64 53 520 Replacing safety pressure switch
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WARNING:
Risk of injury!
Refrigerant circuit is under high pressure!
Follow safety instructions for handling R 134a refrigerant. , see 64 50... Safety instructions for handling refrigerant R134a .
Follow safety instructions for handling refrigerant oil. , see 64 50... Safety instructions for handling refrigerant oil .
Avoid contact with refrigerant and refrigerant oil.
Refrigerant circuit is under high pressure!
Follow safety instructions for handling R 134a refrigerant. , see 64 50... Safety instructions for handling refrigerant R134a .
Follow safety instructions for handling refrigerant oil. , see 64 50... Safety instructions for handling refrigerant oil .
Avoid contact with refrigerant and refrigerant oil.
IMPORTANT:
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow instructions for opening and replacing parts in refrigerant circuit. See 64 52... Instructions for opening and replacing parts in refrigerant circuit .
If A/C system is opened for more than 24 hours:Replace desiccant insert for A/C system
Restart engine only when A/C system has been correctly filled.
Follow instructions for opening and replacing parts in refrigerant circuit. See 64 52... Instructions for opening and replacing parts in refrigerant circuit .
If A/C system is opened for more than 24 hours:Replace desiccant insert for A/C system
Necessary preliminary tasks:
- Drawing off, evacuating and filling the A/C system are not included in the time value given for this work operation, see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
Disconnect plug connection (1) and release safety pressure switch (2).
Installation:
Moisten sealing ring with refrigerant oil.
Tightening torque 64 53 6AZ , see 64 53 REFRIGERANT LINES AND EXPANSION VALVE .
After installation:
- Evacuate and fill A/C system , see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Check leak-tightness of valve insert with soapy solution
In event of leakage:
- Draw off A/C system, see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Check sealing faces on line and valve insert for damage, replace line or valve insert if necessary
- If necessary, carry out leak detection , see 64 52... Instructions for opening and replacing parts in refrigerant circuit .