Radiator Storage Prep?

[Professor Fate]

What's the best rust inhibitor to use for winter storage? I'm planning on filling with antifreeze. Also, should I store with antifreeze or empty?

[TXGOAT2]

None. If you have a sound engine and radiator with a non-leaking head gasket, fill it with quality antifreeze, used as directed. If you have a leaky system, it's probably best to drain it. Otherwise, it's far better to leave anti-freeze solution in the system than it is to drain it. Good antifreeze, used as directed, is an excellent rust inhibitor and is good for at least several years of service. If you have a water pump that leaks, best to fix it. Likewise for any leak.

[Professor Fate]

I had read somewhere that antifreeze and copper head gaskets don't do well together. True?

[TXGOAT2]

I've never had a problem with "green" antifreeze in any vehicle, old or new. It's been my experience that cooling systems, especially very old ones, deteriorate when sitting around dry. Most all cooling system issues result from abuse of one kind or another. Running an engine with even a tiny head gasket leak can be very destructive by putting exhaust products into the coolant. Running a water pump vehicle with low coolant or a leaky pump can aerate the coolant, with very destructive results. Many old systems are permeated with mineral residue, and they are best kept full of quality antifreeze, used as directed. That prevents old deposits from loosening and oxidizing, while reducing oxygen exposure to the iron block and head. It also keeps the water pump seal lubricated and free (if present) and prevents gaskets drying out and shrinking or absorbing oxygen. It won't hurt hoses, and may help preserve them.

[Professor Fate]

Thank you!