A/C System Capacity - Quick Charge Check (83/40)
Publication date: 1992-12-01Reference number: 83/40
A/C SYSTEM CAPACITY - QUICK CHARGE CHECK
TECHNICAL SERVICE BULLETIN
Reference Number(s): 83/40, Date of Issue:
February 1992
MODEL 140
A. AIR CONDITIONING SYSTEM CAPACITY
B. QUICK CHARGE CHECK
C. TORQUE SPECIFICATIONS
Model(s): 1992-on Mercedes-Benz 300 SD, 300 SE, 400 SE, 500 SEL, 600 SEL
Group: 83 - Climate Control System, Automatic/Tempmatic A/C
Bulletin No.: MBNA 83/40
Date: February 1992
A. R134A (NON-CFC) REFRIGERANT CAPACITY
R134A (NON-CFC) REFRIGERANT CAPACITY
| Model | Capacity |
|---|---|
| 140 w/o rear A/C | 1200g |
| 140 w/ rear A/C | 1400g |
B. QUICK CHARGE CHECK
- Clean sight glass on receiver/drier. See Fig 1 . Additional access can be gained by removing left side headlamp bulb access cover.
- Disconnect connector from coolant temperature sensor B10/8 and bridge connector terminals with jumper wire. See Fig 2 3 and 4.
- With engine idling, switch on automatic climate control (DEF).
- Observe sight glass through opening in radiator support (arrow) and simultaneously remove jumper wire from connector. See Fig 5 .
Refrigerant should rise soon after the compressor clutch engages. The flow should be free of bubbles or foam (refrigerant is clear).
NOTE:
An accurate check of the charge is not always possible using the sight glass. At higher ambient temperatures (greater than 35°C) some bubbles may be visible even with correct fill quantity.
When there is a loss of refrigerant or system leaks are suspected, the correct charge can only be ensured by completely evacuating (recycling) and refilling system. System should first be checked for leaks. The correct charge can only be established by weighing the refrigerant or by using a recharging cylinder or automatic air conditioning recharging station.
C. A/C SYSTEM CONNECTIONS/TORQUE SPECIFICATIONS
Refer to Fig 6 .
A/C SYSTEM COMPONENT LOCATIONS
Refer to Fig 7 .