Originally Posted by
Southernscrew
When the car runs out of Freon the low pressure kicks the entire system off to protect components. You can cross the wires on the low pressure switch and the system will come back on. If that works replace the low pressure switch. Just guessing as I can't see the car. When you cross the wires on the low pressure switch you can put more Freon in as the compressor should come on.
Ken
Disclaimer... Only people familiar with A/C systems should work on them. They are dangerous to life, limb, and property if mishandled or abused.
READ THE ONLINE (OR PRINTED) SERVICE MANUAL CAREFULLY! Be careful adding Freon to this or any A/C system. If you KNOW the Freon leaked out and it is almost totally empty, find and fix the leak (don't leave the system open to atmosphere any more than necessary), and buy three of the 12oz cans of R-134 (some of the compressor/system oil may have leaked out when the leak occurred so use your best guess on getting one of those R-134 12oz cans with compressor oil included in it, don't add too much compressor oil as it is just as bad to have too much throughout the system). DO NOT RUN THE COMPRESSOR UNTIL YOU VENT AS MUCH OF THE AIR/MOISTURE OUT OF THE SYSTEM AS POSSIBLE BY PUSHING IT TOWARDS THE OTHER ACCESS FITTING WITH THAT 1st (STRICTLY GAS) FREON CAN ON THE LOW PRESSURE SIDE. Use about 4oz of this one can to vent the air/moisture out of the system SLOWLY, I repeat SLOWLY (of course almost every state/jurisdiction makes self service of A/C systems/venting of Freon ILLEGAL so be warned). If you do not displace ALL the air/moisture that may be present inside the system you'll ice up the needle valve/expansion valve and it will not function properly (short cycle). NEVER add Freon to the high pressure side of an A/C system. Always add to the low pressure (gas) side as the liquid line side is of a very high pressure, especially just after shutting off AND anytime the compressor is running. Its specified total capacity is slightly under 2lbs of R-134. Overcharging the system makes it unsafe and prematurely wears out components like the compressor, evaporator, D/X coil and fittings/lines. Finally, please remember the compressor may kick on/off based on a number of sensed conditions and should be treated like it could kick on at any time (which is why you should never hook up a refill to the high pressure liquid line side). Before you post a reply, the fittings sizes are different, you would be surprised how many make an adapter to use the 12oz and 16oz cans of R-134 and access the high pressure side at the front grill location in auto systems. I have seen what the high pressure side of an auto A/C system can do to one of those retail refill cans. They are not designed to handle the very high pressures associated with that liquid line. Please be careful!