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Clutch coil bad . The A/C compressor clutch coil is a electromagnet an you need to check it with an ohm meter . Check out video on youtube testing A/C clutch coil .
You could have several problems. If your pressure readings (freon) are low it will not kick on the clutch for the compressor. Do you happen to know what your pressure readings are when you do jump it or what they are (low or high pressure side) when it isn't engauged? Also you could be dealing with a relay or a sensor that detects your pressure readings. Really knowing your pressure readings would be a start before I can begin to help.
power to the ac compressor is the problem
could be the thermostat relay or what you have the ac set at
the ac will cycle if the cabin temp is at the setting
if you have climate control it will cycle as well
I passed this question the first time I read it, so I will take a stab at it now. The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch. I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ? Speeding up the engine would increase voltage from the alternator. This is assuming the serpentine belt is tight and everything else is working correctly. I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.
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.
If the compressor is working, a mechanic would check the low and high gauge pressure. The freon has to flow thru the system to work, and the cooling fan draws air thru the condenser to get rid of the heat from inside the car. If the ac clutch is working but the gauges show equal pressure, the compressor may be faulty.
If it is cycling then its low on freon .. Try to put in one can and this will take care of your problem.. The cycling is due to being low .. The clutch is operated by a pressure switch .. when the clutch kicks in it pressures up but not enough freon will kick it back off and starts over again ... Thanks Jerry
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