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8

Air-Conditioning Compressor

Vehicle Type:

911 Carrera (911)/911 Targa (911)/911 Speedster (911)

Model Year:

As of 1984 up to 1989

Concern:

Replacing air-conditioning compressor during repairs

Notes:

If a faulty air-conditioning compressor ( Figure 1) for the 911 needs to be replaced, an air-conditioning
compressor of similar design is available. The new air-conditioning compressor must ONLY be used with
the new V-belt. Please remember this when ordering parts!
All connections and fastening points are the same as on the standard air-conditioning compressor. There
is no need to change the high-pressure/low-pressure lines!

Figure 1
Parts Info:

930.126.021.07

1x

 Air-conditioning compressor –complete–, set

999.192.247.50

1x

 V-belt

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Parts List:

Figure 2
———

1x

PCG.126.021.07

1x

Air-conditioning compressor assembly (ASSY) incl. connections,
filled with approx. 135 ccm of refrigerant oil (PAG 100)  Figure 2
-1Assembly kit, comprising:
3 x Hexagon-head bolt, M8 x 110 – DIN 931  Figure 2 -23 x Washer, 8.4 x 18 x 2 – DIN 134  Figure 2 -3-

Materials:

Tools:

000.043.305.79

1x

Refrigerant oil (as required)

———

1x

Refrigerant R134a, approx. 975 +/- 25 g

VAS 6746 - Air-conditioning service station or
VAS 6853 - Air-Conditioning service station
Rubber gloves (commercially available)
Protective goggles (commercially available)
Thermometer

WARNING
Refrigerant
•

Danger of freezing



Avoid contact with refrigerant.



Wear personal protective gear.

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

Observe the safety regulations for working on air-conditioned vehicles and dealing with refrigerant.



Observe the safety regulations for extraction and filling systems.



Observe the instructions for repairing air conditioning systems and storing spare parts.

Work Procedure: 1

8

Preparatory work
Information

1.1

•

On air-conditioning service equipment with a transparent oil separator, read and take
note of the oil level before removing refrigerant.

•

Do not carry out this step on empty air-conditioning systems (pressure gauge approx. 0
psi/bar) because if you do, air will get into the refrigerant bottle.

•

If the vehicle is cold, it may be necessary to repeat the suction procedure until all
refrigerant has been removed from the air-conditioning system. This step is carried out
automatically with some units.

Drain refrigerant
1.1.1

Start the engine and switch on air conditioning. Leave the engine running for a
short time.
To achieve maximum air conditioning performance: switch off fresh-air and warm
air flow.
Information
•

1.1.2

If the air-conditioning compressor is blocked or seized up, then additional
steps must be carried out to ensure that the air-conditioning system is
working. See section on Work steps for blocked or seized up air-conditioning compressor

Check that the air conditioning is working in order to determine whether additional
maintenance and repair work (e.g. faulty lines, etc.) is required.

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1.1.3

Unscrew protection cap (red/blue)
from the valves ( Figure 3 ).
1
2
3

– High pressure: Protection
cap –red–
– Low pressure: Protection
cap –blue–
– Air-conditioning
compressor
Information

•

Before connecting
high-pressure and
low-pressure lines to the
vehicle, remove any refrigerant
in the lines by suction.

•

Be careful of the sealing
rings when disconnecting or
connecting the hose connections!

Figure 3

1.1.4

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

1.1.5

Remove refrigerant by suction.
Drain the removed quantity using the servicing equipment if necessary and
measure it.

1.1.6

Extract and measure refrigerant oil (Vremoved).
If not enough refrigerant oil was removed or separated, proceed as follows
depending on the type of air-conditioning compressor:
•
•

1.2

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Air-conditioning compressor WITH oil drain plug: Drain refrigerant oil via the
oil drain plug and measure it (Vold).
Air-conditioning compressor WITHOUT oil drain plug: Continue with the next
step

Removing air conditioning compressor

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Technical Information
1.2.1

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Unscrew hose connections. Close
off connections and lines using
stoppers ( Figure 4 ).
1
2

– Low-pressure connection
– High-pressure connection

Figure 4
1.2.2

Disconnect electric plug connection
for the air-conditioning compressor
( Figure 5 ).
1
2
3
4
5
6

1.2.3

1.2.4

– Electric plug connection
– Hexagon-head bolt, M8 x
35
– Hexagon nut M8
– Air-conditioning
compressor plate
– Lock nut
– Tension screw

Figure 5
Loosen three hexagon-head bolts
(M8 x 35) and one M8 hexagon nut on the stud on the air-conditioning compressor
plate ( Figure 5 ).
Then LOOSEN lock nut (1 x) on the tension screw on the air-conditioning
compressor plate and unscrew tension screw ( Figure 5 ).

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1.2.5

Push air-conditioning compressor
plate with air-conditioning
compressor as far as possible to
the left and take the V-belt down off
the pulley ( Figure 6 ).
1
2
3

– Air-conditioning
compressor plate
– Hexagon-head bolt, M8 x
110
– Air-conditioning
compressor
Figure 6

1.2.6

Remove hexagon-head bolt (3 x) on
the compressor ( Figure 6 ).

1.2.7

Take air-conditioning compressor down off the air-conditioning compressor plate.
Information
All connection points must be completely dirt-free.
The air-conditioning compressor must be dry (washing the vehicle) and the
air-conditioning compressor and lines must be free of moisture.
The connection points must be closed after they have been opened. Use the
original transport caps.
A clean measuring cylinder with a capacity of approx. 300 ml is required.

2

Work steps for blocked/seized up air-conditioning compressor
2.1

Remove desiccator.

2.2

Check connections on the condenser, on the desiccator and at the refrigerant lines for the
desiccator for signs of wear/chips.
Is there wear/chips?
•
•

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YES: Continue with 2.2.1
NO: Continue with 2.3

2.2.1

Remove refrigerant line between compressor and condenser.

2.2.2