Liberty, Wrangler, 1997-2005

Removal & Installation

Imprimir



Click image to see an enlarged view

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. Positi