2 | Engine radiator |
3 | Drain screw |
G20.00-3132-11
Shown on engine 471.9 |
4 | Fuel filter module |
5 | Coolant drain fitting (on crankcase) |
W20.00-1059-11
Warning | Risk of injury. Skin or eye injuries may result when handling hot or glowing objects. | Wear protective gloves, protective clothing and safety glasses, if necessary. | |
Warning | 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. | |
Warning | Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. 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. | |
Topical note | Notes on avoiding damage through contamination and foreign objects | ||
Drain off | |||
1 | Remove cap of coolant expansion reservoir and relieve overpressure in cooling circuit | For installation location of coolant expansion reservoir, see information of bodybuilder. | |
2 | Set heater to the max. heat output and switch on ignition | Only for engine with heating system. | |
3 | Make a filling unit available | ||
| 000 588 02 82 00 Filling unit | ||
4 | Open drain screw (3), drain coolant at radiator (2) and collect with filling unit | Catch coolant with filling unit only. The coolant will be cleaned through a filter during filling. | |
5 | Attach drain hose to coolant drain fitting (5) | Use a commercially available hose as a drain hose. | |
6 | Open coolant drain fitting (5), drain engine coolant and collect with filling unit | ||
7 | Switch off ignition | ||
8 | Remove drain hose and tighten down coolant drain fitting (5) | ENGINE 470.9Coolant drain fitting to oil/coolant module | |
ENGINE 471.9, 473.9Coolant drain fitting to crankcase | |||
9 | Tighten drain screw (3) on engine radiator (2) | Drain screw to engine radiator | |
| Check | ||
10 | Check drained off coolant for contamination | In the case of strong fouling, the coolant must generally be replaced. | |
If the coolant is dirt-laden too strongly. | |||
| |||
Deoil engine cooling system. | |||
11 | Check coolant with an antifreeze tester | See information from body manufacturer. | |
When antifreeze protection is too low | |||
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Correct concentration of antifreeze or replace the coolant. | |||
Filling and bleed using the diagnostic system | |||
12 | Connect diagnostic system, select filling of the coolant circuit and start | ||
| Coolant specifications | ||
| Anticorrosion agent/antifreeze (specification 325.5) | ||
| Premixed coolant (specification 326.5) | ||
| 000 588 02 82 00 Filling unit | ||
| |||
Connect vehicle diagnosis system, see information of bodybuilder. | |||
The process is completely menu-assisted under: | |||
Only fill coolant with filling unit. The coolant will be cleaned through a filter during filling. | |||
13 | Stop diagnostic system and disconnect | ||
| Check | ||
14 | Check engine cooling system for leaktightness | Visual inspection. |