Tip & How-To about Heating & Cooling

Brazing aluminum pipe for automotive ac.

This tip can save you a whole bunch if you ever had a busted aluminum pipe on your AC line. A typical ac line is not only expensive but most of the the time auto parts would have to order them.
First you will need a propane brazing torch, brazing rods, and a clean wire brush.
Procedure; Fisrt clean the surface really good with the wire brush. The key to a working with aluminum is a very clean surface. Even if it looks clean the oxidation is not noticable. Set it all up so that you are comfortable while you are doing the brazing. Next, fire up the brazing torch. ( Do not use oxygen just plain propane torch will do the job much better.) Heat up the surface that need to be repaired. Now be patient and let the working surface get hot enough. You will know if it is hot enough because if you rub the aluminum brazing rod to the surface, it will smear and turn liquid and cling well to the aluminum pipe that you are working on. You have to rub the aluminum rod untill it builds up taking the flame away momentarily then putting it back on if it gets too hot. If you never done this before, practice on a piece of thin piece of aluminum first. With a little practice, you can repair many aluminum things in the house too. Even an aluminum radiator or the condenser or the evaporator in your cars a/c. Those aluminum brazing rods are actually harder than aluminum so the repair is permanent if done right, but they melt at lower temperature than aluminum. All these item can be bought at ace hardware. Home depot and lowes stopped carrying them in my area. So good luck and have fun on your new found money saving skill. Remember "clean surface" and get it hot enough first" Note* If the hole is too close to the rubber hose, wrap some wet rag to the pipe close to the rubber so that heat will not damage the hose.

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