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Old 06-22-2015
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I am: Damon
Join Date: Mar 2015
Location: Ozark AL
Vehicle: 2001 Ranger
Drive Type: 4x2
Engine: 3.0
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AC compressor clutch cycling on and off very quickly

Hello folks. I'm having a issue with my AC. I took the motor out myself to put in a crank kit and when I put it back in I didn't recharge ac for a month or so but upon recharging it is now cycling on and off quickly. It will cycle on for 5 seconds and off for 5 seconds over and over. I know it has enough refrigerant and I can feel it trying to get cold but will not stay engaged long enough to cool off. Any ideas? I'm thinking it could be a relay but really not sure. Any advice is much appreciated thanks guys
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Old 06-22-2015
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I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
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First check the power at the compressor, put a volt meter or test light on the two wires on compressor, leave compressor hooked up and engine idling, it will have 12volts(13.5v) when compressor should be on.
If the voltage is cycling on and off then there is a problem with the pressure in the system.
If voltage stays on but compressor cycles off the field coil or air gap on compressor is the problem.

If you disconnected the lines and didn't plug them, then there is probably moisture in the system, and that can cause a plug.
You may need to vacuum out the system and replace the drier as it has absorbed too much moisture.

The pressure switches detect high pressure after gasses are compressed, this prevents lines from exploding, and low pressure switch when refrigerant is low, this prevents compressor running dry and burning up.

The gases are compressed which heats them up, this is the high pressure side, they are then allowed to decompress in the cab which causes the lines to cool rapidly, even freeze on the outside, this is the low pressure side.
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