Removing and engine installing coolant thermostat - AR20.10-P-2460HA

ENGINE 602.982, 604, 605, 606 / (except, 606.964) 

Fig 1: Locating Coolant Thermostat Housing, Coolant Thermostat And O-Ring

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing, installing
	Risk of injury  to skin and eyes from scalding from hot coolant which splashes out. Risk of poisoning  from swallowing coolant	Do not open the expansion reservoir cap or radiator cap unless the coolant temperature is below 90°C. Unscrew cap carefully up to the first pre-dentent or slowly approx. 1/2 turns. Wear protective clothes.	AS20.00-Z-0001-01A
1	Drain coolant	at radiator and crankcase	AR20.00-P-1142HW
2	Remove coolant thermostat housing (17)		*WH58.30-Z-1001-06A
			*WH58.30-Z-1002-06A
3	Remove coolant thermostat (20)	Installation:  The indentation on the coolant thermostat (20) must align with the rib on the coolant thermostat housing (17) (arrow). Replace O-ring (19).
4	Install in reverse order	Check cooling system for leaks	AR20.00-P-1010HA

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