Model | 374.6, 375.3/4, 930, 932, 933, 934, 940, 942, 943, 944, 950, 952, 953, 954, 957, 958.2/4 |
with code H03 (Air conditioning system in cowl) | |
Model | 375.1, 958.0, 970, 972, 974, 975, 976 |
with code H03 (Air conditioning system in cowl) | |
Model | 930, 932, 933, 934, 950, 952, 953, 954 |
with code H07 (Automatic climate control) | |
Model | 930, 932, 933, 934, 950, 954 |
with code H09 (Auxiliary air-conditioning unit) | |
Model | 930, 932, 933, 934 |
with code H01 (Auxiliary air conditioning, thermostat-controlled) |
Model 374.6, 375.3/4, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5, 958.2/4 with code H03 (Air conditioning in front end) |
1 | Suction side testing and filling valve |
2 | Pressure-side testing and filling valve |
W83.30-1061-01
Model 930, 932, 933, 934, 950.0/1/2/3, 952.0/1/2/3, 953.1/3, 954.0/1/2 with code H03 (Air conditioning in front end) or code H07 (Automatic air conditioning) |
1 | Suction side testing and filling valve |
2 | Pressure-side testing and filling valve |
W83.30-1025-01
Model 930, 932, 933, 934 with code H09 (Stationary air conditioner) or code H01 (Stationary air conditioner, temperature-controlled) |
1 | Suction side testing and filling valve |
2 | Pressure-side testing and filling valve |
3 | Fluid reservoir |
W83.30-1046-12
Model 957 with code H03 (Air conditioning in front end) |
1 | Suction side testing and filling valve |
2 | Pressure-side testing and filling valve |
W83.30-1034-01
Model 375.1 with body 375.830 and code H03 (Air conditioning in front end), model 970, 972, 974, 975, 976 with body 972.899 and code H03 (Air conditioning in front end) |
1 | Suction side testing and filling valve |
2 | Pressure-side testing and filling valve |
W83.30-1026-01
Model 375.1 with body 375.850 and code H03 (Air conditioning in front end), model 958.0 with code H03 (Air conditioning in front end), model 970, 972, 974, 975, 976 with body 972.890 and code H03 (Air conditioning in front end) |
1 | Suction side testing and filling valve |
2 | Pressure-side testing and filling valve |
W83.30-1091-11
Danger ! | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
Danger ! | 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. | Never 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. | |
| Procedure for a damaged or leaky air conditioning system | ||
| Protect air conditioning circuit and components from moisture when carrying out repair work | ||
| Notes on handling refrigerant R134a | ||
Draining | |||
1 | Open maintenance flap | ||
2 | Remove trim grille |
| |
Model 374.6, 375.3, 375.4, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 | |||
3 | Remove cap from test and filling valve at intake side (1) and from test and filling valve at pressure side (2) | ||
4 | Connect air conditioning service unit | Pay attention to manufacturer's operating instructions. | |
5 | Energize solenoid valves of stationary air conditioner | Only on vehicles with code H09 (Stationary air conditioner) or code H01 (Stationary air conditioner, temperature-controlled) | |
Model 950, 954 with code H09 (Stationary air conditioner) | |||
Model 930, 932, 933, 934 with code H01 (Stationary air conditioner, temperature-controlled) or code H09 (Stationary air conditioner) | |||
The solenoid valves of the stationary air conditioner must be energized while draining, evacuating and charging. | |||
6 | Drain air conditioning system | ||
7.1 | Replace fluid reservoir (3) | Model 374.6, 375.3/4, 930, 932, 933, 934, 940, 942, 943, 944, 950, 952, 953, 954, 957, 958.2/4 | |
Model 930, 932, 933, 934 | |||
Model 375.4 with body 375.860, model 940, 942, 943, 944 with body 944.890 | |||
Model 374.6, model 375.1 with body 375.830, model 375.3 with body 375.810/820, model 375.4 with body 375.840, model 944 with body 944.899, model 950, 952, 953, 954, 957, 958.2/4, model 970, 972, 974, 975, 976 with body 972.899 | |||
7.2 | Replace drier element | On vehicles with drier element, if the refrigerant circuit is opened. | |
Work instructions have not yet been created. | |||
8 | Determine the amount of the extracted compressor oil | | |
Evacuate | |||
9 | Evacuate air conditioning system | ||
Filling | |||
10 | Add compressor oil | ||
Depending on the findings, in addition to topping up the compressor oil | |||
| |||
correct oil filling capacity after exchanging parts | |||
11 | Charge air conditioning system | Model 374.6, 375.3/4, 930, 932, 933, 934, 940, 942, 943, 944, 950, 952, 953, 954, 957, 958.2/4Refrigerant total filling capacity | |
Model 375.1, 958.0, 970, 972, 974, 975, 976Refrigerant total filling capacity | |||
If a leak in the air conditioning is suspected | |||
| |||
Fill air conditioning with and approved MB leak detector additive | |||
12 | Remove lines for energizing solenoid valve of stationary air conditioner | Only on vehicles with code (H09) Stationary air conditioner or code (H01) Stationary air conditioner, temperature-controlled | |
| Check | ||
13 | Start engine and switch on air conditioning | ||
14 | Check air conditioning for proper operation | Run engine at idle speed for about 4 minutes and check all the component functions which are of relevance for proper operation of the air conditioning system. | |
15 | Switch on stationary air conditioner | Only on vehicles with code H09 (Stationary air conditioner) or code H01 (Stationary air conditioner, temperature-controlled) | |
16 | Check temperature of refrigerant lines at rear panel of outside of cab with hand | Only on vehicles with code H09 (Stationary air conditioner) or code H01 (Stationary air conditioner, temperature-controlled) | |
The refrigerant feed line should be cold and the refrigerant return line warm. | |||
17 | Turn off engine | ||
18 | Check air conditioning system for leaktightness with air conditioning system leak detector | Use UV leak detector kit for air conditioning systems. | |
19 | Remove air conditioning service unit | ||
20 | Install cap on test and filling valve at intake side (1) and test and filling valve at pressure side (2) | ||
21 | Install trim grille |
| |
Model 374.6, 375.3, 375.4, 940, 942, 943, 944, 950.5/6, 952.5/6, 953.6, 954.5 | |||
22 | Close maintenance flap |