Liberty, Wrangler 2006-2007

Removal & Installation

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Fig. The removal of the thermostat from its housing on the 4.0L engine

  1. Drain cooling system below thermostat housing level.
  2.  
  3. Disconnect engine coolant temperature sensor.
  4.  
  5. Disconnect heater supply hose.
  6.  
  7. Remove housing attaching bolts .
  8.  
  9. Remove housing, gasket and thermostat.
  10.  

To install:

  1. Install the replacement thermostat so that the pellet, which is encircled by a coil spring, faces the engine. All thermostats are marked on the outer flange to indicate the proper installed position.
  2.  
  3. Observe the recess groove in the engine cylinder head .
  4.  
  5. Position thermostat into this groove with arrow and air bleed hole on outer flange pointing up.
  6.  
  7. Install replacement gasket and thermostat housing
    CAUTION
    Tightening the thermostat housing unevenly or with the thermostat out of its recess may result in a cracked housing.

  8.  
  9. Tighten the housing bolts to 15 ft. lbs. (20 Nm) torque.
  10.  
  11. Install hoses to thermostat housing.
  12.  
  13. Install electrical connector to coolant temperature sensor.
  14.  
  15. Be sure that the radiator draincock is tightly closed. Fill the cooling system.
  16.  
  17. Start and warm the engine. Check for leaks
  18.  


WARNING
Do not loosen radiator drain cock with system hot and pressurized. Serious burns from coolant can occur.


NOTE
Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

2.4L Engine





Click image to see an enlarged view

Fig. The removal of the thermostat from its housing

  1. Drain cooling system below thermostat housing level.
  2.  
  3. Disconnect engine coolant temperature sensor.
  4.  
  5. Disconnect heater supply hose.
  6.  
  7. Remove housing attaching bolts .
  8.  
  9. Remove housing, gasket and thermostat .
  10.  

To install:

  1. Clean all gasket sealing surfaces.
  2.  
  3. Place a new gasket (dipped in clean water) on the coolant outlet connector surface. Position thermostat with air bleed at 12 o-clock position in thermostat housing.
  4.  
  5. Position the coolant outlet connector and gasket over the thermostat, making sure thermostat is seated in the thermostat housing .
  6.  
  7. Position outlet connector to thermostat housing and install bolts. Tighten bolts to 20 ft. lbs. (28 Nm).
  8.  
  9. Install radiator hose to coolant outlet housing.
  10.  
  11. Connect engine coolant temperature sensor.
  12.  
  13. Fill cooling system.
  14.  

2.8L Diesel Engine




NOTE
The thermostat is not serviced separately. The thermostat and housing must be replaced as an assembly.

  1. Disconnect negative battery cable.
  2.  
  3. Remove engine cover.
  4.  
  5. Partially drain cooling system.
  6.  
  7. Disconnect upper radiator hose and bypass hoses at thermostat housing.
  8.  
  9. Remove thermostat housing retaining bolts, support bracket and housing from cylinder head, discard gasket .
  10.  

To install:

  1. Clean old gasket material from cylinder head and thermostat housing.
  2.  
  3. Install thermostat housing with gasket and support bracket to cylinder head. Torque bolts to 20 ft. lbs. (27.5 Nm).
  4.  
  5. Connect coolant bypass hose and upper radiator hose to thermostat housing.
  6.  
  7. Refill cooling system.
  8.  
  9. Install engine cover.
  10.  
  11. Connect negative battery cable.
  12.  

3.7L Engine



  1. Disconnect negative battery cable at battery.
  2.  
  3. Drain cooling system.
  4.  
  5. Raise vehicle on hoist.
  6.  
  7. Remove splash shield.
  8.  
  9. Remove lower radiator hose clamp and lower radiator hose at thermostat housing.
  10.  
  11. Remove thermostat housing mounting bolts, thermostat housing and thermostat .

    Click image to see an enlarged view

    Fig. The location of the thermostat and its housing on the 3.7L engine

  12.  

To install:

  1. Clean mating areas of timing chain cover and thermostat housing.
  2.  
  3. Install thermostat (spring side down) into recessed machined groove on housing assembly. Make sure rubber seal locating tab is positioned in the corresponding notch in the housing.
  4.  
  5. Position thermostat housing on timing chain cover.
  6.  
  7. Install two housing-to-timing chain cover bolts. Tighten bolts to 105 inch lbs. (12 Nm) torque.
  8.  
  9. Install lower radiator hose on thermostat housing.
  10.  
  11. Install splash shield.
  12.  
  13. Lower vehicle.
  14.  
  15. Fill cooling system.
  16.  
  17. Connect negative battery cable to battery.
  18.  
  19. Start and warm the engine. Check for leaks.
  20.  

 
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