99 T&C limited, how do I disable the AC low pressure cut out switch so I can recharge the system. We have replace front and rear expansion valve, AC blower dryer on 99 town and country 3.8 LXI with rear air. We discovered a leak on rear, fixed the leak, now we have no leaks. However it will not charge, on gauges on low side goes to 110+ PSI. We don't have leaks... Please HELP ASAP. Compressor spins, have jumpered to ensure on relay.
Whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch
Low side should never read 110 means it was overcharged. normal readings are about 30-50 lbs on the low side. the pressure switch reads high and low if the pressure gets high it turns on the compressor low shuts it off however the high side also has a pressure switch if it gets too high it shuts off the compressor. **** down the system and pull it into a vacumn start the vehicle and put the ac on full blast. then charge it with freon on. no matter what the ac system will take some freon to turn on the compressor. but make sure that expansion valve is the right one that matches up to the old valve there are too many valves that dodge has made that part stores get them mixed up with another vehicle that has different features.
no there are no different kinds of vacuums. an ac vacuum machine may vary in size but do the same thing no matter how big the system is. the best machine to use is a full size ac machine that can pull down the system while gauges are hooked up to test for leaks as well as charging with no problems or swapping of hoses. whether they didnt want to do it, didnt know what they were doing, or it was closing time and everyone wanted to get out of there. make sure to go to a respectful well known shop that offers free ac check as they can pull down the system watch the gauges to make sure there are no leaks and leave it there free of charge, or let them charge the system with exact amount of freon, dye, and oil.
×
1,377 views
Usually answered in minutes!
Are their different types of systems vacuums. Went to a Jiffy Lbe place, hey vacuumed but said i had to go to another shop because their equipment (vacuum) could not do major clogs. Were they pulling my leg because they just didn't know what to do. Or are there different vacuum types?
×