off.

• Carry out the service function:
  • Body
  • Heating and air conditioning functions
  • Drain/fill up refrigerant circuit
• Remove the sealing caps from the refrigerant filler necks.
• Connect the high pressure line of the A/C service station with the vehicle's high-pressure connection (red).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Connect the low-pressure line of the A/C service station with the vehicle's low-pressure connection (blue).
• Start the suction process on the A/C service station.
• Adhere to an suction time of at least  30 min.
• During suction process, allow the blower of the heating and air-conditioning unit to run at middle blower speed.
• If the vacuum does not remain stable during suction process:
  • Run the ABL for leaks in the refrigerant circuit.
  • Rectify leaks in the refrigerant circuit.

Charging the air conditioning 

Prerequisite 

The service function must be active.

The engine is switched off.

Heating and air conditioning system is switched off.

The refrigerant circuit is evacuated and tight.

Vehicle must be positioned on the ground.

Check 

• Check whether the rate of refrigerant loss as per Table 1  is exceeded.

Table 1  indicates the permitted loss of refrigerant after a specific period of time.

The system is not  leaking.

Result 

» The rate of refrigerant loss as per Table 1 is not exceeded  .

Measure

• Top up lost refrigerant.

Do not  top up refrigerant oil.

Result 

» The rate of refrigerant loss as per Table 1 is exceeded  .

Measure

• Top up lost refrigerant.

Top up refrigerant oil according to Table 2  .

Table 2  indicates the amount of refrigerant oil to be added  after a specific period of time in the case of an unacceptable  loss of refrigerant due to a leak.

Check 

• Check whether and why parts of the refrigerant circuit have been replaced.

Result 

» Version A:  Parts of the refrigerant circuit have been replaced as preliminary work for further work or due to gradual leakage (minor leak, e.g. hairline crack).

Version B:  Parts of the refrigerant circuit have been replaced due to sudden loss of refrigerant (major leak, e.g. broken pipe due to accident).

Measure

• Add refrigerant oil according to table:
  REFRIGERANT OIL SPECIFICATION
  
  

  	Version A	Version B
  Air conditioning compressor(1).	(1).	(1).
  Evaporator	10 ml	35 ml
  Air conditioning condenser without integrated desiccant insert	20 ml	35 ml
  Air conditioning condenser with integrated desiccant insert	40 ml	55 ml
  Desiccant insert/dryer flask	20 ml	55 ml
  Per replaced refrigerant line	10 ml	35 ml
  Safety pressure switch, gaskets	0 ml	0 ml
  (1) Air conditioning compressor: see 6452, lubricating the air conditioning compressor

• Top up determined coolant oil level into the refrigerant circuit.
• Fill the amount of refrigerant as per the nameplate into the refrigerant circuit.
• Disconnect the high pressure line and low pressure line on the vehicle.
• Drain the high pressure line and low pressure line.
• Once again close the refrigerant filler neck on the vehicle with the sealing caps.

Courtesy of BMW OF NORTH AMERICA, INC.