- 1). Remove the thermostat intake housing from the intake manifold of the Jetta by removing the 10 millimeter bolts that hold it into place. The thermostat intake housing can be located easily by finding the point where the radiator hose connects to the intake manifold. The metal housing the hose connects to is the thermostat intake housing.
- 2). Pull the old thermostat out of the intake manifold and then place a new one into the intake with the end marked "top" facing upward.
- 3). Lift the old thermostat gasket off of the intake manifold and discard it.
- 4). Place a bead of RTV silicone on the base of the intake manifold and set the thermostat gasket on top of it. Place a bead of silicone on the bottom edge of the thermostat intake housing and place the housing on top of the thermostat gasket. Bolt the housing back into place.
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