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## 20 Cooling System - M104

- Cooling System Diagnostic

> 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

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

> 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

> 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)

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Copyright © 2003, 2004, 2005, 2006 Steve Nervig.
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