Enough to shag it, spoken from experience ;)
The average automotive radiator is actually two radiators in one - the larger section for the engine's coolant and the smaller section for the cooling of Transmission Fluid with some having a section for the cooling of Power Steering fluid.
The only valve in a radiator is one at the bottom for draining and flushing of the engine coolant; the rest of the radiator's interior tubing is clear and un-restricted.
landcranch
A large selection of companies produce radiator valves. IVAR and MEPCO are two of the largest producers of radiator valves in the US. There parts can be found through their distributor listings.
Of course
Pressure and Vacuum
Look at the bottom or rear of radiator
Valves will clatter if the engine is overheating.Valves will clatter if the engine is overheating.
Steam radiator valves should always be fully open, or fully closed. Steam enters the radiator from the boiler, and fills the radiator. The air vent shuts, having sensed moisture inside the radiator. The steam then cools, condenses to water, and drains from the radiator. If you leave a valve partially open, then the steam enters easily, because of the pressure. But, the water has a difficult time draining, so the radiator can collect it, and steals it from the furnace, which needs it for resupply.
There are 3 drain plugs on the Toyota Tundra V8 engine and radiator. On the radiator petcock, the plastic thumbscrew, and drain valves are on the bottom, driverâ??s side of the radiator.
16 valves
3 valves
3 valves
With non electric zone valves on each radiator
No, if there are valves so the radiator can be isolated only the radiator needs to be drained along with the location it is being moved to. If no valves are present you would only need to drain to a point below the radiator in question, so it is empty but the rest of the system can stay full. When refilling, unless it is steam the whole system will need to be bled of air.