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Relay will not engage if pressure switch thinks freon is low. This switch does sometimes fail. If you are sure freon is ok, use jumper wire to bypass low pressure switch and see what happens.
A mechanic would start at the compressor and work back. Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ? You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.
ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.
The accumulator or dryer looks like a long cylinder, it has a pressure switch on it and two wires attached to it. pull the wired molex off, with the ac set on max cooling, jump out the two wires with a wire or paperclip, if the clutch on the ac compressor engages, check the cab to see if its cooling, if it does cool the switch needs to be replaced, if it does not cool, you may need freon, and there could be a sign of a leak in your system, that can be best checked with ac manifold guages. the low pressure switch is there for safety if the canistor or accumulator is low or has no freon the switch opens up and keeps the clutch from running so that the compressor will not burn up. good luck!
FIRST I CHECK ALL FUSES AND RELAY.TO BLOWER MOTOR IF IT STOP BLOWING.AND CHECK FUSE TO HVAC SWITCH CONTROL.AND CHECK FUSE / RELAY TO AC COMPRESSOR.IF FUSE / RELAY GOOD POWER GETTING TO AC COMPRESOR CLUTCH COIL AND LOW PRESSURE SIDE 28 PSI AND HIGH SIDE 200 PSI. CLUTCH COIL IS OPEN.IF REFRIGERANT LEVEL LOW YOU MAY NEED MORE REFRIGERANT.YOU NEED AT LEAST 28 PSI ON LOW SIDE AND 200 - 220 PSI ON HIGH SIDE.IF ALL IS GOOD STILL NO AC PROBLEM COULD BE A FAULTY AC CLUTCH CYCLING PRESSURE SWITCH.
2006 Kia Sorento EX. I had this same problem. It started after I had the ac compressor replaced. At first it was intermittent, it would blow cold and then blow hot, blow cold then blow hot again until it just started blowing hot. Turned out it was the AC relay switch in the fuse box under the hood, I swap it out with the horn relay switch (they were the same type relay switch) the ac has been working fine ever since and the horn also works even with the bad relay switch. Go figure?
some of these newer ac systems use safety pressure switches on the low and the high pressure lines , ck and see if yours has 2 and ck accordingly,,,goodluck...
put it on a special machine to weigh the amount of gas in the system by extracting it ,then refill to the correct weight of gas ,if still not working then work backwards looking for the feed and try to isolate the problem ,like the AC on switch and then the blower motor switch
try removing the plug off the low pressure switch on the accumalator plug a paper clip into the plug and turn ac on if it comes on then your low pressure switch is bad or your low on refigerant.
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