Car Experts Needed, Recharging AC
07-23-2011, 03:48 PM
#1
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Car Experts Needed, Recharging AC 
basically...
the can is connected to the Lower port, but the air from the lower port pushes back to the can....everytime i press down on the can....the cold air doesnt seem to be strong enough to go down the tube....
Solution?
07-24-2011, 02:23 PM
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Do as t/a98 said and check your pressures first to see if you really need a charge, if you do an old trick to help push the refrigerant into the system is to dip the can in a small bowl of hot water while its connected to the port. By hot I mean just hot from the tap, not boiling or anything.
07-24-2011, 10:58 PM
#4
it helps to have one of these
instead of just the hose and can tap that your pic shows.
and when the compressor is not running (the AC is off) the refrigerant pressure within the whole system is over 70psi (depending on outside air temp) which is generally more than what's in the can, or very little refrigerant will flow out of the can into the system. You need the AC on, compressor running, so the low side will be less than 30 psi if you're low on refrigerant. If you're really low, the compressor might not kick on in which case you need to jump the low side pressure switch. Once you start getting refrigerant to flow into the system, the can will get really cold that's how you know, and to get every bit of refrigerant out of the can you can wrap it in a hot wet towel to warm it up.
instead of just the hose and can tap that your pic shows.and when the compressor is not running (the AC is off) the refrigerant pressure within the whole system is over 70psi (depending on outside air temp) which is generally more than what's in the can, or very little refrigerant will flow out of the can into the system. You need the AC on, compressor running, so the low side will be less than 30 psi if you're low on refrigerant. If you're really low, the compressor might not kick on in which case you need to jump the low side pressure switch. Once you start getting refrigerant to flow into the system, the can will get really cold that's how you know, and to get every bit of refrigerant out of the can you can wrap it in a hot wet towel to warm it up.
Last edited by 1 FMF; 07-24-2011 at 11:03 PM.
07-25-2011, 03:02 AM
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You need to verify the system is actually low. Then the motor and compressor needs to be running, max cool and max fan settings. If its low it will suck the can in. Remember, you MUST back the needle screw back out after piercing the can to let the freon out of the can.
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07-25-2011, 11:51 AM
#8
If you have too much refrigerant in the system (overcharged) the low side pressure will be higher which will result in warm air. You need to have the correct amount of refrigerant in the system, and you can tell that by using a gauge like the one I posted. Did you notice the blue region between 25-45 psi that says "FILLED" ? If you're under 25 psi your probably low which is why it's blowing warm air, and if you're over 40psi you're overcharged and it will not blow cold air! This is assuming there is nothing else wrong with the AC system either, to know what you're doing you need a gauge set to also measure the high pressure side:
07-25-2011, 05:28 PM
#10
it helps to have one of these
instead of just the hose and can tap that your pic shows.
and when the compressor is not running (the AC is off) the refrigerant pressure within the whole system is over 70psi (depending on outside air temp) which is generally more than what's in the can, or very little refrigerant will flow out of the can into the system. You need the AC on, compressor running, so the low side will be less than 30 psi if you're low on refrigerant. If you're really low, the compressor might not kick on in which case you need to jump the low side pressure switch. Once you start getting refrigerant to flow into the system, the can will get really cold that's how you know, and to get every bit of refrigerant out of the can you can wrap it in a hot wet towel to warm it up.
instead of just the hose and can tap that your pic shows.and when the compressor is not running (the AC is off) the refrigerant pressure within the whole system is over 70psi (depending on outside air temp) which is generally more than what's in the can, or very little refrigerant will flow out of the can into the system. You need the AC on, compressor running, so the low side will be less than 30 psi if you're low on refrigerant. If you're really low, the compressor might not kick on in which case you need to jump the low side pressure switch. Once you start getting refrigerant to flow into the system, the can will get really cold that's how you know, and to get every bit of refrigerant out of the can you can wrap it in a hot wet towel to warm it up.
This where you NEED to Start....period. That Cheapo hose is WORTHLESS.
