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Old 04-12-2021, 05:10 AM   #21
shew01
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Default Re: Repairing radiator puncture

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Originally Posted by alexiskai View Post
Follow up: local radiator shop put it under water and detected two additional leaks. They soldered those up, tack welded repairs where the frame had rusted, and gave it a fresh coat of paint. $160

You are fortunate to find a radiator shop that actually does repairs. Radiator shops around here just want to replace with a new radiator.


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Old 04-13-2021, 01:42 PM   #22
Afordman31
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Default Re: Repairing radiator puncture

I just finished soldering one of mine. My Dad taught me to use Muriatic Acid the kind that you can clean pools with. He gave me a couple of zinc canning jar lids that you cut up small little pieces and put in the small amount of acid that you will use to clean the spot where the leak is. The zinc will bubble in the acid so you keep adding small pieces until the bubbles subside. I used a knife, sand paper, small wire brushes to get it as clean as I could then used the mixture of acid with a acid brush to clean the area. I use flux and solder that you would use to solder copper plumbing pipes. As stated do not heat excessively as to not unsolder other areas. I use a Bernzomatic propane torch. I have unsoldered the tank tops off a couple of radiators in the past so that I could clean out the tubes, then soldered the tops back on. It is all learning experiance! Also stay down wind of the acid!
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Old 04-14-2021, 08:11 PM   #23
midgetracer
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Default Re: Repairing radiator puncture

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I just finished soldering one of mine. My Dad taught me to use Muriatic Acid the kind that you can clean pools with. He gave me a couple of zinc canning jar lids that you cut up small little pieces and put in the small amount of acid that you will use to clean the spot where the leak is. The zinc will bubble in the acid so you keep adding small pieces until the bubbles subside. I used a knife, sand paper, small wire brushes to get it as clean as I could then used the mixture of acid with a acid brush to clean the area. I use flux and solder that you would use to solder copper plumbing pipes. As stated do not heat excessively as to not unsolder other areas. I use a Bernzomatic propane torch. I have unsoldered the tank tops off a couple of radiators in the past so that I could clean out the tubes, then soldered the tops back on. It is all learning experiance! Also stay down wind of the acid!
I do not see how this method would clean the copper tubes. What you end up with after adding zinc until the bubbles stop is Zinc Chloride. Muriatic acid (Hydrochloric acid) plus Zinc yields Zinc Chloride and hydrogen gas. What is the purpose of the Zinc, when the acid will do the cleaning... I don't believe Zinc Chloride will clean the copper, or is my Chemistry training missing something?
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Old 04-15-2021, 09:29 AM   #24
Afordman31
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Default Re: Repairing radiator puncture

Old school technology, but worked for me! No leaks when finished!
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Old 04-15-2021, 09:44 AM   #25
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Default Re: Repairing radiator puncture

Zinc chloride is a form of liquid flux, right? So it's not cleaning the area so much as assisting the soldering.
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Old 04-21-2021, 02:12 PM   #26
Tinbasher
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Default Re: Repairing radiator puncture

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A trick. When pressure testing a rad. Us a motorcycle tube and cut it in the centre. Then take the two ends and attach it to the upper and lower tubes. Put a little air pressure about 3 pounds and do a water check. Simple and works well. Used it many times fixing rads for guys.
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Old 04-21-2021, 02:45 PM   #27
19Fordy
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Default Re: Repairing radiator puncture

You were treated fairly by the radiator shop. Well worth it.
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