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In order to recharge the A/C you have to have the car running and it will take two people to do it or you will ruin the system. You recharge the system with someone sitting inside of the car(while running). If at any point in time you only get a partial recharge, you have to empty all of the fluid out of the system and start over again so you do not ruin your A/C Condensor(because it costs about 300 bucks).
Usually a recharge connector or "saddle valve" is brazed onto the suction line for recharging the system. The system leak obviously has to be corrected and the system must be pressure tested with nitrogen before vacuming the system and ultimately recharging it.An A/C system operates in a vacum and if there are contaminants or a leak it will not work properly. I'm not being facetious here, I just don't know how much you know about A/C systems.
It should take the freon . Compressors will actually pull a vacuum if the refrigerant is completely exhausted. You should be able to recharge system if the unit is just low on refrigerant.
If no pressure is in system, I would have the accumulator replaced and have a vacuum pulled on the system before recharging it. (The accumulator has a dessicant/ filter in it and may become clogged if the system is empty) The vacuum is to boil off any moisture in the system from having it open and also to check for leaks. If moisture enters the system because of a leak then it can freeze in the metering device when the system is recharged. I hope this helps.
A simple recharge on a system that old is usually wasted money. There are several components which may have reached the end of their service life. Best thing is to have a good tech check for leaks and functionality, if all is good then recharge. Otherwise you may find that the system is not working a few days after the recharge.
Your car ls most likely low on refrigerant. If you're handy, you can get a recharge kit at an auto parts store to recharge your AC system. If not, most service stations will recharge the system for under $100 but be aware that they are mandated by law to detect any leaks prior to recharging the system. If a leak is detected, they must repair the leak prior to recharge which would lead to a more expensive repair. Best of luck.
Greg
Check the fuse first to the A/C to make sure it's has not blown. The other thing to is the system may be low on R143a. If you not to familiar with recharging the system you can take it most shop now and have it serviced. Call around first for the best price to recharge the system. You can buy a recharge kit for around $50.00 but that's around the same price to recharge the system and you don't have to worry about over charging the system causing damage. The recharge kit can be bought at Wal Mark or any large parts store like Auto Zone. Here is a link on how to recharge the system your self if that's the method you wish to go. Good luck and hope this helps, Keep me posted. be glad to cool all summer. http://www.cyberbright.com/autobin/air_conditioning.htm
If the AC is not blowing cold air anymore, then yes, recharging will help. However, the AC system is a sealed system and should never need recharging. So if it does need recharging, then there is a leak in the system somewhere that has to be fixed first. It can be a little pricy, so be sure to call around for quotes.
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