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Thermostat - 3.9L: Installation

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
    CAUTION: When installing the thermostat into the thermostat housing, make sure to align the thermostat pin with the hole in the housing.
  1. Position the thermostat into the thermostat housing.
    • Be sure to install the small end of the thermostat spring toward the thermostat housing.
  2. CAUTION: After installing the thermostat into the thermostat housing, make sure that the tabs on the thermostat retainer are locked into the tabs on the thermostat housing.
    NOTE: The thermostat can be rotated in either direction to install it in the thermostat housing.
  3. Using an 18 mm (0.7 in) open end wrench, simultaneously push down and turn the thermostat retainer to install the thermostat in the housing.
  4. Install the thermostat housing. For additional information, refer to THERMOSTAT HOUSING - 3.9L  .
  5. Fill and bleed the cooling system. For additional information, refer to COOLING SYSTEM DRAINING, FILLING AND BLEEDING  .