[Stocker]

Sounds like the radiator is doing its job since you're not overheating.

Unless a coolant recovery (overflow) tank has been added, it's normal for coolant to be a couple inches or so below full in the radiator. Any more than that will usually puke out when the engine is shut off.

I would add a recovery tank. You can fill the radiator to the top and not lose any coolant. Instead of puking on the ground, it flows into the tank. As the engine cools, it will be drawn back into the radiator.

All you need is a tank and a radiator cap for a sealed system. Run a few feet of plastic hose from the radiator nipple (by the cap) to the tank and you're set.