Here are step by step instructions on how to drain the coolant from a 1996 Chevy 6.5 Turbo Diesel:
1. Park your vehicle on a level surface.
2. Turn off the engine and allow it to cool down completely.
3. Open the hood of your vehicle.
4. Locate the lower radiator hose. It is the thicker hose on the bottom of the radiator.
5. Place a drain pan under the radiator hose.
6. Loosen the hose clamp that secures the lower radiator hose to the radiator.
7. Remove the lower radiator hose.
8. The radiator coolant will begin to drain from the radiator.
9. Allow all of the coolant to drain from the radiator.
10. Once the radiator is drained, reattach the lower radiator hose and tighten the hose clamp.
11. Fill the radiator with new coolant.
12. Start the engine and allow it to run for a few minutes.
13. Check the coolant level and add more coolant if necessary.