Adding freon - 2004 GMC Yukon

Did you try to add freon because is was no longer blowing cold air? Who added the freon local repair shop or A/C specialist?

there's no way to legally take Freon out without a machine but if you push down on the valve with something some Freon will come out

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.

You will see bubbles when freon is low....so, keep adding freon untill you see "no more bubbles" (clear)..as soon as it is clear STOP adding freon...You should be good to GO...

You shouldn't ever have to add freon to an a/c system. It is a closed system - like your refrigerator. When was the last time you added freon to your refrigerator or home a/c when there wasn't a problem?

If you are needing to add freon, then you have a leak somewhere that needs to be repaired. Your local automotive technician can diagnose the problem for you. Freon should only be added by trained professionals. If you don't know what you are doing, you can charge the system incorrectly causing significant damage to the system.

If you still want to do it yourself, reference this article.
You will need a set of A/C Gauges, and freon.
Do NOT put any type of stop leak into the system - this can cause irreversible damage to the compressor.

When adding the freon, did you add it using a pressure gauge? If there is too little OR too much freon in the compressor it won't turn on. Could also be the compressor relay or switch.

Needs to be checked for a freon leak, best way to do this is to recharge and add dye, with a uv light you will be able to fine the leak, most auto parts sell the dye, and the flash light you will need to fine the leak, good luck.

Either the system is still low of freon,or the sensor (one of them)is bad.The sensors are on the high side of the system,liquid line.If you will get on chat,I can help you with this,it will take a while,I will need to know how much freon was added.And what the system is doing,is the ac clutch engaging,etc?Ask for ronicon,when you click on chat with,type my name in,roniecon,with your text,that you are writing .

It sounds like by adding refrigerant to the system it may be over pressurizing. When this happens it will cycle on and off.

You will need to hook up a set of manifold gauges and monitor the high and low pressures to see what is happening.

Instantly if enough was added,Just make sure the compressor is coming on and staying on,then post back details