Originally Posted by Wm. Lewallen

SMK_Texas,
Here is the procedure for cleaning the cooling system. The ingrediants to use are listed on a thread above.I mixed the entire contents of each container in a plastic bucket and poured it into the reservoir tank. Top off with water.
1.Completly drain coolant. Radiator and block. Drain plug for most diesels is on the lower right side of the block in front of the starter
2. Remove thermostat
3. Fill system with degreaser solution
4. Run engine at operating temp. for five min.
5 Stop engine and let cool to about 122F
6 Completly drain radiator and block.
7.Rinse twice with clear water;run engine warm 5 min. with each rinse.
8. After second rinse with clear water, fill with 10%(100g/l)solution of citric acid.
9. Run ten min. at opperating temp.
10.Drain and flush three times as you did before.
11. Fill system with your favorite antifreeze. Any well known brand will do just fine in your now clean cooling system.Valvoline's Glysantin G 05 is approved by Daimeler-Chrysler for world wide applications. Notice that they state that Valvoline's Glysantin G 05 is approved, and not mandatory that you use it. You can buy from your local auto parts store. It's called ZEREX..