Cooling System Components Overview, Engine Side
Cooling System Components Overview, Engine Side
Part 1
Part 2
1 Cylinder Block
2 Engine Oil Cooler
3 Bolt
• 25 Nm
4 Bolt/Nut
• 10 Nm
5 to the Bottom Heater Core Connection
6 Guide Tube
• For the oil dipstick.
7 Pre-Warmer
• Not available in the US/Canadian market.
8 Bolt
• 25 Nm
9 O-ring
• Always replace.
10 Retaining Clip
• Make sure it is secure.
11 Front Coolant Line
12 Connecting Hose
13 Thermostat Housing Cover
14 to the Lower 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 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 O-ring
• Replace
24 Bolt
• 9 Nm
25 Coolant Hose
• To the front coolant line.
• To the bottom expansion tank connection.
26 Bolt
• 10 Nm
27 Coolant Pump
• With a integrated silicone seal for the cylinder block.
• Removing and installing, refer to => [ Coolant Pump ] Service and Repair.
Part 2
Part 1
1 Coolant Adapter
• Pressed into the cylinder head.
• Clean before installing the flange => [ (Item 18) 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 18) Flange ].
4 to the Top Expansion Tank Connection
5 Rear Coolant Line
6 Bracket
• For the heated oxygen sensor (G39).
7 Bolt/Nut
• 10 Nm
8 Heat Shield
9 to the Top Heater Core Connection
10 Supply Hose
11 By-Pass Thermostat
• Only for vehicles with a automatic transmission.
• Assembly, refer to => [ By-Pass Thermostat, Overview ].
• Checking
12 to the Transmission Fluid Cooler
• Only for vehicles with a automatic transmission.
13 from the Bottom Heater Core Connection
14 from the Transmission Fluid Cooler
• Only for vehicles with a automatic transmission.
15 Return Hose
16 Coolant Line
• Bolted to the flange => [ (Item 18) Flange ].
17 to the Coolant Thermostat Housing
18 Flange
19 to the Top Radiator Connection
20 to the Top Radiator Connection
21 Supply Hose
22 Engine Coolant Temperature Sensor (G62)
23 O-ring
• Always replace.
24 Retaining Clip
• Make sure it is secure.
By-Pass Thermostat, Overview
1 Spring bracket
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 in a hot water bath.
Starts to open: approximately 75 °C (167 °F)
Opening end: approximately 85 °C 185 °F)
Opens: approximately 5 mm