Different engine options are used in the Chevrolet avalanche. However, if you would like to change or tighten the coolant hoses, the steps you require are basically the same and the process requires about half an hour only. The process is relatively simple and you need just a few basic tools. These are pliers, screwdriver, knife, and catch can or bucket.

The simple steps required are as follows:

1. Allow the engine to cool down for a minimum of an hour if you have just driven the car.
2. The radiator cover is held in place with three bolts that you will need to remove it before lifting the shroud from the engine.
3. Remove the radiator cap.
4. Put a catch can or bucket below the drain plug.
5. Drain coolant into the catch can sufficiently to allow you to remove the hose without much leakage.
6. Use the nut driver to loosen the screw hose clamps and pliers to open spring clamps.
7. Slide the clamps to the center of the hose.
8. Release the ends of the hose from the nipple by pulling and twisting if necessary. There are times when the hose may fail to budge even when you twist it, in which case you will need to cut the ends and peel it away from the connection.
10. Slide the clamps onto the new hose, whose ends you should dip into clean coolant.
11. Fix the hose onto the nipple by pushing or twisting it around. Be aware that some hoses go only one way because of the different sizes at the ends.
12. Use either the nut driver or pliers to tighten the clamps into place. Do not tighten them too much, or you risk damaging either the connection or hose.
13. You may need to close the drain plug prior to filling the radiator with coolant.
14. Replace the radiator cap.
15. Check for any leakage after starting the car. It may be necessary to add coolant.
16. Put back the shroud to cover the cooling system and fix it in place using the three screws.