Ford 2003 Mustang Workshop Manual page 1574

68. NOTE: Lubricate the O-ring with clean engine coolant.
Install the heater water inlet tube.
69. NOTE: Lubricate the O-rings with clean engine coolant.
Install the heater water outlet tube and the mounting bolts.
70. NOTE: Inspect the intake manifold gaskets and install new gaskets, if necessary.
Install the intake manifold, supercharger and fuel supply manifold as an assembly, and tighten
the bolts to 10 Nm (89 lb-in) in the sequence shown.