For 1990-2009 cars

1. Remove the coolant outlet assembly bolts.
2. Remove the coolant outlet assembly.
3. Remove the thermostat.
4. Remove the heater inlet pipe nipple.
5. Remove the engine coolant temperature sensor.
6. Remove the intake manifold coolant pipe retaining screw.
7. Carefully pry out the intake manifold coolant pipe from the lower intake manifold.
8. Discard the intake manifold coolant pipe.