Photograph of attic air conditioning air handler, condensate drips on floor Refrigerant Leak FAQs
Questions & Answers on Causes of & Repairs to Refrigerant System Leaks

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Questions & answers about finding & fixing air conditioning, heat pump or refrigerator / freezer refrigerant gas or liquid leaks:

FAQs about how to repair refrigerant leaks in air conditioning, heat pump, or other refrigeration systems.

This article series discusses how to repair refrigerant leaks in air conditioning and cooling systems, using as an example, repairing a leaky or damaged air conditioning the cooling coil (evaporator coil) in the air conditioning air handler unit. Our photo at page top shows the cooling coil in the attic air handler component of a central air conditioning system.

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Questions & Answers on How To Repair HVAC Air Conditioner Refrigerant Leaks

AC system refrigerant access ports (C) Daniel Friedman

Question: recurrent leaks in low pressure side of AC

(July 3, 2011) james said:

My friend in Tucson,Az just lost her ac unit due to low pressure (leak) for the second time. I'm writing this on July 3rd 2011 and it is going to be 115F here today on a holiday weekend and trying to get service is almost impossible. I might ad that her neighbor is having their system charged every year by another company.

I've found that this seems to be the norm in this part of the country and is not specific to the AC industry. I would like to see these incompetent companies held accountable for their practices. I can only imagine the frustration reliable companies must feel. Thank you for your time and work posting this information.
Best Reguards,jim

[Click to enlarge any image]


about recurrent air conditioning refrigerant leaks:
it is very common for a tech to just add refrigerant and leave; it's a quick, profitable, recurrent service call. Good practice is to find and fix the leak. Of course some home or business owners decide on the less costly service call and just keep adding refrigerant but the cost of repeated service calls says to me we ought to find and fix the leak.

Question: is $1700. to replace a coil and add refrigerant a ripoff n a 6 year old unit?

(July 19, 2011) Wilson said:

My A/C has been diagnosed with a coil leak and quoted $1694. to replace and add the 9 lbs of refrigerant. Sound reasonable or a rip off? The unit is only 6 y/o. Of course the 5 year warranty is gone.


Wilson, replacing the coil involves more work than just a bolt-on repair: the system has to be emptied (and refrigerant saved for disposal), the old coil cut out, new coil soldered or brazed in place, a vacuum pulled on the system, tested for leaks, probably a drier installed, and then the system recharged; I don't think that quote is weird, but certainly for any repair over $1000 it makes sense to get two estimates from two experts and to make sure that they are bidding on doing the same job so you can make an apples to apples comparison.

Question: $1300 to replace a coil and pan on my 2 year old Air Conditioner

(July 19, 2011) AC Coil leak and drain pan leak said:

I got an estimate today from Airtron in San Antonio $1298 to replace the coil/pan/ and a few other things for my Carrier A/C it's 2 years old and has 5yr warranty. Tehy came out and said i had a coil leak and drain pan leak my freon level was 75 and the norm is 125.

The $1298 i guess is for labor since the other parts should be covered by Carrier warranty. I may try to have someone who works there do it on the side for a smaller fee. It just seems so expensive to fix.


Some reasons that an A/C coil leak/replacement and drain pan leak repair is costly (more than $1000) are listed in the Q&A above.

Question: can I re-solder a leaky air conditioner coil that has a tiny leak?

(July 22, 2012) Jim said:

I have a micro leak in the small diameter line from the outside compressor to the inside unit. the hole is at the junction of the tube to the connector, bad weld. I want to try and re solder it but I don't know what would happen to all the freon in the pipes. I doubt that it is flammable but the molecules could break down to something bad. I still have sufficient freon so I don't want it to go to waste.

(July 22, 2012) Richard O'Hara said:

In looking for an a/c leak in a central a/c unit, why not first check for a loose wrench nut fitting? See if any of the nut connections are loose? You didn't even mention that.


Richard your suggestion to try to fix a single leak in an AC coil makes sense - though there should be almost no wrench nut fittings except at the very ends of the refrigerant piping - all the rest are more often brazed.

YOu can often spot a leak at a threaded fitting because the leaking refrigerant gas also brings along a bit of lubricating oil that leaves the fitting dark and sticky. The oily surface on the outside of the fitting around the leak also collects dirt and dust.

Watch out: you may have trouble soldering aluminum coil tubing or brazing and thus melting and destroying other thin-walled tubing materials. You may contaminate the refrigerant system with debris that can then cause a cap tube or TEV vailure. If the leak is on the low pressure side perhaps an epoxy repair would work better.

Question: York heat pump keeps tripping the main breaker. Do I need a new unit?

(Mar 17, 2013) Diane said:

I have an 8 year old York heat pump system. It has been tripping the fuse and not producing air or heat for the past few days. I've been told it could be as simple as replacing a part if one canbe found or I will need to purchase a new unit. Thoughts?



The tripping breaker/fuse suggests an overcurrent that in turn may be due to a failed compressor motor (not at all trivial) or something less costly such as a bad contactor relay. This is a task for a trained service tech not a homeowner. Don't make any expensive repair before the problem has been properly diagnosed.


(Dec 9, 2015) a Houston appliance repair company

sam gordon said: very nice concepts.

Question: sulphur gases and refrigerant piping damage

(Apr 27, 2016) pankaj shah said:
why leaking is create often around area were sulferbase gas passes in the atmospher and what is the permanently solution


Search for CHINESE DRYWALL to read about this sort of problem, causes & cures

Question: my ac gas is leaking

(June 3, 2016) Anonymous said:
my ac gas is leaking ,what is the easiest and best way to determine and fix it.


Please take a look at the article and links above on this page and let me know what questions remain, as that's my best organized answer to your question.

Question: AC tech says a refrigerant leak at a quick connect valve is not repairable

(June 8, 2016) Soph said:
A tech had told me my AC was not repairable due to fact that it was leaking at the quick connections. Why is this?



I can't fairly guess your AC tech by a mere e-text, but it sounds rather suspicious if not downright lazy. The truth may be less irritating. Sometimes a tech will tell you "it can't be done" when of course it could be done, because she is making a judgment call that when you hear the cost you'll say that's not cost-reasonable.

But in the case of an AC system that is otherwise in good working condition and has a forward life, to condemn it because of a leak is rather odd. Only if the leak were, for example, at the tubing brazed to the bottom of the compressor can might I think so negatively.

If the "quick connect" used a perforation method to make a connection to a refrigerant line and that perforation is leaking it would probably be necessary to cut ot that section and braze in a new one. It's a bit of work since it'd be good practice to also cut in a filter dryer on the same line after such repairs. But "not repairable" sounds a bit extreme to me.

Question: nail perforated the refrigerant line

(June 23, 2016) Anonymous said:
Discovered a nail in the insulated line a year after the siding was done. Turned on the cooling no freon in system. Had short dist of pipe replaced should a gas and low filter be used after repair



I hate those nails through piping - at least it was refrigerant leaking out rather than water costing thousands of dollars in moldy wall and insulation repairs.

The use of a filter after repair is an interesting one in this case because the system is new. Still it'd be best-practice to install a filter or filters (in my OPINION) for a couple of reasons:
- the brazing of new line itself can place debris into the piping system
- the system sat empty for a year so there could be moisture in the system or other debris that never was caught

Even a small amount of crud, if it jams into the TEV, can foul up system operation.

Question: refrigerant charge in my car lasts only a few months

(July 4, 2016) Mike said:
My car air con leaks but lasts for two or three months, after which I hook up the bottle and rev until the vents chuck out air at 4c ( from 34c ambiant) Good to go for another couple of months. My question is if the gas leaked out, how come there is negative pressure (I Dont have a vacuum pump) to suck the refrigerant back in, why isn't the system full of air?



There may be air contamination in your car AC system. But typically refrigerant remains in the system but at too-low a concentration to provide cooling. When the AC compressor runs that creates the suction to raw refrigerant back into the system from your charging can.

Often car AC systems leak around the compressor motor drive shaft - unlike building A/C compressor motors that are in a completely-sealed can and driven by electricity, the automotive AC compressor has to be driven by an external drive shaft, pulley, and motor fan belt. The seal around that drive shaft often dries out and leaks during long periods of inactivity. For that reason in my vehicles I make a point of running the AC at least once a month regardless of weather, and when leaving a vehicle parked for a few months I make a point of running the AC for 15 minutes or so of driving before we leave the vehicle.


(July 4, 2016) Og said:
What is the causes of leakage in split unit air conditioning


Refrigerant leaks are caused by
- mechanical damage
- poorly-made connections, brazing errors
- vibration that wears a hole
- external corrosion at a cooling coil, condensing coil, or sometimes along the refrigerant piping itself
- internal corrosion in the system due to contaminants
- defective service valves
- something else I've not thought-of


Question: try using glue to seal a refrigerant leak?

(July 8, 2016) Mario said:
I found a leak in the joint between the body of the compressor and the plate that containd the elctric terminals, the leak is very tiny. I was planning to perform vacuum and add a little cyanoacrilate for high temperature, expecting the leak to be sealed. What do you think?



If I were working on my own unit I'd try that, with some careful surface cleaning first. But I would not warrant the repair for a customer beyond the time that my truck left the end of the driveway.

Question: meaning of heat pump error code P0

(July 30, 2016) Rohan said:
When I turn on my heat pump that showed a code P0 on the led window what is that mean?


Sorry Rohan but error codes are product-specific. You'll want to find the manufacturer/brand and model number of your equipment - found on the equipment covers and on its data tag. With that information, if you don't have one, you will want to download the users' manual for your equipment as that will give you the meaning of error codes it may display.

Try changing the filter.


If your air conditioning or heat pump system has lost its cooling capacity or won't start see REPAIR GUIDE for AIR CONDITIONERS.

As we explain in our articles on lost cooling capacity or air conditioning systems or heat pumps that are not working, a refrigerant leak in your air conditioner or heat pump means that eventually it will just not produce cool air (during air conditioning) nor warm air (during heating if it's also a heat pump).

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