Cooling System Components Overview, Engine Side
Cooling System Components Overview, Engine Side
Part 1
Part 2, refer to.
1 Cylinder Block
2 Oil Cooler
3 Bolt
• 25 Nm
4 Bolt/Nut
• 10 Nm
5 to the Bottom Heater Core Connection
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 Thermostat Housing Cover
14 to the Bottom Radiator Connection
15 Bolt
• 5 Nm
16 O-ring
• Always replace.
17 Coolant Thermostat
• Removing and installing, refer to => [ Coolant Thermostat ] Service and Repair.
• Note the installed position:
The valve must be at the top
• Checking (coolant thermostat installed):
Refer to "Guided Functions" in the vehicle diagnostic tester.
• Checking (coolant thermostat removed):
Heat up the thermostat in water.
Starts to open: approximately 87 °C (188.6 °F) Opening ends: approximately 102 °C (215.6 °F) opening distance: minimum 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 a integrated silicone seal for the cylinder block.
• Removing and installing, refer to => [ Coolant Pump ] Service and Repair.
25 Right Coolant Line
• Secured to the engine mount.
26 to the Bottom Expansion Tank Connection
Part 2
Part 1, refer to.
1 Coolant Adapter
• Pressed into the cylinder head.
• Clean before installing the flange => [ (Item 17) Flange ].
- If necessary, remove coolant deposits using a copper wire brush or fine sandpaper (minimum 100 grit).
• If the adapter is worn, replace it using liquid locking fluid (D 000 600 A2).
2 Circlip
3 Seal
• Replace after removing the flange => [ (Item 17) Flange ].
4 to the Top Expansion Tank Connection
5 Rear Coolant Line
6 Bolt/Nut
• 10 Nm
7 Heat Shield
8 to the Top Heater Core Connection
9 Supply Hose
10 By-Pass Thermostat
• Only for vehicles with a automatic transmission.
• Overview, refer to => [ By-Pass Thermostat Overview ].
• Checking, refer to.
11 to the Transmission Fluid Cooler
• Only for vehicles with a automatic transmission.
12 to the Bottom Heater Core Connection
13 from the Transmission Fluid Cooler
• Only for vehicles with a automatic transmission.
14 Return Hose
15 Coolant Line
• Bolted to the flange => [ (Item 17) Flange ].
16 to the Coolant Thermostat Housing
17 Flange
18 Supply Hose
19 to the Top Radiator Connection
20 Coolant Hoses
• Only for a throttle valve control module heated by coolant.
21 Throttle Valve Control Module (J338)
22 Engine Coolant Temperature Sensor (G62)
23 O-ring
• Always replace.
24 Retaining Clip
By-Pass Thermostat Overview
1 Spring clip
2 Lower part of housing
Note the installed position: Arrow points toward the ATF cooler
3 Operating element
4 Spring
5 O-ring
6 Upper part of housing
By-pass Thermostat, Checking
- Remove the operating element - 3 - and heat it in a hot water bath.
Starts to open: approximately 75 °C (167 °F)
Opening end: approximately 85 °C (185 °F)
Opens: approximately 5 mm