A/C charged, No cold air

[bassplayaz06]

so i've got no cold air... the system was over charged, so we let it out til it was in the right zone. tried it again and no cold air. blowing the same temp as the outside air. the compressor does turn on. this morning it was cycling about 6 times a minute, then when i got home and tried it, it wasn't cycling as often. about once every 2 minutes.

[djkeev]

Do you have a gauge set up? It is tough to diagnose AC without knowing pressures and temperatures.How did you know you had too much in there? Who put it in? How did you measure the amount removed?Also charging it does really require measuring how much is in there. The weight installed is a very specific quantity, too little or too much and you've got issues.The compressor cycling on and off so frequently is saying that there is problem and the pressure switch is turning off the system, problem goes away, compressor pumps, problem comes back, switch shuts it off and on and on and on.What is it? Could be as simple as a bad pressure switch. Could be over charged, could be under charged, too much oil, etc.If you don't have the tools, be careful working on the AC system, compressed gases are not a fun thing to have go awry. Maybe consider an AC shop, as much as I HATE paying people to do things sometimes it is the best option.If nothing else, wear a pair of googles to protect your eyes should you accidentally release some gas. Frozen eyeballs really suck the big one! Not only purchase.... WEAR THEM even though I know nothing will happen to you. for you are really careful, of course we are all careful, that's why I've been to the eye doctor to remove things from my eyes!Dave

[bassplayaz06]

i'm gettin the teacher at school to look over it after school tuesday. has all the gauges and whatnot

[06pvibe]

Well its unlikely you have too little charge in there or the low pressure switch would not allow the compressor to turn on.From my experience I'm guessing, and this is ONLY a guess, that the expansion valve is shot.Let me know if I'm right when you find out for sure.

[lovemyraffe]

Did you check the air temp selector that's on the under the dash on the passenger side? The wire might have come off.

[ou.grizzly]

Over charging can cause the same issue

[bassplayaz06]

can you be more specific with where that selector is please?

[cq358]

I agree with others' opinion, think your system over charged.Your TX valve is hunting that makes your compressor cycling on and off during start up. It improves the situation a bit If you shut the A/C off for 15 minutes and start the A/C again the compressor cycling will be less frequent.The reason is cause by excess refrigerant trapping at condenser which blocking the refrigerant flow inside the system.condenser is responsible for heat rejection, Since there is too much refrigerant inside the condenser coil, its effective area for heat rejection is reduced, highly concentrated refrigerant vapor occupied in the condenser and hot discharge gas is trapping at the compressor outlet without constant flow. As a result, your discharge temperature and pressure will be quite high.Your compressor should have a built in high pressure switch that disengage your compressor if it sees a sudden surge in high discharge pressure.The sad part is :excessive refrigerant charge will damage TX valve, the TX valve uses to maintain a superheat at the suction line. Superheat is import because compressor itself should only compressing vapor instead of liquid.In a long run, a deteriorating TX valve will damage moving part inside the compressor to make it loose compression by allowing excess liquid refrigerant inside the suction line. According to the label, Remember to have refrigerant that premix with oil. Or else it will fry the compressor and making seal leak refrigerant.Prefer running condition:(35 -40) PSI suction (135-145) PSI discharge..The best suction (low side) temp is 45 F suction and 105 F discharge ( high side).If your system is over charge, the suction pressure will be stable during start up but your discharge pressure will swing quite a bit when compressor is cycling on.If your system is under charge, the suction pressure will be low and your discharge pressure will be very high as well.Once you get your correct refrigerant charge " according to the label at the engine compartment" try checking air temperature at the vent, it should be around 39F to 44F ( low air flow , recirc mode, the car is under the shade, idle at least 20 min)

[bassplayaz06]

i got it worked out. the cooling fan wasn't plugged up, and the system was overcharged. we vacuumed it down, and recharged it to proper levels. works great now!