Cooling System Components, Engine Side
Cooling System Components, Engine Side
Part 1
1 Cylinder Block
2 Oil Cooler
3 Bolt, 25 Nm
4 Bolt/Nut, 10 Nm
5 to Heater Core, Bottom
6 Retaining Clip
• Check clip for secure seating.
7 O-ring
• Replace
8 Front Coolant Line
9 O-ring
• Replace
10 Coolant Line
11 Connecting Hose
12 Connecting Piece
13 to Radiator, Bottom
14 Bolt, 5 Nm
15 O-ring
• Replace
16 Coolant Thermostat
• Removal and installation, refer to => [ Coolant Thermostat ] Service and Repair.
• Note the installed position:
Valve must be at top
• Checking, coolant thermostat installed:
=> Vehicle diagnostic tester "Guided Functions"
• Checking, coolant thermostat removed:
Heat up thermostat in water.
Starts to open: approximately 87 °C (188.6 °F) Opening ends: approximately 102 °C (215.6 °F) opening distance: minimum 7 millimeter (mm)
17 Seal
• Replace
18 Bolt, 25 Nm
19 Coolant Thermostat Housing
20 Seal
• Replace
21 Accessory Bracket
22 Bolt, 10 Nm
23 Coolant Pump
• With integrated silicone seal for the cylinder block seal.
• Removal and installation, refer to => [ Coolant Pump ] Service and Repair.
24 Connecting Hose
25 to Expansion Tank, Bottom
Part 2
1 Coolant Connection
• Pressed in 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 connection is worn, replace it using locking fluid (D 000600 A2).
2 Circlip
3 Seal
• Replace after removing the coolant distribution housing - item 17 -.
4 to Expansion Tank, Top
5 Rear Coolant Pipe
6 Bolt/Nut, 10 Nm
7 to Heater Core, Top
8 Supply Hose
9 Bypass Thermostat
• Only for vehicles with a automatic transmission.
• Assembly overview, refer to => [ Bypass Thermostat Assembly Overview ].
10 to Transmission Oil Cooler
• Only for vehicles with a automatic transmission.
11 Supply Hose
12 from Heater Core, Bottom
13 from Transmission Oil Cooler
• Only for vehicles with a automatic transmission.
14 Return Hose
15 Coolant Line
• Bolted to the coolant regulator housing - item 17 -.
16 to Coolant Thermostat 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)
• Connection only for coolant heated throttle valve control module.
22 Engine Coolant Temperature (ECT) Sensor (G62 )
23 O-ring
• Replace
24 Retaining Clip
• Check clip for secure seating.
Bypass Thermostat Assembly Overview
1 Spring bracket
2 Lower part of housing
Note the installed position: The arrow points toward the transmission oil cooler.
3 Operating element
4 Spring
5 O-ring
6 Upper part of housing
Bypass Thermostat, Checking
- Remove the operating element - 3 - and heat in hot water.
Starts to open: approximately 75° C (167° F)
Opening end: approximately 85° C (185° F)
Opens: approximately 5 millimeter (mm)