Q&A

You will lose some coolant over time. It is usually nothing to worry about unless it is going low on a regular basis. Do you have to keep topping it off?

The way an automotive shop would locate the leak is by removing the radiator cap and attaching an adapter that screws on in place of the radiator cap. Something that looks like a bicycle pump with a pressure gauge attached to it is used to "pump up" pressure to simulate pressure generated when the cooling system is at operating temperature, the leak is then found sometimes it is obviously leaking from a coolant hose or cracked housing, failed gasket or water pump, sometimes the engines cooling system needs to be inspected from below or inspected using a mirror and flash light. If the coolant loss is still evasive dye can be added to the cooling system that may indicate the source of the leak. A mysterious coolant loss may even be a sign of a head gasket that is not sealing well.

You will not and should not lose coolant. It is a system that overflows into the Coolant canister when it is hot and then sucks it back in when it cools. You need to have the cooling system pressure checked. You also need to have the cooling system checked for Hydrocarbons. You most likely have a blown headgasket/headgaskets. If so you are about to experienced why the northstar engine is a piece of s#$@(crap). Their is a product that I have succesfully used to seal a small headgasket leak. It is called BLUE DEVIL. If you follow it exactly as it directs you it does work. Also google 4.6 headgaskets and there is another company that specifically addresses this proplem.
The problem with a 4.6 northstar is that depending how many miles you have on it the head bolts pull out of the block.

Moe

cracked head or head gaskets