How much anti freeze to fill?

This query was asked for 2003 Chevrolet silverado 2500hd crew cab Duramax engine.
As per this models capacity,it holds almost 5 gallons of Antifreeze Plus water mixed.
To fill this Antifreeze and water mixture take the rad cap off and on the back side of the passengers rad tank at the bottom is a valve.Open that and let it drain.
When you fill it there is a bolt on the thermostat housing you remove to bleed the air out.Don't forget to bleed the air in the line.If the bubbles gets created then antifreeze gets blocked and cooling problems will be noticed.

Hope all goes well.This details will help.Thanks.

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