Thermostat Removal and Installation: Installation

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Install the thermostat into the thermostat housing by pressing the thermostat mounting flange downward and then rotating the flange counterclockwise. Rotate the thermostat mounting flange until it is seated in the thermostat housing recesses.
Coat the sealing surface of a new seal ring with Lubricator®.
Install a new seal ring into the recess in the thermostat housing.

Fig 1: Identifying Thermostat Housing And Cylinder Head Mating Surfaces (2 Of 2)
Courtesy of SUZUKI OF AMERICA CORP.
Install the thermostat housing to the cylinder head.
Secure the thermostat housing to the cylinder head with the mounting bolts.
Tighten:

Tighten the thermostat housing mounting bolts to 15 N.m (11 lb-ft).

Fig 2: Identifying Thermostat Housing Mounting Bolts
Courtesy of SUZUKI OF AMERICA CORP.
Connect the upper radiator hose to the thermostat housing.
Secure the upper radiator hose to the thermostat housing with a hose clamp.
Refill the engine cooling system. Refer to Draining and Refilling the Cooling System .

Fig 3: Identifying Hose Clamp On Upper Radiator Hose At Thermostat Housing
Courtesy of SUZUKI OF AMERICA CORP.