Leaking Coolant - Mysterious Leak
I'm leaking coolant in my truck. Had a pressure test done and we could not find any leaks. I replaced the hose between the reserve tank and the radiator, and it is still leaking.
I'll drive it for about two days, and the coolant is already gone from the reserve tank, but the radiator is still full. It's always full, I have never had to fill it, but the reserve tank is always empty.
So I have three questions:
1. What else could it be?
2. How can I test it from home?
3. I've been filling it with water, and the cold months are approaching. How do I drain the radiator to refill it with coolant?