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Old Apr 22, 2024 | 09:43 PM
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Default Need a radiator

I have 2 75 L48 C3s.

I have a great copper/brass one for my convertible that is really clean inside. I know this because I accidentally broke the braze on the lower hose mount. Should be easy to repair.

I have a completely done copper/brass one for my coupe. Sprung a big leak and I already had it "repaired" (read as patched as good as it could be) a couple of years ago.

Going to need to buy a radiator for one of them, but I think I prefer the copper/brass over aluminum, but all I see online are aluminum ones. Originality is not a concern for either.

If I can find a copper/brass one, I'll buy it and put it in my convertible (daily driver) and put the good one in the coupe (extra car).

Can someone recommend a good copper/brass radiator, or am I going to have to go aluminum? Still plan to use the stock thermo-clutch fan as neither have ever overheated even in 105* Houston weather in traffic. No electric fan needed or wanted.

Last edited by Steve Stroman; Apr 22, 2024 at 09:44 PM. Reason: typo
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Old Apr 22, 2024 | 10:47 PM
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I couldn't tell here if you are looking for new or used. I have this out of my 69 that's been recored at least once, maybe twice. Held pressure when I took it out. Loball price for you, mostly shipping.



Last edited by ignatz; Apr 22, 2024 at 11:44 PM.
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Old Apr 23, 2024 | 01:10 AM
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If you go copper/brass, make sure you buy from a trusted vendor.
I just purchased a 2000 Jeep from the original owner who is a friend.
He installed a new copper/brass radiator about a year ago.
It leaks.
Apparently there are copper/brass radiators being sold as new units which are actually older radiators that have been wroughted out, repaired, painted and sold as new.
I would buy a new aluminum from DeWitts.
I bought one for my Corvette and they are actually building a new radiator for my Jeep as we speak.
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Old Apr 23, 2024 | 03:36 AM
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Just buy a nice Aluminium radiator, paint it satin black and no one will know but you!
Aluminium radiators work really well!
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Old Apr 23, 2024 | 12:00 PM
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I second the suggestion of using an Aluminum Radiator! The effect of an aluminum radiator is easily felt when driving your C3 in the hot weather. Aluminum looks absolutely great when polished up so why add a layer of thermal insulation over the surface?

A bottle of REDLINE "Water Wetter" might drop the overall temperature another few degrees. Some call it "snake oil" but to me it is a life saver as it really helps get rid of the engine's heat. My heat maker is a 1968 L88 Clone and she does get hot in the middle of the summer. This is why I have a second Corvette, a C4 coupe with air conditioning for those days when you need some cool air.
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Old Apr 23, 2024 | 01:10 PM
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Originally Posted by ctmccloskey
I second the suggestion of using an Aluminum Radiator! The effect of an aluminum radiator is easily felt when driving your C3 in the hot weather. Aluminum looks absolutely great when polished up so why add a layer of thermal insulation over the surface?
Because a thin layer of black paint is not an effective insulator, but it is an effective thermal transfer media. I’m sure everyone is aware that black is very good at absorbing thermal energy, and it also means it is very good at releasing thermal energy.
I used to design light fixtures that were made from thin aluminum to disperse the heat of the electronics. We saw a significant reduction in heat when we powder coated them flat black. Since we made thousands of fixtures a day, every penny counted, so we wouldn’t have painted them if it wasn’t worth it.
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Old Apr 23, 2024 | 03:54 PM
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Originally Posted by ignatz
I couldn't tell here if you are looking for new or used. I have this out of my 69 that's been recored at least once, maybe twice. Held pressure when I took it out. Loball price for you, mostly shipping.


Thanks, but I need one for an automatic.
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Old Apr 24, 2024 | 04:08 PM
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I purchased an aluminum radiator a couple of years ago. It was a 2 row, but the tank was too thin (by about an inch) to fit in the saddles where they are supposed to sit. I'm looking for a 4 row, hoping it will fit the saddles.
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Old Apr 24, 2024 | 07:14 PM
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Some brands fit better than others. Don't be buying a Ebay cheapie. Dewitt's fit perfectly, but expensive. Cold case also fit extremely well. I run the Champion brand. Imported, but fit not quite perfectly, but without hassle.
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Old Apr 24, 2024 | 07:26 PM
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Originally Posted by wwiiavfan
Because a thin layer of black paint is not an effective insulator, but it is an effective thermal transfer media. I’m sure everyone is aware that black is very good at absorbing thermal energy, and it also means it is very good at releasing thermal energy.
I used to design light fixtures that were made from thin aluminum to disperse the heat of the electronics. We saw a significant reduction in heat when we powder coated them flat black. Since we made thousands of fixtures a day, every penny counted, so we wouldn’t have painted them if it wasn’t worth it.
this is correct. And thus the old ballast covers to reduce heat were painted black.
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Old Apr 25, 2024 | 09:45 AM
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Buy a DeWitts Aluminum and you will be very happy as well as the car.
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Old Apr 26, 2024 | 12:21 PM
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If you go to DeWitts website, you can order your new aluminum radiator with their special black coating.
Its not paint nor powder coating.
Their website explains the advantages of having in on the radiator.
I only wish they offered it back when I purchased mine.
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Old Apr 27, 2024 | 06:19 AM
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Originally Posted by OldCarBum
If you go to DeWitts website, you can order your new aluminum radiator with their special black coating.
Its not paint nor powder coating.
Their website explains the advantages of having in on the radiator.
I only wish they offered it back when I purchased mine.

That's exactly what I did 12 years ago. I ordered it with the black ice two-part epoxy which actually improves cooling, as mentioned above. It has been a great radiator.
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