Cooling System Components, Engine Side, Assembly Overview
Cooling System Components, Engine Side, Assembly Overview
• Coolant Hose Connection Diagram. Refer to => [ Coolant Hose Connection Diagram ] [1][2]Cooling System.
• Vehicles with an automatic transmission have a by-pass thermostat in the coolant supply hose to the transmission fluid cooler.
By-pass thermostat - assembly overview => [ By-pass thermostat - assembly overview ].
By-pass thermostat, checking
1 To top of the coolant reservoir
2 Coolant connections on the heat exchanger
3 O-ring
• Replace
4 Connector
• For the engine coolant temperature sensor (G62)
• 2-pin
5 Coolant temperature sensor (G62)
6 Retaining clip
• Make sure it is secure
7 From transmission oil cooler
• Only vehicles with automatic transmission
8 40 Nm
9 Coolant line
10 9 Nm
11 O-ring
• Replace
12 Coolant Distribution Housing
13 To transmission oil cooler
• Only vehicles with automatic transmission
14 from lower reservoir
15 Prewarmer
• not installed on all vehicles
• Assembly overview => [ Engine Pre-Heater Assembly Overview ] Service and Repair
16 To the upper radiator connection
17 To the upper radiator connection
18 From the lower radiator connection
19 Engine oil cooler
20 15 Nm
21 Connecting piece
22 Coolant thermostat
• Checking: Heat up thermostat in water
Starts to open: approximately 86 °C
Opening lift: at least 7 mm
• Removing and Installing, refer to => [ Coolant Thermostat, Removing and Installing ] Service and Repair
23 Toothed belt
• Mark direction of rotation before removing
• Check for wear
• Do not kink
• Removing and Installing, refer to => [ Toothed Belt, Removing and Installing ] Service and Repair
24 Coolant pump
• Check for ease of movement
• Replace completely if damaged or leaking
• Removing and Installing, refer to => [ Coolant Pump, Removing and Installing ] Service and Repair
25 15 Nm
26 Rear toothed belt guard
27 20 Nm
28 Throttle valve control module (J338)
By-pass 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
Opening lift: approximately 5 mm