Notes from Dr. Borkosky

1965 Scout 80 7.3PSD/ZF/203/205 D60F/14BFF. To check/jump the low pressure switch, don't run a wire from the battery. 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. Probably has low R134A.

VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. above sea level or more. '96 XJ here.

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. 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. Before I start replacing parts I want to rule out possible electrical issues first. It cannot be safely jumpered around. Even a paper clip will work. The three wire HP sensor is not a switch. Also, find out whether the clutch and the pulley are spinning. History does not long entrust the care of freedom to the weak or the timid. 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? You will damage your circuitry, of if lucky, just blow a fuse. Locate the A/C, and find the pressure switch attached to it. 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. Even a paper clip will work. Even better if the system has had a vacuum slapped on it before you try refilling.

Is the compressor clutch engaging at all ? Hi guys can somebody tell me why my new compressor is not kicking in? Freon will flow in much faster with the freon bottle upside down. Putting the can in a warm 120 deg water pan will also help. 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. I need to put in some freon and the pressure is so low that the pressure switch won't let the compressor kick in. It was my understanding you shouldn't introduce liquid into the compressor as it could wash out the internal seals. Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more! My ac's blowing warm air and a chirping sound seems to be coming from the rear of the compressor. 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. A forum community dedicated to custom off-road vehicle owners and enthusiasts. 5 (Nil) 5 (Z) Grommet 100 V 100 V or less — 1 (M) IC circuit — IC circuit IC circuit — IC circuit — IC circuit. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Please help. Like a second or two inverted and then back upright. You must log in or register to reply here. If your AC compressor kicks on, then you know the system is working. As a guy who did (commercial) AC and Refrigeration for a living, I guess its somewhere around 35 years or so now. 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.

many sensors share the same power source, check any drl fuses. Probably just needs a recharge. If you jumper connectors, you WILL burn stuff up!

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? Center of clutch doesn't turn when the a/c is turned on. http://forums.tdiclub.com/showthread.php?t=141298, http://forums.tdiclub.com/showthread.php?t=242699. 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.

If your AC compressor kicks on, then you know the system is working. Advice about not dumping liquid refrigerant into the low side of a compressor is correct. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. JavaScript is disabled. Check the front side of the clutch to examine its condition. 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. To answer the first question, never never never jumper any connector on VW AC systems made since 2000. I can confirm that a can of R134a should provide enough pressure in an empty system to kick on the pressure-cutout switch. But you can alternate between gas and liquid just by turning the can up right for gas and inverted for liquid and oil. Unplug the plug on the low pressure switch. 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. 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. 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. To check/jump the low pressure switch, don't run a wire from the battery. JavaScript is disabled. Removed the belt and clutch center turns no problem. My 03 Jetta has a three wire plug pressure switch on the large line close to the firewall. 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.

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