If only the pulley is rotating, the compressor clutch is having an issue, which could be stemming from several sources – a blown fuse, bad clutch oil, low-pressure lockout, or an open wire in the oil. For a better experience, please enable JavaScript in your browser before proceeding. Granted, this was from a senior year engineering lab and may only pertain to the equipment we were using. If you have a can with oil in it and do not invert it, the oil will stay in the can and only the refrigerant will evaporate and flow into the system. Also, find out whether the clutch and the pulley are spinning. Removed the belt and clutch center turns no problem. It was my understanding you shouldn't introduce liquid into the compressor as it could wash out the internal seals. 5 (Nil) 5 (Z) Grommet 100 V 100 V or less — 1 (M) IC circuit — IC circuit IC circuit — IC circuit — IC circuit. Probably has low R134A. For a better experience, please enable JavaScript in your browser before proceeding. Like a second or two inverted and then back upright. If it is right side up, you are only flowing in gas, not liquid, and it may not transfer enough to start kicking the compressor on. I can confirm that a can of R134a should provide enough pressure in an empty system to kick on the pressure-cutout switch. In most models, you will be able to remove the switch separately from the A/C itself, so you don’t have to take out the whole A/C. It cannot be safely jumpered around. I need to put in some freon and the pressure is so low that the pressure switch won't let the compressor kick in. In other cars , I just disconnected the pressure switch connector and shorted connections until I heard the a/c compressor clutch relay kick in and that fooled the system into operation and you then immediately start charging up the system...once you have some "freon' in the line the connector can go back on and you should be able to finish charging. Even better if the system has had a vacuum slapped on it before you try refilling. I'm not certified and I guess I'm not a "professional" since I've never been paid, but I have done a lot of A/C work.

Before I start replacing parts I want to rule out possible electrical issues first. If your AC compressor kicks on, then you know the system is working. Probably just needs a recharge. To check/jump the low pressure switch, don't run a wire from the battery.

1965 Scout 80 7.3PSD/ZF/203/205 D60F/14BFF. Unplug the plug on the low pressure switch. Locate the A/C, and find the pressure switch attached to it.

History does not long entrust the care of freedom to the weak or the timid. Putting the can in a warm 120 deg water pan will also help. As a guy who did (commercial) AC and Refrigeration for a living, I guess its somewhere around 35 years or so now. If you jumper connectors, you WILL burn stuff up! Please help. Is the compressor clutch engaging at all ? This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

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My 03 Jetta has a three wire plug pressure switch on the large line close to the firewall. You will damage your circuitry, of if lucky, just blow a fuse. Advice about not dumping liquid refrigerant into the low side of a compressor is correct. The best way to find the pressure switch in your air conditioner is by consulting the manual for your car or in-home air conditioning system.

The three wire HP sensor is not a switch. Which wires do you jump around to get current to the clutch so I can add enough freon to get the low pressure switch to allow current to the clutch? Even a paper clip will work. You must log in or register to reply here. To check/jump the low pressure switch, don't run a wire from the battery. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. '96 XJ here. I add oil, per the table in the Bentley manual, when I replace a component, or the compressor, or I have opened the compressor and lost some oil. Check the front side of the clutch to examine its condition. I have a lab-grade vacuum pump I use on automobile AC systems for about half an hour that draws a pretty good vacuum, and then when I hook up the can and the gauge the cutout usually is activated right after I crack open the valve and let the gas flow in. I put a new compressor, filter drier, txv, flushed the system, vacuum and it did hold the vacuum, i put 700ml (24 oz) of freon r134, but my compressor does not engage? My ac's blowing warm air and a chirping sound seems to be coming from the rear of the compressor. above sea level or more. But you can alternate between gas and liquid just by turning the can up right for gas and inverted for liquid and oil. http://forums.tdiclub.com/showthread.php?t=141298, http://forums.tdiclub.com/showthread.php?t=242699. Use a stiff piece wire bent in a U shape to jump the plug (should be just two wires) stick your jumper wire in the plug. If your AC compressor kicks on, then you know the system is working. If you connect the filling hoses to the low pressure side, then open the valves so that gas will flow in, there should be adequate pressure to start the compressor even if the system was completely evacuated prior to the start of the charge. Freon will flow in much faster with the freon bottle upside down. Reason is that the pressure sensor is just that, a sensor and NOT a switch. Freon will flow in much faster with the freon bottle upside down. Use a stiff piece wire bent in a U shape to jump the plug (should be just two wires) stick your jumper wire in the plug. Unplug the plug on the low pressure switch. How To Jump 2 Wire Ac Pressure Switch So ive sent him back to the place that regassed the AC to have it pressure checked.

Center of clutch doesn't turn when the a/c is turned on. JavaScript is disabled. Even a paper clip will work.

A forum community dedicated to custom off-road vehicle owners and enthusiasts. many sensors share the same power source, check any drl fuses.

To answer the first question, never never never jumper any connector on VW AC systems made since 2000. Hi guys can somebody tell me why my new compressor is not kicking in?


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