What are the methods used to replace coolant on a vehicle without a drain? I am due to change the coolant on a vehicle with a very tight engine bay and no drain plug in the radiator. The hose clamps are almost impossible to reach because it's a turbo engine and the front mounted intercooler pipes are in the way. On vehicles with a drain valve in the radiator, it's a very controlled process, coolant is emptied into a bucket or pan with minimal effort and mess, what methods can be used in systems without a drain? There is no radiator cap either, just a Schrader valve for bleeding air and a coolant reservoir away from the radiator.
In general, the easiest way to drain coolant from systems like these is to disconnect the lowest fitting between the coolant hose and the engine block and let the coolant just drain out. Usually, it's near the bottom of the block itself, so it shouldn't be hard to reach from underneath the vehicle.