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I think the hill test will be interesting. If it works going downhill, that would point to air in the system imo. Facing uphill, the air will go to the waterpump, and flow will be reduced. For filling, I like to do it with the engine running. Fill the radiator til it takes no more, then fill...

How long have you had it; the whole 19 years? I ask, because some vehicles can be very particular about how you fill them with coolant, and can trap air if it isn't filled the way it likes. A friend of mine had a car that had to have the front end raised to fill it, or it would overheat. Maybe...

What happens if you're 180° on the hill? Eg, it overheats facing up, how about facing down?