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Jb weld on radiator?

jteske88

jteske88

New member
So I'm at work today walk by my car and moisture under it so I open my hood and look for coolant cause after touching the spot I knew what it was so anyways I find next to the over flow bottle a very small pin hole, it doesnt always leak just twice in the past month never seen it before but I'm wondering for a temporary fix until my funds allow me to purchase a new radiator can I jb weld it? Has any one ever done this?
 


I got a radiator from rock auto for like $150 shipped. JB should be fine until you can get one though, just check it evey now and then to make sure its not still leaking.
 
A long time ago I used JB weld on a small crack in the radiator. It didn't hold for very long, but if it's super tiny the JB could get you by in the meantime. As someone else said, check it often. JB vs Coolant usually goes to Coolant.
 


Well I did it it's gonna cure over night. Some of you kinda knocked it but it is just a hairline crack just about a **** hair long so I just coated the area and then some cleaned it real well so hopefully it will get me by
 


Doh didn't post in time.... If you sand the crack with 120 grit sand paper, clean it and then use Jb weld or what I used ... Quicksteel epoxy you can make a repair that could last years! I had a patch that did last me 3 years I found a spare radiator and had t laying around until I just dropped it in but the patch held fine!
 
Actually phoniex I did what you sand sanded and prepped my area so I wouldn't have to worry so much now my next question is how will I go about bleeding my coolant system since I disconnected it from radiator so there was no pressure on my weld
 
Courtesy of webracin:

If you have worked on ANYTHING that requires messing with ANY part of the cooling system, you must bleed the air out of the cooling system using the bleed screw on top of the thermostat housing. Failure to do so will result in an air pocket forming in the top of the engine which can cause the thermostat not to open resulting in the car overheating. You can also have steam pressure in the top of the engine build up enough that coolant will not flow through the heater core inside the car causing you not to have heat in the cabin.

The car should be cool when adding fluid. Take off the radiator cap and top off the radiator, then start the car. Open the bleeder screw about 1 full turn. As soon as you see coolant dribble out, close the screw and top off the radiator again. Open the bleeder screw again about 1 full turn, close it when you get a steady stream of coolant coming out of the bleeder screw. Top off the radiator one more time and replace the cap.
 
I don't know iftge gp's have it but my mc has an extra bleed screw on the firewall for th heater core too. Both are good to bleed if you have them. But the fire wall scree can and does break so be careful
 


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