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Old 08-16-2010, 11:54 AM
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Rad flush or CLR in brass/copper rad?

I just bought a used 4-core rad for my truck. It has been rebuilt once already and has been sitting for a while empty. I want to clean it out well. It's out of the vehicle right now so I was thinking of putting the cap on, laying it on it's back with the hose connections pointing upward, filling with hot water and then either Prestone rad flush or CLR. Which would be better? I guess Prestone I wouldn't have to worry about odd reactions like I would with CLR?

Also, the rad has an extra hose connection by the tranny cooler ports. I need to plug that. Can I just use a short bit of hose and then put some kind of pipe plug in the end? That is what the seller told me to do. Thanks.

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Old 08-16-2010, 02:52 PM
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A rebuilt radiator? Something tells me it's gonna leak. You would've been better buying a new one. I don't like the idea of rebuilding a radiator.
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Old 08-16-2010, 04:37 PM
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If by rebuilt you mean re-cored by a reputable radiator shop , I would clean it with Prestone flush . If it a repaired radiator , I would be afraid to use it . A radiator that has been re-cored by a shop that specializes in radiators is as good as a new one.
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Old 08-16-2010, 08:21 PM
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It sounds like a GM radiator with an extra connection for the heater return line. You can get a rubber cap/plug for it at most parts stores in the Help! or Dorman parts section. You just slip it over the port and put a hose clamp on it.

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