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Question DetailsAsked on 9/15/2017

I have a leak in my ac unit and had to have it charged 3 times past 6 mos.are leaks hard to locate?

It's getting very expensive to keep paying to have freon added. Tech guy says there is a leak but can't find it. Is it expensive to replace coils? Or can they be repaired my unit is only less than 3 years old and this started last spring

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Sounds to me like you need a new repair tech, because with that fast a leak I would expect it to be detectable if not by dye tracing or ultraviolet or sniffer detection, then by removing the refrigerant, charging the system with nitrogen to maximum test pressure, then using a stethoscope or audible leak detector to track down the leak location. Granted, if the leak is in the tubing in the walls (very rare unless it was nicked by a nail) it can be harder to track down, but generally an hour searching by conventional means and then if not finding it, injecting dye tracer and coming back a weekk or two later (for your size leak) should make it detectable.

Repair - from only maybe $50 more than the detection cost if just a loose fitting or joint on up to commonly $1000-2000 to replace the evaporator coil or compressor (on a 5 ton or less residential unit) if that is the problem. (Maybe $500-1000 or so less if the coil/compressor is still under warranty - check on your warranty period to be sure this gets tracked down and the claim submitted in time in case you haver a 3 year warranty).

If the leak is in the coil itself, a very few HVAC contractors will patch the leak if reasonably reachable on the coil - but generally that is a replacement item. Plus a leakk commonly means corrosion is eating away at the coil, so one leak commonly means another not far down the road, so repairing a bimetallic coil (most are bimetallic - aluminum and copper) is commonly a losing proposition.

You can find lots of previous similar questions about leak repair and coil replacement in the Home > HVAC link under Browse Projects, at lower left.

Answered 3 years ago by LCD

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