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It is located under the thermostat housing. You can trace the radiator hose all the way to the housing, however removing the thermostat is not as easy. Here are the instructions.
Disconnect negative cable from remote jumper terminal.
Drain cooling system.
Raise and safely support the vehicle.
Remove the right front wheel and belt splash shield.
Remove the accessory drive belts.
Remove the lower alternator mounting bolt.
Disconnect alternator electrical connectors.
Disconnect AC clutch and AC pressure sensor electrical connectors. Reposition wiring harness.
Remove the oil dipstick and tube. Plug hole in oil pan where dipstick tube mounts with water tight stopper.
If hole for dipstick tube in oil pan is not plugged, coolant will enter oil pan. Serious engine damage can occur.
Remove the remaining alternator mounting bolts. Remove alternator.
Disconnect hoses at thermostat housing.
Remove the thermostat housing bolts.
Remove the thermostat and housing.
Air bleed valve (1) and thermostat housing (2) 2.7L-engine
Clean gasket sealing surfaces.
Install the thermostat and gasket into the thermostat housing.
Make sure spring side of thermostat faces the engine side.
Install the thermostat with the air bleed valve located at the 12 o'clock position.
Install the thermostat and housing to cylinder block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
Connect hoses at thermostat housing.
Install the alternator and attaching bolts.
Clean residual coolant from area around hole for dipstick.
Remove the plug in oil pan and install the engine oil dipstick tube.
Reconnect AC clutch and AC pressure sensor connectors.
Reconnect alternator connectors.
Install the accessory drive belts.
Install the belt splash shield and right front wheel.
Reconnect negative battery cable.
Fill cooling system.