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Thanks for the reply. Yes, I know that draining the radiator leaves a lot of coolant remaining in the system. I suppose starting and running it after draining should cycle some of the remaining back through the radiator for the 2nd draining. Hopefully removing the lower hose should also release...

By "Drain the cooling system" do you mean just draining the radiator? How can I drain the entire cooling system?

So my 96 4.0 v6 has a blown head gasket, and is causing overheating, etc. I don't have the funds right now to get it repaired (around $900), but I was looking for a short term solution so I at least have a vehicle to drive. The mechanic mentioned "Blue Devil" head gasket sealant, and said he...