Ram B1500, B2500, B3500, 1999-2003

Hoses

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The system should be completely drained and refilled at least every two years in order to remove accumulated rust, scale and other deposits.


NOTE
Ensure that the engine is completely cool prior to starting this service.

  1. Remove the radiator and overflow tank caps.
  2.  
  3. Place a drain pan of sufficient capacity under the radiator and open the petcock (drain).
  4.  


NOTE
The petcock may be plastic and should be handled carefully. Before opening the radiator petcock, spray it with some penetrating lubricant.

  1. Drain the coolant from the engine block either by removing the drain plug or disconnecting the lower radiator hose.
  2.  
  3. When the system is completely drained, close the petcock and fill the system with a radiator flush. Clean water may also be used, but is not as efficient.
  4.  
  5. Idle the engine until the upper radiator hose gets hot. Be sure to put the heater on to circulate the water or cleaning fluid through the entire system.
  6.  
  7. Allow the engine to cool and drain the system again.
  8.  
  9. Repeat this process until the drained water is clear and free of scale.
  10.  
  11. Flush the overflow tank with water and leave it empty.
  12.  


NOTE
If you decide to add the antifreeze and water separately (instead of pre-mixing them), be sure that you add a sufficient amount of antifreeze, before topping off with water. Add a half-gallon of each at a time so that you won't find yourself with a filled system with too much of one or the other.

  1. Determine the capacity of the coolant system, then properly refill the cooling system with a 50/50 mixture of fresh coolant (antifreeze and water), as follows:
    1. Fill the radiator with coolant mixture until it reaches the radiator filler neck seat.
    2.  
    3. Start the engine and allow it to idle (heater on) until the thermostat opens (the upper radiator hose will become hot).
    4.  
    5. Turn the engine OFF and refill the radiator until the coolant level is at the filler neck seat.
    6.  
    7. Fill the overflow tank with the coolant mixture until the level is midway between the upper and lower level marks, then install the radiator cap.
    8.  

  2.  
  3. If available, install a pressure tester and check for leaks. If a pressure tester is not available, run the engine until normal operating temperature is reached (allowing the system to naturally pressurize), then check for leaks.
  4.  
  5. Check the level of protection with an antifreeze/coolant hydrometer.
  6.  
  7. After the system has cycled between operating temperature and cold a couple of times, check the overflow tank level and top up if needed.
  8.  



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Fig. Only remove the radiator cap when the engine is cool



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Fig. Radiator petcock components



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Fig. Cylinder block drain plug location (1)-typical



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Fig. Fill the system, run the engine, then check and top off as necessary

 
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