Cooling System Components Assembly Overview, Engine Side
Cooling System Components Overview, Engine Side
Part 1
1 Cylinder block
2 Oil cooler
3 Bolt, 25 Nm
4 Bolt, 10 Nm
5 To heater core of heater, bottom
6 Retaining clip
7 O-ring
• Always replace.
8 Front coolant line
9 Connecting hose
10 O-ring
• Always replace
11 Coolant line
12 Connecting hose
13 Connecting piece
14 To radiator, bottom
15 Bolt, 5 Nm
16 O-ring
• Always replace.
17 Coolant thermostat
• Removing and installing, refer to --> [ Coolant Thermostat ] Service and Repair.
• Note installation position:
Valve must be at top
• Checking (coolant thermostat installed):
Refer to --> 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
• Always replace.
19 Bolt, 25 Nm
20 Coolant thermostat housing
21 Seal
• Always replace.
22 Accessory bracket
23 Bolt, 10 Nm
24 Coolant pump
• With integrated silicone sealing ring for the cylinder block seal.
• Removing and installing, refer to --> [ Coolant Pump ] Service and Repair.
25 Right coolant line
• Secured to the engine mount.
26 To expansion tank, bottom
Part 2
For part 1.
1 Coolant connection
• Pressed into the cylinder head.
• Clean before installing coolant distribution housing - item 17 -.
- If necessary, remove coolant deposits using a copper wire brush or fine sandpaper (minimum 100 grit).
• If the pipe connection is worn, replace it using locking fluid (D 000600 A2).
2 Circlip
3 Seal
• Replace after removing coolant distribution housing - item 17 -.
4 To expansion tank, top
5 Rear coolant pipe
6 Bolt/Nut, 10 Nm
7 Heat shield
8 To heater core, top
9 Supply hose
10 Bypass thermostat
• Only for vehicles with automatic transmission.
• Assembly overview, refer to --> [ Bypass Thermostat Assembly Overview ]
• Checking.
11 To Automatic Transmission Fluid (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 pipe
• Bolted to the coolant distribution housing - item 17 -.
16 To coolant distribution housing
17 Coolant distribution housing
18 Supply hose
19 To top of radiator
20 Coolant hoses
• Only for the throttle valve control module heated by coolant.
21 Throttle valve control module (J338)
22 Engine Coolant Temperature (ECT) sensor (G62)
23 O-ring
• Always replace.
24 Retaining clip
Bypass Thermostat Assembly Overview
1 Spring bracket
2 Lower part of housing
Note installation position: Arrow points toward the 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 hot water.
Starts to open: approximately 75 °C.
Opening end: approximately 85 °C.
Opens: approximately 5 mm.