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Here is the procedure for removing and replacing the thermostat in your vehicle. Unfortunately you have to loosen the intake manifold in order to remove and replace the thermostat.
Important: The SUV thermostat housing is different from L-Series.
Tighten Tighten the thermostat housing bolts 20 N·m (15 lb ft).
Important: The correct stack up should be cylinder, head, engine lift bracket, coolant extension housing
Tighten Tighten the coolant pipe engine bracket bolt to 20 N·m (15 lb ft).
Caution: Do not allow smoking or the use of open flames in the area where work on the fuel or EVAP system is taking place. Anytime work is being done on the fuel system, disconnect the negative battery cable, except for those tests where battery voltage is required.
Caution: Whenever fuel line fittings are loosened or disconnected, wrap a shop cloth around the fitting to collect fuel. Place the cloth in an approved container.
Important: To remove the 5 upper manifold bolts, use a 1/4 inch drive T-30 TORX and long 1/4 inch drive extension.
Important: Do not over torque the intake manifold spacer plate bolts.
Tighten Tighten the bolts to 16 N·m (11 lb ft).
Important: Do not over torque the intake manifold bolts.
Tighten Tighten the bolts to 7.5 N·m (66 lb in).
Tighten Tighten the throttle body-to-intake manifold bolts to 7.5 N·m (66 lb in).
Tighten Tighten the outlet resonator duct nuts to 5 N·m (44 lb in).
Important: An audible click noise can be heard when the fuel line is installed. Slightly pull rearward on line to assure the connection is fully seated.
Tighten Tighten the outlet resonator duct-to-bracket nuts to 10 N·m (89 lb in).