911 (930)

Technical Information

149/18 ENU

8734

8

Air-Conditioning Compressor (Model Year '78 – '83 Vehicles)

Information
Due to restricted master data in the system, this document is ONLY displayed for vehicles from model
year 1984 (E).
However, this document is ALSO relevant for vehicles from model year 1978!
Vehicle type:

911 Turbo (930)

Model Year:

As of 1984

Information:

Replacing air-conditioning compressor during repairs

Note:

If a faulty air-conditioning compressor ( Figure 1) for the 911 Turbo (930) needs to be replaced, an
air-conditioning compressor of similar design is available.
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
Part Info:

930.126.010.02

1x

Air-conditioning compressor set, complete with compressor plate

AfterSales

Mar 24, 2020
Page 1 of 12

8

911 (930)

Technical Information

ENU 149/18

8734

Parts List:

1
2
3

Figure 2
– Air-conditioning compressor  Figure 2 -1– Compressor plate  Figure 2 -2– Guide sleeves  Figure 2 -3-

When replacing the air-conditioning compressor, we recommend that you install a new V-belt.

Materials:

Tools:

999.192.173.50

1x

V-belt

000.043.305.79

1x

Refrigerant oil (as required)

———

1x

Refrigerant R134a, approx. 875 +/- 25 g

Air conditioning service unit R134a or
Air conditioning service unit R134a
Rubber gloves (commercially available)
Protective goggles (commercially available)
Thermometer

WARNING
Refrigerant
•

Danger of freezing



Avoid contact with refrigerant.



Wear personal protective gear.



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

Mar 24, 2020
Page 2 of 12

AfterSales

911 (930)

Technical Information

149/18 ENU



Observe the safety regulations for extraction and filling systems.



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

Work Procedure: 1

8734

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.

AfterSales

Mar 24, 2020
Page 3 of 12

8

911 (930)
8734

Technical Information

ENU 149/18

1.1.3

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

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

Mar 24, 2020
Page 4 of 12

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 Step 3.1

Removing air conditioning compressor

AfterSales

911 (930)

Technical Information
1.2.1

149/18 ENU

8734

8

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

– High-pressure connection
– Low-pressure connection

Figure 4
1.2.2

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

1.2.3

1.2.4

– Tension screw
– Hexagon-head bolt, M8 x
20
– Hexagon-head bolt, M8 x
20
– Hexagon-head bolt, M8 x
20
– Electric plug connection

Loosen 2 hexagon-head bolts (M10
x 50) and 2 hexagon-head bolts
(M10 x 25) on the stud on the
air-conditioning compressor plate
( Figure 5 ).
Figure 5
Then LOOSEN lock nut (1 x) on the
tension screw on the air-conditioning compressor plate and unscrew tension screw
( Figure 5 ).

AfterSales

Mar 24, 2020
Page 5 of 12

8

911 (930)
8734

Technical Information

ENU 149/18

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 5 ).

1.2.6

Remove 2 hexagon-head bolts (
Figure 6 -1 and 2-) at the pulley
(M10 x 25) and 2 hexagon-head
bolts on the guide sleeves (M10 x
50) on the compressor.

1.2.7

Take air-conditioning compressor
down off the air-conditioning
compressor plate.

Figure 6
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.

Mar 24, 2020
Page 6 of 12

AfterSales

911 (930)

Technical Information

149/18 ENU

8734

8

A clean measuring cylinder with a capacity of approx. 300 ml is required.
1

– Screws on air-conditioning
compressor plate (
Figure 9 -1-).

Figure 7
1.2.8

Remove 3 hexagon-head bolts (
Figure 7 -1-) and remove air-conditioning compressor retainer plate.
1

1.2.9

2

– Guide sleeves for air-conditioning compressor

Press guide sleeves at the left
and right ( Figure 8 -1-) into the
mounting points of the retainer
plate. Adapt the press-in depth of
the bushes as required so that the
compressor fits perfectly.

Figure 8