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Hi. The thermostat is on the bottom radiator hose on the 2.7. Here are the instructions.
WARNING: DO NOT REMOVE PRESSURE CAP OR ANY HOSE WITH THE SYSTEM HOT AND UNDER PRESSURE BECAUSE SERIOUS BURNS FROM COOLANT CAN OCCUR.
WARNING: IF HOLE FOR DIPSTICK TUBE IN OIL PAN IS NOT PLUGGED, COOLANT WILL ENTER OIL PAN. SERIOUS ENGINE DAMAGE CAN OCCUR.
NOTE: Install thermostat with the bleed valve located at the 12 o'clock position.
CAUTION: Before removing plug in oil pan, clean residual coolant from area.