AC dask board switch LED blink 2 or 3 second after turn on, AC compressor just replaced and recharge 134a fluid, thats cool down only y keep switch on and off consecutive, don`t cool dowm if just turn on only blink green (toyota tercel 1995) thank you for all that help
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You did put 134a back in? But possibly not enough? There is a pressure safety switch somewhere in the system that detects pressure and opens the circuit if not enough freon. At least that is where I would start. Does the Compressor turn freely otherwise by hand? Did you get enough compressor oil into the system (new Compressors need special charge with compressor oil).
NEW AC COMPRESSOR POUR OUT SHIPPING OIL COME WITH IT ADD THEM SAME AMOUNT.IF YOU NOT SURE AND OIL BEEN POURED OUT.ADD 2 OUNCE R 134A REFRIGERANT OIL TO NEW COMPRESSOR. YOUR AC SYSTEM HOLD 1.75 LBS R 134A REFRIGERANT.
There are several possibilities. First, check the a/c fuse. Refer to your car's manual for its location. Moving on, it could be that the compressor will not come on because the refrigerant fluid pressure is too low, as the compressor requires a minimum fluid pressure. Check the refrigerant pressure and add if necessary. You can get a R-134 refrigerant kit at most discount stores and auto part stores. Or, there could be an electrical problem with the compressor's connectors, wiring, or the a/c switch. Test the leads with a voltmeter, and/or wire the leads directly to the battery to see if the compressor comes on. If it does, then the problem is in the circuit or the switch. Or, the compressor could be bad, and needs to be replaced.
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.
you should be adding the 134a to the system the low pressure switch is doing its job by not allowing the compressor to kick on, it wont kick on until there is enough 134a in the system to be above the preset pressure for the low pressure switch.
I had the same problem. The thing is you need to have the air on while you're recharging it and the compressor won't turn on. I was able to recharge the air by disconnecting the positive battery cable and reconnecting to reset the computer and immediately have someone inside the vehicle turn the air on before the computer can recognize that the refrigerant is too low and disable the compressor again. This will allow for the compressor to turn on and for you to recharge the air. Make sure that you have the replacement refrigerant connected before you turn the ac on so the refrigerant goes in and keeps the compressor on before the computer catches it again.
It will normally come on by itself once you add the 134a if doesn't come on by itself I'm thinking you have a bad pressure swith in which is locacted in the A/C line in itself up on the passenger side by the firewall you can uplugged it there and jumper the 2 contacts together if the compressor kicks on it is either a bad pressure switch or there still isn't enough 134a in the system.