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Disconnect the negative battery cable.
Remove the ignition coil.
Drain and recycle the engine coolant.
Remove the water inlet pipe on models with a manual transaxle.
Remove the oil cooler if equipped with an automatic transaxle.
Remove the thermostat housing bolts and the housing.
Remove the thermostat and gasket.
Clean the gasket mating surfaces.
Installation is the reverse of a removal. Always use a new gasket and verify that the jiggle pin is aligned with the projection of the thermostat gasket as illustrated.
Install the thermostat into the thermostat case, aligning the projection on the gasket to the thermostat case as illustrated.
Tighten the housing to the specifications in the illustration.
Check and fill the cooling system.
Exploded view of the thermostat assembly-626 with the 2.5L (KL) engine
Verify that the jiggle pin is aligned with the projection of the thermostat gasket as illustrated-626
Install the thermostat into the thermostat case, aligning the projection on the gasket to the thermostat
2003 Jetta left rear window blue plastic part of the