I have the same problem - unit worked fine for a long time then suddenly started blowing just air or warm air. Is there any way to check to see if it is the fuse or the freon? And is it possible to change either of these once they have been found the problem?
Its July and it is HOT in here!
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Re: Fuse or Freon?
Yes, you can check for freon: you can force the compressor on using 2 jumper wires. look for the wires leading to the compressor motor. Disconnect these wires from the source (not at the compressor). Using jumper wires, connect external house power (120 VAC) directly to compressor and turn that power on. The motor should start. If the copper lines (or finned radiator) get cold, then your freon is ok.
There is usually not a fuse in these units.
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Low freon pressure switch is turning it off. As the coils cool down the pressure drops. As time goes on it will run shorter and shorter cycles. In warm weather freon 22 low pressure should be near 70 lb
410A freon about 150 on the low side
First off, does your A/C engage the electro magnetic clutch on the compressor? Is your climate control all set to A/C function? Do you hear or see the radiator fan blowing at a high rate when switch is engaged? Do you see a constant flow of freon at the sight glass by the receiver dryer (little bubbles are fine)? This are just the basic visual test that a auto tech goes through so this might give you a gen idea of what to do easily on your own.
YOU NEED TO ADD MORE FREON TO THE UNIT. SOUNDS LIKE IT NEEDS TOPPING OFF. YOU CAN BUY R-134A FREON IN A PACKAGE WITH A HOSE AT A PARTS STORE. DON'T KNOW HOW TO CHARGE THE UNIT , NO PROBLEM. OPEN HOOD, START TRUCK,TURN A/C TO MAX WITH BOTH DOORS OPEN RUNNING AT NORMAL SPEED, NO REVING, THEN FIND A BLACK METAL PIPE RUNNING FROM A SILVER DEVICE CALLED AN ACCUMULATOR. THE PIPE WILL HAVE A CONNECTOR, JUST UNSCREW THE CAP AND PLACE FREON HOSE WITH THE CAN CONNECTED TO IT AND SECURE THE END OVER THE PORT VALVE. OPEN FREON VALVE ON THE CAN AND PLACE UPRIGHT AND LET IT SIT. WHILE INSTALLING THE FREON, FEEL THE VENTS BY THE DOORS OR DASH TO SEE IF THEY ARE GETTING COLDER. WHEN THE VENTS ARE COLD YOU CAN TURN THE VALVE OFF ON THE FREON CAN AND DISCONNECT IT FROM THE FITTING AND PLACE THE CAP BACK ON THE VALVE. THAT'S ALL THERE IS TO IT. YOU CAN ASK THE PARTS STORE CLERK WHICH PORT IS FOR CHARGING THE UNIT IF YOUR UNSURE. THEY ALSO SELL R-134A FREON WITH A SEALANT MIXED IN WITH THE CAN JUST IN CASE YOUR UNIT MAY HAVE A LEAK IN THE SYSTEM. REMEMBER, **NO REVING** NO MATTER WHAT ANYONE SAYS. THE SYSTEM WILL NOT CHARGE FASTER. IF YOU WANT FASTER CHARGING THEN KEEP THE CAN WARM. FREON WORKS WITH AMBIENT TEMPERATURE WHICH MEANS WARM DAY OR CAN IS FASTER THAN A COLD DAY AND A COLD CAN. FREON MOVES FASTER WHEN HEATED.
Your system has R-134 Freon in it. the 134 is made up of smaller molecules than the old R-12. The R -134 permeates through the rubber parts of the system. If the system gets too low on Freon, the compressor will stop coming on.(low pressure cut out switch). Have the system serviced with an A.C. machine that can vacuum, measure the amount of Freon in the system, and add the right amount. The machine can also inject die. Later the die will show up under a black light.This will show any leaks you may have.