Lili

Air temperature at center nozzle vs. ambient temperature

87 01 19 Dismantling and assembling heater/ A/C unit

No.

Designation

Removal

Installation

1

Tensioning spring

32

2

Screw

11

3

Screw

9

4

Washer

6

5

Bracket

1

6

Knurled nut

2

7

Housing cover LH Housing cover RH

1 1

8

Particle filter LH Particle filter RH

1 1

9

Lever

1

10

Evaporator temperature sensor

1

Built into wiring harness

Built into wiring harness

11

G rammet

1

12

Cover

13

Hexagon socket head screw M 5

2

14

Retaining plate

1

15

Expansion valve

1

16

Gasket

1

Replace. Apply a thin coat of refrigerant oil.

17

Gasket

1

Replace. Apply a thin coat of refrigerant oil.

18

Evaporator

1

Do not damage fins

Do not damage fins

19

Link

1

20

Gasket

1

21

Deleted

22

Deleted

No.

Designation

Removal

Installation

46

Screw

2

47

Temperature sensor, mixing chamber

2

Built into wiring harness

Built into wiring harness

48

Deleted

49

Gasket

1

50

Housing upper section

1

51

Blower LH

White plastic

Blower RH

1

Black pastic

X

Screw (Torx T 20)

4

52

Rubber mount

8

53

Sealing ring

1

54

Retaining clamp

1

55

Linkage

1

56

Lever

1

57

Drive

2

58

Tie-wrap

2

59

Bracket

2

60

Sealing ring

2

61

Water drain tube

1

62

Water drain tube

1

63

Spacer

1

64

Bracket

2

65

Seal

2

66

Water drain tube

1

67

Bracket

1

68

Water drain tube

1

69

Rubber mount

1

70

Gasket

1

71

Housing lower section

1

Modifications to heater / A/C unit from model year '95

Electrically controlled bypass air flaps

A solenoid valve controls the vacuum capsule of the bypass air flaps. The solenoid valve is mounted on the right of the heater / A/C unit.

2181-87

As a spare part, the vacuum capsule with bypass air flaps is only available as a complete unit. If you need to remove the vacuum capsule with bypass air flaps, the heater / A/C unit must first be emptied and removed.

2182-87

911 Carrera (993)

Air Conditioner

87 02 19 Removing and installing heating and air conditioning control

Use Special Tool V 160 (this code also is the Part No.) to remove the heating and air conditioning control. Supplier: Matra Werke GmbH

1. Insert and engage Special Tool in cutout provided in the heating and air conditioning control.

2. Push out heating and air conditioning control manually from below towards the rear.

3. Disengage 25-pin and 35-pin connector.

Note

Dieselstrasse 30 - 40 D-60314 Frankfurt

254-87

87 83 19 Removing and installing A/C system pressure switch Removal

1. Draw off refrigerant charge with service equipment.

2. Remove cover of heater/ A/C unit (2 screws with washers).

3. Pull off connector at pressure switch.

4. Loosen and screw out pressure switch. Installation

5. Replace O-ring at pressure switch and coat lightly with refrigerant oil.

Tightening torque: 3 Nm (2 ftlb.)

1796-87

87 03 Safety instructions for handling refrigerant R 134 a

The refrigerant R 134a used in this system is specified as a safety refrigerant. This means that this refrigerant is inflammable, nonexplosive, non-toxic, non-irritating, odorless and tasteless. The following precautions should nevertheless be observed.

1. Avoid any contact with liquid or gaseous refrigerant. Treat all skin areas affected as in the case of frostbite; rinse with cold water immediately and consult a doctor. Wear goggles to protect your eyes. Consult a doctor immediately if refrigerant gets into your eyes. Wear protective gloves to protect your hands.

2. When repairing the A/C system, drain the system and clean the refrigerant. Even non-chlorine refrigerants must never be released into the atmosphere and must be disposed of correctly.

Due to the differing chemical composition, different types of refrigerant must never be mixed with each other (not even in small quantities).

4. Do not throw refrigerant bottles and do not expose filled bottles to direct sunlight or other heat sources for longer periods of time. The maximum admissible temperature of a filled refrigerant bottle must not exceed 45 °C.

3. Never perform welding operations on parts of the closed A/C system or in their immediate vicinity. Heating generates excessive pressure regardless of whether the system is filled with refrigerant or not and may cause system damage or even explosions. R 134 a is completely non-toxic at normal temperatures but will decompose if it gets into contact with flames or if it is exposed to high temperatures.

87 03 17 Servicing the A/C system

Service equipment SECU 134

1 - Low-pressure gauge

2 - High-pressure gauge

3 - Torr gauge

4 - Low-pressure shutoff valve (blue)

5 - High-pressure shutoff valve (red)

6 - Torr gauge shutoff valve (black)

7 - Vacuum pump shutoff valve (yellow)

8 - Low-pressure fitting

9 - High-pressure fitting

10 - Shutoff valve for refrigerant inlet

11 - Shutoff valve for refrigerant outlet

12 - Shutoff valve for refrigerant oil inlet

13 - Refrigerant oil drain valve

14 - Humidity indicator

15 - Vacuum oil tank fitting

16 - Operating hours gauge

17 - SUCTION FINISH (ABSAUGEN ENDE)

warning lamp

18 - SUCTION/PURGE (ABSAUGEN/

REINIGEN) pressure switch

19 - ON/OFF main switch

20 - HEATING (HEIZUNG) pressure switch

21 FAULT (STÖRUNG) warning lamp

22 - VACUUM PUMP (VAKUUMPUMPE)

23 - Filling cylinder with weight scales

24 - Filling cylinder shutoff valve

25 - Filling cylinder high-pressure gauge

26 - Refrigerant oil inlet flange

27 - Refrigerant oil accumulator inspection glass

Note

Observe manufacturer's operating instructions or repair instructions when working on the service equipment.

Assembly operations that require opening the refrigerant system

General sequence of assembly:

The system contents must be disposed of properly after all operations on the A/C system that require opening the refrigerant system. Make sure the relevant safety regula-

To keep dirt and humidity out of the A/C line system, be careful to ensure absolute cleanliness whenever working on the system. Never clean any parts of the system with hot steam. Use only nitrogen for cleaning.

When replacing a component, plug all openings with suitable plugs.

Never use refrigerant R 12 to fill or top up an A/C system designed for R 134 a, not even vice-versa (this is due to the different components and refrigerant oils used).

1. Draw off refrigerant.

2. Remove failed component.

3. Evacuate.

4. Check system for tightness.

5. Flush with refrigerant.

6. Draw off system contents once more.

7. Evacuate.

Check seals when disconnecting or reconnecting hose connections.

A - High pressure B - Low pressure

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