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what do you propose to do with the nitrogen pressure wise? Need to know so I can tell you which path of repair to take.
 

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Not sure you're going to hear a small leak. One option is to charge to 200-300 psi and go around with soap bubbles to find the leak. That will only work on fittings, but not the coil. The other is to add a 1/2 pound of charge, add the N1 to 200-300 psi and then use an electronic leak detector. If this is a small leak you may need to be pretty close with a detector. It seems leak detection is part science, art and luck.

300psig??:eek: Thats a lot higher than some evap press burst test pressures.
 
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