Air conditioner last fall was low on freon, almost empty. how do i fix a leak?

After the hole was repaired; did the serviceman charge your system with Freon? This would need to be done as any leaks in a ac system will empty the charge in a short amount of time. window units usually have a very small Freon charge due to the small size.

Would first start by having the freon pressures checked to ensure the proper amount of freon was in the system, if any at all. If system is low or empty, a leak is present. If system is low, ultra-violet dye would need to be injected into the system along with freon and run the system, checking with a black light to find the leak.

When self adding freon after it leaks out you get air trapped in the system. After adding freon a couple of times the air expands not leaving room for the needed freon. To continue adding freon with air tapped will knock the compressor out pretty quickly, there's not enough room for both & the air is keeping the freon from being able to cool properly give the false indication of being low on freon. The freon you are adding has the dye added to assist in finding the leak since freon does not evaporate nor dissipate it its being leaked out. A black light will assist locating the leak. The best thing is to have the unit checked & serviced by a mechanic...he'll charge about $ 150.00 to check for leaks, remove the old freon...his machine will tell him how much air its trapped in the system by how little freon is removed. For the service fee he will replace valves & gaskets, where needed, correcting most leaks. After sucking the system down & recharging the problem should be corrected.

Hi,
You have a freon LEAK!!! They need to find the leak and FIX it for you...

Call them back and make them fix it right or call another company to fix it right for you.

Here is a tip about trouble shooting your air conditioner...

Air Conditioner Trouble -Review the Possibilities
http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

should have drain pan that has to drain or be emptied out.

MAKE SURE THE FILTER IS CLEAN AND COLD COIL IS CLEAN . JUST REMEMBER 70 OUT SIDE AND 70 OR LOWER INSIDE AND YOU HAVE A ICE CONDITION. 75 INSIDE AND 75 OR HIGHER OUTSIDE KEEPS UNIT FROM ICING UP. IF ITS LOW ON FREON IT WILL ALSO ICE UP. MOST OF THE TIME THEY DONT LEAK FREON BECAUSE THEY ARE SEALED SYSTEMS

There are two lines leading into the unit, the high side aND THE LOW SIDE. tO ADD FREON you need to add a valve to the low side line. But if you have a leak that indicates that moisture is in the unit and you need to pull a valum to remove the moisture before ADDING ANY FREON. There are as last known three types of freon, R22, R134a and this last one I dont even know the name.

You are being ripped off. The ambient (outdoor) temperature at night is low and therefore proper condensing does not take place causing the refrigerant to pool in the condenser and starving the evaporator. This causes a lower temperature in the evaporator resulting in "freeze up" which is often mistaken for a loss of refrigerant.
The proper thing to be done is to block off the condenser air causing the high side pressure to rise until the eqivillant of 110*F condensing temperature.
You can also install a low ambient kit which will cycle the compressor off when the temperatures fall

Air filter needs replaced, if the air is low flow but cool out of registers.
Need to find the leak in freon line if air is not cool.
Clean outside unit if either one applies.

Unit is low on Freon. Take it to a repair shop to find the leak & recharge the unit.