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I have an aftermarket aluminum radiator from a previous owner on my Elise, I'm almost certain it is from wizard cooling based off measurements. Im still trying to figure out exactly where. but it has a small pin hole either on one of the cross pieces of the core, or where the cross section mounts up to the end caps. I'm wondering if I were to find it is there a decent DIY I could do, or if it has to be welded. Also if it has to be taken to a proffesional does the cost of the repair usually come out to about the same as just buying a new one?
 

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You can epoxy it. Many radiator shops just use epoxy nowadays as well.

I have several thousand miles on an epoxied one in one of my cars with no issues.
 

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What kind of epoxy do you use?

Someguy, one trick to test (find leak in) radiator is to cut bicycle inner tube; clamp each end to radiator and fill with air.

Uh, don't forget the cap.
 

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I think there is a special epoxy for just that purpose, but I have used regular 5 minute epoxy twice with no issues.
 
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