Window air conditioners are usually not fixed when broken and most often tossed and replaced.
However they are fixable, often only needing a low-cost part or a refrigerant recharge to get them working again.
One problem when repairing a window A/C unit is they do not come with a service port Schrader valve and need one to be installed.
This is an easy process which only needs a piercing valve kit.
You can also solder on a Schrader valve but it is not necessary and comes down to personal preference.
- Wire brush or emery cloth to clean the area.
- A Bullet Piercing Valve.
Bullet Piercing Valves can be bought at most air conditioning part supply stores or online.
They are low-cost items that make installing a service port on a window A/C unit quick and easy.
Example Bullet Piercing Valve on Amazon
Supco BPV21 Bullet Piercing Valve
How To Install a Service Port on a Window Air Conditioner
- The first step is to find a spot on the copper refrigerant line (Usually low pressure line) that will be easily accessible and clean it with a wire brush or emery cloth.
- Take the piercing valve and hold it on one side of the copper line.
- Attach the other side.
- Tighten down the outer screws evenly.
- After the outer screws are in place, the center can be screwed in which will go into the copper line piercing it.
You can now attach gauges on the unit and test it or refill as you would any other A/C unit.
There are some HVAC technicians who prefer to solder on a valve but in my experience a screw on valve works just as good.
This is of course debatable and is simply a preference that changes from tech-to-tech.
If you are very good at soldering and can do it quickly and reliably soldering a piercing valve on may be best.
If you just need a quick port to add refrigerant or do some test a screw on piercing valve will work fine.
Screw on type valves can become loose over time and 4-5 years and may need to be tightened.
Window A/C units that are fixed are usually already 3-5 years old, if not older.
A screw on valve will more than likely outlast the units working life span.