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Re: no air on 93 taurus using 134a, compressor does not...
You are probably low on freon again. If the system is low, the pressure switch won't turn on the compressor. Add a can of R134A using a hose that has a gauge on it. It should read in the "Good" area if you have enough freon. Adding a can will probably be enough to start it working. If so, look for a leak somewhere, usually around connections where O rings leak.
You will see some oil spotting where the leak is.
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First thing is to check and see if there is a belt in tact on your compressor and then see whether or not the compressor clutch engages (clutch is on front of compressor in front of belt.) If so and no cold air, u may need to charge it with 134a refrigerant or have a leak that you'll probably want a shop to repair. Good luck and hope you stay cool.
Ask if the system was checked for leaks. Not just die checked but by actually hooking up gauges and watching. The system could be pulling in air ( and moisture) after being shut down. This is unlikely. But when you eliminate the obvious you have to start looking at the unlikely.
Well yes, there is a separate switch. If the A/C system is low on freon, the low pressure switch will keep the compressor from engaging to save it from damage due to no lubrication. The freon helps with lubricating the compressor. Get you a can of 134a from the parts store and add a little to see if the compressor will come on. It should come on before one can is used. Now for the freon to be gone means you have a leak. So if the can gets you cooling, try to find the leak so you can stay cool.
See if it's the compressor by watching the compressor either spinning ( compressor is working ) or not ( compressor not working ). Compressor will not engage if refrigerant is low. Add R-134a ( 12 oz. can )
First, the old R-12 must be completely evacuated fromt the system. R-12 and R-134A do not mix and won't function together. Once you are sure there's no R-12 left in the system, you need to install an R-134A fill valve on the low side AC line. This is where your refill hose will connect to add R-134A. Once the valve is in place you're ready to fill the system. The compressor requires a minimum of 20psi to engage and should not be filled to more than 45psi.
RECHARGING AC SYSTEM
1.Turn the truck on and turn AC on HIGH 2.Locate the low side AC line (will have a valve and cap similar to the cap on a tire) 3.Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet) 4.Insert the other end of the refill hose to the low side valve 5.Puncture the R-134A can with the screw on the refill hose 6.You should feel the system suction the refrigerant out of the can 7.Check for frost on the AC lines and the air blowing inside the truck 8.If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective Hopefully this answers your question and you're able to get your AC working again. Best of luck.
If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close . 134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold
You would be low on 134a. To put refegerant in an a/c system you need to pull a vaccume on the system. Any air in there it will not work. It would be worth the money to have some one do it. But I'd look at the compressor case halfs and see if they are leaking before having it charged. You could fix that yourself and pay some one to charge it, if they are leaking.
IF THE SYSTEM HAS A LEAK, THEN THE COMPRESSOR CLUTCH WILL NOT ENGAGE. TRY PUTTING SOME 134A FREON IN THE LOW SIDE(LARGER OF THE TWO LINES). AND SEE IF THE CLUTCH PULLS IN. IF IT DOES, THEN THERE IS A LEAK SOMEWHERE. IF YOU GET THE FREON WITH THE LEAK DETECTOR DYE IN IT, THEN YOU SHOULD BE ABLE TO LOCATE IT RATHER EASY. SOME CANS COME WITH A STOP-LEAK, BUT THESE TEND TO CLOG UP THE ORIFICE TUBES. HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA. GOOD LUCK