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Remove/install coolant thermostat - AR20.10-P-2460GZ

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ENGINE 113.964 in MODEL 164.175 

Fig 1: Identifying Coolant Thermostat Components
G05257750Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
REMOVINGINSTALLING Remove/Install    
DANGER Risk of injury  to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning  from swallowing coolant. Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage bottles.
Wear protective gloves, protective clothing and eye protection.		 AS20.00-Z-0001-01A 
1 Drain the coolant from radiator   AR20.00-P-1142GZ 
2 Unclip cover on engine firewall side See ↓  
    Remove air filter housing AR09.10-P-1150GZ
3 Dismount coolant hose (5) IMPORTANT Inspect condition of coolant hose (5) and hose clamp (4), replace if necessary.  
    COMMERCIALLY AVAILABLE TOOLS 7 mm socket hexagon *WH58.30-Z-1002-06A 
    COMMERCIALLY AVAILABLE TOOLS 6 mm socket hexagon *WH58.30-Z-1001-06A 
4 Unscrew bolts (3), remove coolant thermostat housing (1) with coolant thermostat NOTES The coolant thermostat must not be removed from the housing. If this is done it will be destroyed. Re-installation is not possible. The housing is supplied together with the coolant thermostat for repair purposes.
IMPORTANTInstallation:  Install new sealing ring (2).		  
    TORQUE SPECIFICATION *BA20.10-P-1003-01C 
    SPECIAL TOOL External Torx set Fig 2
5 Install in the reverse order    
6 Inspect cooling system for leaks   AR20.00-P-1010GZ 
DANGER Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near engine Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.		 AS00.00-Z-0005-01A
7 Conduct engine test run and check the engine for leaks NOTES In the event of oil loss determine and eliminate cause, otherwise malfunctions, transmission damage, and serious environmental pollution may occur.  
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation Engine 113.964/971
BA20.10-P-1003-01C Bolt of coolant thermostat housing M6 Nm 10
Fig 2: Identifying External Torx Set (001 589 76 09 00)
G05257751Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
COMMERCIALLY AVAILABLE TOOLS

Number Designation
WH58.30-Z-1001-06A 6 mm socket hexagon on flexible shaft for hose clamps with worm drive
WH58.30-Z-1002-06A 7 mm socket hexagon on flexible shaft for hose clamps with worm drive
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