How to change the antifreeze in an o1?

[duramax-rob]

I'm going to change the antifreeze in my 01 and wondering if any one has a suggested or favorite way to do this task. I'm assuming that I can use the orange color 5 year antifreeze that i get from the parts store will work.

Should I flush the system with water like stated in another thread? Also what about getting rid of any airpockets in the system. Are thier any drain plugs in the block to drain or just do it without using the block drain plugs.

Any help would be greatly appreciated. Thanks alot.

[jaydawg]

If you undo the cap and loosen the radiator drain plug on the pass. side, u will drain about 3 gallons out of the system. On top of the t-stat housing is a 12mm bleed screw. Pull it out when refilling the system. This is how I do it when I have to replace injectors.

[Tow Master]

I do what jaydog said if you just want to change the antifreeze. Personally Id remove the upper rad hose from the rad and the lower rad hose from the rad or motor. Drain the antifreeze then use a garden hose and run water throught the block rad, and overflow jug. Then connect hoses fill with water and start truck. Let run till thermostat opens then do over again. After that you could use green or orange antifreeze. The orange is known to eat aluminum so getting all the old stuff out will go a long way

[duramax-rob]

Thanks for the replies. Going to try to do it tomorrow. The help is appriciated and will be used.