Checking the Coolant Level (Hot Check)

Checking the Coolant Level (Hot Check) - Gen 5 DD15 - Ops - #7628

Check the coolant levels as follows:

  1. Allow the engine to run for approximately five minutes at a moderate speed.
  2. After the coolant temperature reaches 50°C (122°F), recheck the coolant level in the surge tank. The cooling system is correctly filled when the coolant is between the full and low marks on the surge tank.
  3. Stop the engine and allow it to cool down. If necessary, fill the surge tank with approved coolant; see How to Select Coolants. Do not overfill the cooling system as overfilling will cause the surge tank to push coolant out of the overflow.
Note:
EA5,EB6
Parent topic: How to Check the Coolant Level
Document Number: 0000009801
Manual Publication Date: 2025-08-26
Topic Publication Date: 2026-02-05