Sentra L4-2.0L (MR20DE) (2010)
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Install thermostat while making rubber ring (1) groove fit to thermostat flange (A) around the whole circumference.
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Install thermostat (1) into the thermostat housing (2) with jiggle valve (A) facing upwards.
Thermostat Housing
CAUTION:
Replace the rubber ring with a new one.
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Securely insert the rubber ring into the mating groove of thermostat housing and install it.
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Install the thermostat housing to the cylinder block without displacing the gasket from the gasket position.
INSPECTION AFTER INSTALLATION
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Check for leaks of engine coolant. See: Coolant/Service and Repair/Inspection.
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Start and warm up the engine. Visually check for engine coolant leaks.