Ram Truck 1500, 2500 & 3500 (2006-2008)

Removal & Installation

Print

3.7L & 4.7L Engines




CAUTION
Do not loosen the radiator draincock with the cooling system hot and pressurized. Serious burns from the coolant can occur.

Do not waste reusable coolant. If the solution is clean, drain the coolant into a clean container for reuse.

If the thermostat is being replaced, be sure that the replacement is the specified thermostat for the vehicle model and engine type.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the cooling system.
  6.  
  7. Raise and support the vehicle.
  8.  
  9. Remove the splash shield.
  10.  
  11. Remove the lower radiator hose clamp and the lower radiator hose at the thermostat housing.
  12.  
  13. Remove the thermostat housing mounting bolts, thermostat housing and thermostat.

    Click image to see an enlarged view

    Fig. Location of the thermostat (2), thermostat housing (1), thermostat & gasket (3) and timing chain cover (4)-3.7L & 4.7L engines

  14.  

To install:

  1. Clean the mating areas of the timing chain cover and the thermostat housing.
  2.  
  3. Install the thermostat (spring side down) into the recessed machined groove on the timing chain cover.
  4.  
  5. Position the thermostat housing on the timing chain cover.
  6.  
  7. Install the housing-to-timing chain cover bolts. Tighten the bolts to 112 inch lbs. (13 Nm).
    WARNING
    The housing must be tightened evenly and the thermostat must be centered into the recessed groove in the timing chain cover. If not, it may result in a cracked housing, damaged timing chain cover threads or coolant leaks.

  8.  
  9. Install the lower radiator hose on the thermostat housing.
  10.  
  11. Install the splash shield.
  12.  
  13. Lower the vehicle.
  14.  
  15. Fill the cooling system.
  16.  
  17. Connect negative battery cable.
  18.  
  19. Start and warm the engine. Check for leaks.
  20.  

5.7L Engines




CAUTION
Do not loosen the radiator draincock with the cooling system hot and pressurized. serious burns from the coolant can occur.

Do not waste reusable coolant. If the solution is clean, drain the coolant into a clean container for reuse.

If the thermostat is being replaced, be sure that the replacement is the specified thermostat for the vehicle model and engine type.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the cooling system
  6.  
  7. Remove the radiator hose clamp and radiator hose at the thermostat housing.
  8.  
  9. Remove the thermostat housing mounting bolts, thermostat housing and thermostat .

    Click image to see an enlarged view

    Fig. View of the retaining bolt (1), thermostat housing (2), clamp (3) and radiator hose (4)-5.7L engine

  10.  

To install:

  1. Position the thermostat and housing on the front cover.
  2.  
  3. Install the thermostat housing bolts. Tighten the bolts to 112 inch lbs. (13 Nm).
  4.  
  5. Install the radiator hose onto the thermostat housing.
  6.  
  7. Fill the cooling system.
  8.  
  9. Connect negative battery cable.
  10.  
  11. Start and warm the engine. Check for leaks.
  12.  

5.9L Engine



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the battery negative cables.
  4.  
  5. Drain cooling system until coolant level is below thermostat
  6.  
  7. Remove radiator hose clamp and hose from thermostat housing.
  8.  
  9. Remove the three water thermostat housing bolts and remove thermostat housing.

    Click image to see an enlarged view

    Fig. 5.9L Engine thermostat, housing, and bolts

  10.  
  11. Clean the mating surfaces of thermostat housing and clean the thermostat seat groove at the top of the thermostat housing.
    NOTE
    The thermostat for 5.9L engine and the 6.7L are different and are not interchangeable. Use caution when replacing the thermostat to ensure the proper part number is reinstalled.

  12.  
  13. Inspect the thermostat seal for cuts or nicks. Replace if damaged.
  14.  
  15. Install the thermostat into the groove in the top of the cylinder head
  16.  
  17. Install the thermostat housing and bolts. Tighten the bolts to 89 in. lbs. (10 Nm).
  18.  
  19. Install the radiator upper hose and clamp.
  20.  
  21. Fill the cooling system.
  22.  
  23. Connect the battery negative cables.
  24.  
  25. Start the engine and check for coolant leaks. Run engine to check for proper thermostat operation.
  26.  

6.7L Engine



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the battery negative cables.
  4.  
  5. Remove vent plug near EGR cooler.
  6.  
  7. Drain cooling system until coolant level is below the thermostat.
  8.  
  9. Disconnect exhaust gas pressure sensor electrical connector.
  10.  
  11. Remove exhaust pressure tube from thermostat housing.
  12.  
  13. Remove EGR cooler cross over tube.
  14.  
  15. Remove radiator hose clamp and hose from thermostat housing.
  16.  
  17. Remove heat shield.
  18.  
  19. Remove the three water outlet-to-cylinder head bolts and remove the water outlet connector.
  20.  
  21. Clean the mating surfaces of the thermostat housing and clean the thermostat seat groove at the top of the thermostat housing.

    Click image to see an enlarged view

    Fig. 6.7L Engine thermostat housing and related parts

  22.  

To install:

  1. Inspect the thermostat seal for cuts or nicks. Replace if damaged.
  2.  
  3. Install the thermostat into the groove in the top of the cylinder head.
  4.  
  5. Install the thermostat housing and bolts. Tighten the bolts to 89 inch lbs. (10 Nm).
  6.  
  7. Install heat shield. Tighten bolts to 79 in. lbs. (9 Nm).
  8.  
  9. Install exhaust pressure tube. Tighten to 88 inch lbs. (10 Nm).
  10.  
  11. Connect exhaust pressure sensor electrical connector.
  12.  
  13. Install EGR cross over tube.
  14.  
  15. Install the P-clip and bolt. Tighten to 70 inch lbs. (8 Nm).
  16.  
  17. Install the radiator upper hose and clamp.
  18.  
  19. Fill the cooling system with coolant.
  20.  
  21. Connect the battery negative cables.
  22.  
  23. Start the engine and check for coolant leaks. Run engine to check for proper thermostat operation.
  24.  

 
label.common.footer.alt.autozoneLogo