Remove/install electric motor cooling coolant pump - AR20.10-P-1276MEZ
ENGINE 780.993 in MODEL 451.390/392/490/492 2#
Shown with a removed cooling module
| Risk of death when touching components on vehicles with high-voltage on-board electrical system | Do not touch components and open lines of the high-voltage on-board electrical system. Persons who wear electronic implants (e.g. cardiac pacemakers), must not carry out any work on high-voltage on-board electrical systems. | AS54.00-Z-0001-01A | |
| Risk of explosion caused by welding or soldering work on closed air conditioning system. Risk of poisoning caused by inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with liquid refrigerant. | Do not perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated areas. Carry out repair work on the air conditioning system circuit only after the system has been drained. | AS83.00-Z-0001-01A | |
| Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from swallowing coolant. | Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. |
AS20.00-Z-0001-01A | |
| Note on high-voltage on-board electrical system | AH54.00-P-0010-01A | ||
| Protect air conditioning circuit and components from moisture when carrying out repair work | AH83.30-N-0005-01A | ||
| Notes on coolant | AH20.00-N-2080-01A | ||
| Information on preventing damage to electronic components due to electrostatic discharge | AH54.00-P-0001-01A | ||
| Notes on handling refrigerant R134a | AH83.30-N-0003-01A | ||
| Remove/install | |||
| 1 | Remove transmitter key and mains plug | ||
| 2 | Remove front module | AR62.30-P-1575MCC | |
| 3 | Drain air conditioning system | AR83.30-P-1760MCC | |
| 4 | Disconnect air conditioning service unit | ||
| 000 588 04 82 00 Air conditioning service unit | WS83.00-P-0031B | ||
| 5 | Unscrew nut (3) | ||
| 6 | Disconnect refrigerant lines (4) from condenser | ||
| Compressor oils (specification 362.0) | MB 362.0 compressor oil A 001 989 08 03 | ||
| 7 | Secure cooling module (1) with cable tie (2) against falling down | ||
| 8 | Swivel cooler module (1) to the front right in the direction of the arrow outwards | ||
| 9 | Release and disconnect electrical connection (5) for electric drive coolant pump and charger (M46) | ||
| 10 | Remove screw/bolt (6) | ||
| 11 | Remove mounting frame bow (7) and take off electric drive coolant pump and onboard charger (M46) | ||
| 12 | Clamp off coolant hoses (9) on electric drive coolant pump and charger (M46) with clamping devices | Figure | |
| 13 | Unfasten clamps (8) using hose clamp pliers and push to the rear onto the coolant hoses (9) | Figure | |
| 14 | Detach coolant hoses (9) from connection fitting and remove electric drive coolant pump and charger (M46) | ||
| 15 | Install new desiccant cartridge | AR83.30-P-6525MCC | |
| 16 | Install in the reverse order | ||
| 17 | Bleed cooling system with Star Diagnosis | ||
| AD00.00-P-2000-04MCC | |||
| AR20.00-P-1142-06MEX | |||
| Figure | |||
| Figure | |||
| 18 | Check cooling system for leaktightness | AR20.00-P-1010MCC |