REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mercedes-Benz G-Class (W463, 1999 issue)

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Mercedes-Benz
	G-class
		Introduction
		Controls and operation receptions
		Current care and maintenance
		Engine
		System of cooling, heating, ventilation and air conditioning
			Engine cooling system
				Antifreeze - a means of protection against freezing
				Changing the coolant - general comments
				Check the cover of the cooling system, replacement of coolant hoses
				Check thermostat
				Removing and installing thermostat
				Removing and installing radiator cooling system
				Removal and installation of the expansion tank
				Removal and installation of the cooling fan assembly
				Removal and installation of the water pump
				Removal and installation of low-temperature cooler (M612)
				Removal and installation of an engine block heater (with appropriate equipment)
				Removing and installing auxiliary heater STH (with appropriate equipment)
				Removing and installing auxiliary heater circulation pump STH (with appropriate equipment)
			Ventilation systems, heating and air conditioning
		The power supply system and exhaust
		Systems of an electric motor
		Automatic Transmission
		Transmission Line
		Brakes and auxiliary systems
		Suspension and steering
		Body
		Onboard electric
		Wiring

Removing and installing auxiliary heater circulation pump STH (with appropriate equipment)

Details of the installation of the circulating pump (models 463.250 / 323, code H12)


3 - Return hose treatise cooling (heating) 4 - The inlet hose cooling path 5 - Cover heater 8 - Connector wiring of circulation pump	13 - Mounting bracket 17 - Bolt A6 - Additional heater STH A6m1 - Circulation pump

PERFORMANCE ORDER

Opening the cover of the expansion tank, release pressure in the cooling system.
Remove assemblage of additional heater STH (see. Section Removal and installation of auxiliary heater STH (with appropriate equipment)).
Disconnect the wiring connector (8) of the circulation pump - connector has an asymmetrical shape, which guarantees the uniqueness of his connections.
Remove the retaining screw (17), remove the clamp (13) and remove the assembly of the circulating pump (A6m1), disconnect it from the supply hose (4).
Installation is in the reverse order.
Finally, remove the air from the path of the cooling system and check the corresponding components for signs of leaks, then make sure of serviceability of functioning of the additional heater STH (see. Section Removal and installation of auxiliary heater STH (with appropriate equipment)).