How to find refrigerant leak if no more refrigerant left to leak?


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Old 01-13-18, 11:40 AM
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How to find refrigerant leak if no more refrigerant left to leak?

I see on youtube people use soapy liquid to find leaks in the coil.

What if all refrigerant has leaked out, there would be no more air leaking out, so how can you find the leak with the soapy liquid?
 
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Old 01-13-18, 11:54 AM
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I'm responding directly to your question but the administrators of DIY have requested no discussions in the forums on the sealed refrigeration system in home A/C units.

A tech would charge the system with nitrogen to find a leak using that method or a small amount of refrigerant and a leak detector meter.
 
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Old 01-13-18, 12:10 PM
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Oh sorry. I just read the sticky and just found out it's illegal to attempt repair on refrigerant.
 
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Old 01-13-18, 12:48 PM
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It’s not illegal to repair a refrigeration system. But the government says you need to be licensed to do so, as well as legally do any tasks that involve refrigerant.
Leak detection in a coil is very difficult with soap bubbles. May need an electronic leak detector to find it.
 
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Old 01-21-18, 04:54 AM
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As a homeowner you are limited on finding a leak. You can look for oil residue at fittings, soldered or mechanical, sometimes there is oil at a leaking joint, otherwise call a licensed professional.
 
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Old 01-21-18, 05:24 PM
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Leaks are typically too small to be detected using soap bubbles.
Leaks are often hard to find and not easily repaired and most of the time replacing a fridge makes more economic sense.
 
 

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