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20 Engine Cooling - M117 4.5 Liter

Cooling system

• 20-005 - Coolant circuit and engine cooling
• 20-010 - Draining and filling-in of coolant - anti-freeze table
• 20-015 - Cleaning the cooling system

Coolant thermostat

• 20-110 - Removal and installation of coolant thermostat

Coolant pump

• 20-210 - Removal and installation of coolant pump
• 20-225 - Sealing of coolant pump

Viscofan clutch, temperature controlled

• 20-310 - Viscofan coupling, temperature-controlled
• 20-320 - Viscofan coupling, speed-controlled

Radiator

• 20-420 - Removal and installation of radiator
• 20-430 - Checking radiator or expansion tank cap  

More information

• Oil in cooling system? After repair, use Alkaline cleaner, Disodium trioxosilicate, pentahydrate.
  • Part number is 001 986 21 71 (500 grams)
• Scale in cooling system? Use Citric Acid at 100 grams per liter.
  • Part number is 000 989 10 25 (500 grams)
• Cooling System Diagnostics

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