Flush refrigerant line between the compressor and condenser using a suction and
pressure syringe and commercially available acetone. The acetone dissolves the
refrigerant oil in the air-conditioning line.

2.2.3

Allow the acetone to dry off in the refrigerant line.

2.2.4

Wrap bright fabric around the refrigerant line connection between the compressor
and condenser and secure it on the line with a tie-wrap.

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WARNING
Working with compressed air
•

Risk of eye injuries

•

Risk of damaging and dirtying components



Wear protective goggles with side eye protection.



Protect the point at which the compressed air emerges with suitable material.



Place the point at which the compressed air emerges on suitable surfaces.

2.3

2.2.5

Blow out refrigerant line between the compressor and condenser using pure
compressed air (with NO oil or water mixed in).

2.2.6

Replace condenser and desiccator.

2.2.7

Install refrigerant line between the compressor and condenser.

Replace desiccator.

NOTICE
Too much or too little refrigerant oil in air conditioning circuit
•

Reduced cooling output

•

Lack of lubrication and failure of the air conditioning compressor



If a new air conditioning compressor or a component in the circuit is replaced, the oil quantity must be
checked and adjusted.
3

Check and measure the refrigerant oil level in the air-conditioning compressor/cooling system
3.1

3.2

ONLY for air-conditioning compressor WITHOUT oil drain plug:
Measure refrigerant oil quantity of "old" air-conditioning compressor.
3.1.1

Open the oil filler screw on the air-conditioning compressor.

3.1.2

Fill refrigerant oil from the air-conditioning compressor into a measuring cylinder.
Turn the pressure plate on the air-conditioning compressor (not the pulley) when
emptying refrigerant oil.

3.1.3

Take note of the measured refrigerant oil quantity (Vold).

Check the refrigerant oil quantity of the total system (Vtotal = 170 cm³) and add refrigerant oil
if necessary.
3.2.1

Calculate the refrigerant oil quantity of the total system (air conditioning) = Vtotal
using the following formula:
Vtotal = Vcompressor new + (Vremoved + Vold) + Vsafety

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•
•

Vtotal = Filling capacity 170 cm³
Vsafety = Filling capacity 20 cm³

Sample calculation:
Vtotal (170 cm³) = Vcompressor new (135 cm³) + Vremoved(X1) + Vold(X2) + Vsafety(20
cm³)
3.3

Fill the air-conditioning compressor
Information

4

•

New air-conditioning compressors are pressurised and filled with the total oil quantity required
for the refrigerant circuit!

•

The remaining oil quantity in the individual components must therefore be cleaned out!

•

Refrigerant oil from the compressor or refrigerant oil removed by suction from a previously run
air-conditioning system may no longer be used (special-category waste)!

Install new air-conditioning compressor.
4.1

Fit new air-conditioning compressor on the air-conditioning compressor plate and align it.

4.2

Screw on air-conditioning compressor securely using three new hexagon-head bolts (M8 x
110) and three washers (8.4 x 18 x 2).
Hexagon-head bolt, M8 x 110: Tightening torque 22 Nm (16 ftlb.) +/-2 Nm
(+/-1.5 ftlb.)

4.3

Fit new V-belt on pulley and push air-conditioning compressor as far as possible to the right.

4.4

Tension V-belt using the tension screw and tighten lock nut on air-conditioning compressor
plate.

4.5

Tighten three hexagon-head bolts (M8 x 35) and one M8 hexagon nut on the air-conditioning
compressor plate.
Hexagon-head bolt, M8 x 35/hexagon nut, M8: Tightening torque 22 Nm (16 ftlb.)
+/-2 Nm (+/-1.5 ftlb.)

4.6

Screw hose connections onto the air-conditioning compressor.
Suction connection (thread: 7/8 inch x 14 UNF): Tightening torque 33 Nm (24 ftlb.)
+/-4 Nm (+/-3 ftlb.)
Pressure connection (thread: 3/4 inch x 16 UNF): Tightening torque 24 Nm (18 ftlb.)
+/-4 Nm (+/-3 ftlb.)

4.7
5

Fill air conditioning system and perform function test
5.1

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Connect electric plug connection for the air-conditioning compressor.

Connect high-pressure line and low-pressure line from the air-conditioning service station to
the respective valve.

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Fill in refrigerant oil
5.2.1

ONLY for equipment WITH integrated oil filling system:
•
•

5.2.2

Enter the measured refrigerant oil quantity.
Allow the equipment to take in the refrigerant oil.

ONLY for equipment WITHOUT integrated oil filling system:
•
•
•

5.3

ENU

Start the vacuum pump
At the start of the vacuum phase, add the measured quantity of refrigerant oil
using an oil injector or a hose disconnected from the servicing equipment.
Re-connect the hose to the servicing equipment immediately after adding the
oil.

Evacuate the air-conditioning system
5.3.1

Evacuate the air-conditioning system for at least 20 minutes.

5.3.2

If the air-conditioning system was open for a long time, evacuate the system for up
to 120 minutes.

NOTICE
Excessively high pressure in refrigerant circuit
•

Risk of damage to air-conditioning compressor



Do not allow the low-pressure gauge to exceed Nominal value 3 barat any time.
5.4

Fill the air-conditioning system
5.4.1

Using the servicing equipment, add the refrigerant quantity stated in the manual
into the air-conditioning lines.
Refrigerant quantity: Filling capacity 975 g +/-25 g

5.4.2

Start the engine and carry out a leak test.

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5.4.3

Check the performance of the
new air-conditioning compressor
( Figure 7 ).
1
2
•

•

– Low-pressure display
– High-pressure display
Low pressure at an engine
speed of approx. 950 – 2,000
rpm = approx. 14.5 – 29 psi
(1.0 – 2.0 bar)
High pressure at an engine
speed of approx. 950 – 2,000
rpm = approx. 174–290 psi
(12.0 – 20.0 bar)

To reach the high pressure
values, switch off/disconnect the
condenser blower if necessary.
5.4.4

Temperature measurement on
dashboard
•

6

Figure 7

Temperature difference in the
center vent area (dashboard)
after approx. 20 minutes =
approx. 41° F (5° C)

Concluding work
6.1

Disconnect high-pressure line and
low-pressure line from the air-conditioning
service station.

6.2

Screw protection caps (black) onto the
respective valve.

Figure 8

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87 03 17 00:

–Refrigerant drained and filled–
Includes:
Checking leak-tightness using leak tester.
Checking cooling output of air-conditioning system.
Without:
Draining and filling refrigerant. Separate LO no.!

87 34 19 00:

–Compressor removed and installed–
Includes:
Loosening and securing refrigerant hoses.
Without:
Draining and filling refrigerant. Separate LO no.!

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Labor time: 130 TU

Labor time: 50 TU

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. If a particular condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your authorized Porsche Dealer for the latest information
about whether a particular technical bulletin applies to your vehicle. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify the current and
correct part numbers. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS
Tester are the ones that must be followed.
© 2018 Porsche Cars North America, Inc.

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