20 Cooling System - M104

Maintenance Jobs - 1990 through 1993

• 2010 - Checking coolant level/antifreeze protection
• 2011 - Checking coolant level
• 2050 - Checking cooling and heating system
• 2080 - Replacing coolant

Maintenance Jobs - 1994 through 1995

• 2010 - Checking coolant level/antifreeze protection
• 2080 - Replacing coolant

  Service Information

• 20.1 - Installation Instructions, Coolant Pre-heater, Model 124

Additional Information

• Cooling System Diagnostic
• 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)

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Cooling system

• 20-0020 - Switching points in the cooling system
• 20-0050 - Cooling circuit
• 20-0060 - Operation of engine off cooling
• 20-0100 - Draining, pouring in coolant - Antifreeze protection table
• 20-0150 - Flushing cooling and heating system
• 20-0160 - Removing oil in cooling and heating system
• 20-0170 - Testing cooling system for leaks
• 20-1000 - Removing and installing coolant connection fitting at front cover

Cooling thermostat

• 20-1100 - Removing and installing coolant thermostat

Cooling pump

• 20-2100 - Removing and installing coolant pump
• 20-2110 - Replacing connecting pipe from cylinder head coolant pump
• 20-2250 - Sealing coolant pump
• 20-2255 - Retrofitting coolant pump drain pipe
• 20-2300 - Removing and installing coolant pipe from heat exchanger to coolant pump

Fan couplings

• 20-3100 - Temperature-controlled viscous fan clutch
• 20-3120 - Removing and installing viscous fan clutch
• 20-3140 - Removing and installing viscous fan clutch bearing bracket
• 20-3400 - Removing and installing, adjusting fan shroud

Radiator

• 20-4200 - Removing and installing radiator
• 20-4300 - Testing cooling system pressure cap
• 20-4450 - Function of electrical coolant level indicator
• 20-4500 - Removing and installing expansion reservoir
• 20-4540 - Removing and installing overflow reservoir

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