Checking the Cooling System

Checking the Cooling System - Ops - DD5

Check the cooling system as follows:

  1. Make sure all drain cocks in the cooling system are installed (drain cocks are often removed for shipping) and are closed tightly.
  2. Fill the coolant overflow surge tank with Detroit™ Genuine Coolant until coolant level stays between the low and full coolant marks on the tank.
  3. Entrapped air must be purged after filling the cooling system. To do this, allow the engine to warm up with the pressure cap removed. With the transmission in neutral, increase engine speed to 1000 rpm and add coolant to the surge tank as required.
  4. Check to make sure the front of the radiator and charge air cooler (if equipped) are unblocked and free of debris.
Note:
Parent topic: System Checks
Document Number: 0000035879
Manual Publication Date: 2024-01-05
Topic Publication Date: 2023-03-28