64 50 010 Extract, evacuate and fill air conditioning system

Overview of Activities 

Keyprocesses 

1. Drawing off the air conditioning
2. Evacuating the air conditioning
3. Filling the air conditioning

Additional Information 

General information 

Keyprocesses 

1. Drawing off the air conditioning 

   Prerequisite 

   Engine switched off.

   CAUTION: Refrigerant circuit under high pressure. 
   Danger of injury!

   • Note and follow safety information on containers.
   • Avoid contact with refrigerant; wear safety goggles and protective gloves.
   • For more information see: 64 50 Handling refrigerant and 6450 Notes on air conditioning repair work
   • Run the engine for a few minutes at a low engine speed (800-1200 revolutions per minute) and with the air conditioning switched on.
   • Stop the engine.
   • Remove the sealing caps of the refrigerant filler neck on the motor vehicle.
   • Connect the high pressure line of the A/C service station with the vehicle's high-pressure connection (red).
   • Connect the low-pressure line of the A/C service station with the vehicle's low-pressure connection (blue).
   • Start the evacuation on the A/C service station.
   • During drawing off, set the blower of the heating and air-conditioning unit to the middle blower speed.
     Fig 1: Evacuating Heating And Air Conditioning System

     Courtesy of BMW OF NORTH AMERICA, INC.
   • Record the amount of evacuated refrigerant after having completed evacuation.
   • Keep the sheet with the recorded quantities (values are once again required upon filling).
   • Disconnect the high pressure line and low pressure line on the motor vehicle.
   • Drain the high pressure line and low pressure line.
   • Once again close the refrigerant filler neck on the motor vehicle with the sealing caps.
   • Correctly dispose of the drained refrigerant oil.
2. Evacuating the air conditioning 

   Prerequisite 

   Engine switched off.

   • Remove the sealing caps of the refrigerant filler neck on the motor vehicle.
   • Connect the high pressure line of the A/C service station with the vehicle's high-pressure connection (red).
   • Connect the low-pressure line of the A/C service station with the vehicle's low-pressure connection (blue).
   • Start the evacuation process on the A/C service station.
   • Keep to the evacuation time of at least 30 min  .
   • During evacuation, set the blower of the heating and air-conditioning unit to the middle blower speed.
   • If the vacuum does not remain stable during evacuation:

     Run the ABL for leaks in the refrigerant circuit.

     Fig 2: Evacuating Heating And Air Conditioning System

     Courtesy of BMW OF NORTH AMERICA, INC.
     • Rectify leaks in the refrigerant circuit
3. Filling the air conditioning 

   Prerequisite 

   Engine switched off. Refrigerant circuit evacuated and sealed. Vehicle must be positioned on the ground.

   CAUTION: Refrigerant circuit under high pressure. 
   Danger of injury!

   • Note and follow safety information on containers.
   • Avoid contact with refrigerant; wear safety goggles and protective gloves.
   • For more information see: 64 50 Handling refrigerant and 6450 Notes on air conditioning repair work

   TECHNICAL INFORMATION 

   Filling a raised vehicle will result in insufficient filling levels!

   • Determine the quantities of new  refrigerant oil to be refilled:

     In addition  to the drawn off and recorded amount of refrigerant oil, add the following quantities (if applicable):

     Amend the refrigerant oil losses over time as per the table: 

   Table 1  indicates the permitted loss of refrigerant after a specific period of time. There is no  leak. Refrigerant oil must not  be topped up.

   Table 2  states the amount of refrigerant oil which must be topped up  after a specific period of time with an impermissible  loss of refrigerant due to a leak.

   Case 1  : Refrigerant loss is not exceeded  as per Table 1 :

   Top up missing refrigerant

   It is not permitted  to top up the refrigerant oil

   Case 2  : Loss of refrigerant per Table 1  is exceeded  :

   Top up missing refrigerant

   Refrigerant oil must be topped up additionally  as per Table 2 

   Table 1/case 1
   Number of years since last filling	0-1	1-2	2-3	3-4	4-5
   Permissible loss [g] --> Do not top up refrigerant oil	≤ 30	≤ 60	≤ 90	≤ 120	≤ 150

   Table 2/case 2
   Number of years since last filling	Loss of refrigerant [g]	Top up quantity refrigerant oil
   0-1	< 120	0
   0-1	120-150	10
   0-1	> 150	20
   1-2	< 180	0
   1-2	180-210	10
   1-2	> 210	20
   2-3	< 240	0
   2-3	240-270	10
   2-3	> 270	20

   Table 2/case 2
   3-4	< 300	0
   3-4	300-330	10
   3-4	> 330	20
   4-5	< 360	10
   4-5	> 360	20

   • Add refrigerant oil as per the table if parts of the refrigerant circuit have been replaced: 

   Case 1  : Part exchange as preliminary work for additional work and part exchange due to slow leakage  (minor leak, e.g. hairline crack)

   Case 2  : Part exchange due to sudden leakage  (major leak, e.g. line disconnection caused by accident)

   	Case 1	Case 2
   Air conditioning compressor(1)	(1)	(1)
   Evaporator	10 ml	35 ml
   Capacitor without integrated desiccant insert	20 ml	35 ml
   Capacitor 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 amount of refrigerant oil into the refrigerant circuit.
   • Fill the amount of refrigerant as per the type plate into the refrigerant circuit.
   • Disconnect the high pressure line and low pressure line on the motor vehicle.
   • Drain the high pressure line and low pressure line.
   • Once again close the refrigerant filler neck on the motor vehicle with the sealing caps.
     Fig 3: Filling Air Conditioning System

     Courtesy of BMW OF NORTH AMERICA, INC.