Well, the radiator is in, and it is, in fact, new. Although the copper inside does look quite old.... It was advertised as a pallet that HW Labs found and gave to PPCS for a good price. The fin density (30 fpi) is insane on this thing. Should I fill it with vinegar or something?
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OHH... perdie!
Copper doesn't rust. Copper corrosion is green mold like (wet fuzzy) then changes color.
No point in vinegar. (Unless you SEE corrosion)
I'm concerned on the threads they 'look' rusty. is it metal - the barb collars on the tank?
If so, I would just buy a TAP like in a Tap & Die set.. from harbor freight and re tap the threads.. it is not worth introducing vinegar into the radiator.
Vinegar is an acid and you will need to neutralize the acid after use.. Use microwave hot vinegar.. shake the radiator for 5 minutes.. Rinse-look, repeat?
Neutralize by Baking Soda / warm/hot Tap Water. Rinse 3-4 times..
Flush under bath tub hot water, shaking draining, filling shaking draining.
Hair dryer RIGHT away.. get it hot, shake it.. ( it will get hot to touch.. you want to cook the water out .. evaporate it out the tank)
I have been doing Coleman Fuel tanks (Lantern- "Fount"). Vinegar on steel rust.. it flash rusts if you leave it 5 minutes without a rinse.. It has been a learning process. But a Fount, I can do the above then spray WD-40 in side, turning that WD-40 to coat the inside of the Fount.. The Coleman Fuel will deal with that slight bit of WD-40.
You can't WD-40 a rad.
Again, different metals.
Vinegar will change the color of copper to a dull. (but we are talking inside the Fount and your Rad.. (if you use it)
Most of the time the cooling pipes in the center are aluminum.
The tank is probably aluminum.
IF it is ALL copper.. that would be interesting.. might want to try to
'look' inside the tank to SEE those center tube endings.. to make sure they ARE Copper.
100% copper radiator might be heavier then aluminum one. Not doubting you, just saying... I dunno about the center tubes being copper.
If it is a copper aluminum mix, that explains ' old stock '. Bad mix of metals.
You will definitely need a anti corrosion solution.
I use this stuff
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I would just Stick it under the tub and flush it out. If the barb collar soldered onto the tank, the opening with the threads ARE rusted.. I would just Tap it out ...home depot will figure out the thread, bring it with you and you will find someone to figure that out for you , unless you just eyeball and try a screw to fit.. then buy the tap for it.. tap it.. vacuum it.
As far as a drain plug You can drill and tap metal aluminum block/steel... screw in a drain.
you can sweat pipe (copper/brass/aluminum) / solder on a drain plug ... a rad tank.
* Radiator shops
* Machine shop.
* Do it yourself.
EDIT: IF you do go to Home Depot, check out the plumbing section for clear tubes
as you can see my set up above a few posts that is Home Depot clear tubes, was on a bottom shelf opposite brass pipe/faucet repair section.
BRING YOUR BARBS WITH YOU!