Cooling System Components, Engine Side Assembly Overview
Cooling System Components, Engine Side Assembly Overview
Part 1
Part 2
1 Cylinder block
2 Oil cooler
3 25 Nm
4 10 Nm
5 To heater core of heater, bottom
6 Retaining clip
7 O-ring
• Replace
8 Front coolant line
9 Connecting hose
10 O-ring
• Replace
11 Coolant line
12 Connecting hose
13 Connecting piece
14 To radiator, bottom
15 5 Nm
16 O-ring
• Replace
17 Coolant thermostat
• Removing and installing => [ Coolant Thermostat ] Coolant Thermostat
• Note installation position:
Valve must be at top
• Checking (coolant thermostat installed):
=> Vehicle diagnosis, testing and information system (VAS 5051) "Guided Functions ".
• Checking (coolant thermostat removed):
Heat up thermostat in water
Starts to open: approximately 87 °C End of opening: approximately 102 °C Open distance: at least 7 mm
18 Seal
• Replace
19 25 Nm
20 Coolant thermostat housing
21 Seal
• Replace
22 Bracket for assemblies
23 10 Nm
24 Coolant pump
• With integrated silicone sealing ring for the cylinder block seal
• Removing and installing => [ Coolant Pump ] Service and Repair
25 Right coolant line
• Secured to engine mount
26 To expansion tank, bottom
Part 2
Part 1
1 Coolant connection
• Pressed in cylinder head
• Clean before installing coolant distribution housing => [ (Item 17) Coolant distribution housing ]
- If necessary, remove coolant deposits using a copper wire brush or fine sandpaper (minimum 100 grit).
• If pipe connection is worn, replace it using locking fluid (D 000600 A2).
2 Circlip
3 Seal
• Replace after removing coolant distribution housing => [ (Item 17) Coolant distribution housing ]
4 To expansion tank, top
5 Rear coolant pipe
6 10 Nm
7 Heat shielding
8 To heater core, top
9 Supply hose
10 Bypass Thermostat
• Only for vehicles with automatic transmission
• Assembly overview => [ Bypass thermostat - assembly overview ]
• Checking
11 To ATF cooler
• Only for vehicles with automatic transmission
12 To heater core, bottom
13 From ATF cooler
• Only for vehicles with automatic transmission
14 Return hose
15 Coolant line
• Bolted to coolant regulator housing => [ (Item 17) Coolant distribution housing ]
16 To coolant regulator housing
17 Coolant distribution housing
18 Supply hose
19 To top of radiator
20 Coolant hoses
• Only for Throttle Valve Control Module (J338) heated by coolant
21 Throttle valve control module (J338)
22 Engine Coolant Temperature (ECT) Sensor (G62 )
23 O-ring
• Replace
24 Retaining clip
Bypass thermostat - assembly overview
1 Spring bracket
2 Lower part of housing
Note installation position: Arrow points toward ATF cooler
3 Operating element
4 Spring
5 O-ring
6 Upper part of housing
Checking bypass thermostat
- Remove operating element - 3 - and heat in a hot water bath.
Starts to open: approximately 75 °C
Opening end: approximately 85 °C
Opens: approximately 5 mm