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Are you filling the radiator up to the vary top? Drive it for a day and check next morning and it is low?
How low was the level? Really low / cant see it or just a few inches down from the opening?
If just a few inches down that is normal for the cooling system. When it heats up the coolant expands and goes to the over flow tank.
Once it cools if radiator is really low it will pull coolant back in from the over flow.
Dave ----
If he fills the radiator to the very top, and then fills the overflow bottle half-way, the radiator should stay completely full. But I know with these old trucks you can't pre-fill the overflow without rigging the top of the tank. But that is what I do, the last one I pulled the plug out of the tank and use a little funnel to fill it.
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