Removing, installing and replacing refrigerant pressure transmitter - ra83001400542x(0542)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Model 140
Operation number of operation texts and work units or standard texts and flat rates 83-0584
| Air conditioner | Empty (recycling). |
| Plug (B12) | Disconnect from refrigerant pressure transmitter (B12), by pressing the retaining spring (arrow). |
| Refrigerant pressure transmitter (B12) | Unscrew. |
| Connection in receiver dehydrator | Seal off (parts set 140 830 01 27). |
| Install | In reverse sequence. Lubricate O-ring with compressor oil (refer to note) and tighten the refrigerant pressure transmitter (B12) to 10 ± 4 Nm. |
| Air conditioner | Evacuate, refill, check function and check for leaks; run engine at idle speed only in the first 4 minutes. |
| Function test | Perform by disconnecting plug at coolant temperature sensor B10/8 and setting 310 Ω (stage I) or 250 Ω (stage II) with an ohm decade; switch on ignition and set control unit (KLA) to "Auto". Auxiliary fans rotate clockwise. |
Erase fault memory in the control unit (Diagnosis manual - air conditioning). |
AUXILIARY FANS
| Switching points | 1st stage | 2nd stage | 3rd stage | |
| Refrigerant pressure | bar | 14 On | 17 On | 20 On |
| 12 Off | 14 Off | 17 Off | ||
| Coolant temperature sensor (B10/8) | °C | 100 On | 107 On | 115 On |
| 95 Off | 100 Off | 107 Off | ||
| Actuation of auxiliary fans | V | 7 | 9 | 12 |
In the 1st stage, the auxiliary fans cannot cut in at outside temperatures <+5°C, but do cut in at outside temperature >+10°C.
Parts which have come into contact with compressor oil for R12 or R134a may only be installed in systems operating with the same refrigerant.
Special tool