I have a 2004 Mercury Sable, and the check charging system icon keeps coming on. I have taken it to 3 mechanic and they can't find anything wrong with it (battery or alternator). The abs light, air bag light, and check breaking system icon keeps coming on, then my car falls dead.
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If it runs you have one of 2 issues. 1. The battery is bad and the alternator isn't able to keep it charged (you will have to jump start it every time the motor is shut off). 2. Your alternator is bad and the battery is running the car (when battery is drained car will stop running) which is my belief as the battery light only comes on when the alternator isnt charging. Have the charging system tested at your local AutoZone/Advanced Auto parts store they normally do it for free.
The port closest to the firewall would be the low side where you charge the line with R134 refrigerant. Use gloves and clear goggles to protect your eyes and skin when connecting. The quick connect fitting will ONLY fit on the low side so you can't connect it to the wrong connector (size won't match if you select the high side near the front of the car).
Place the AC on MAX while you charge the system. I recommend purchasing a quick fill kit that has the gauge built into the charging line so you can see the pressure when you let off the trigger. Don't let it approach the red or system will stop working (overcharging the line is not good) These can be purchased at auto parts stores and department stores.
i have the owners manual that shows how to replace all the light bulbs. if you have not figured this problem out. i own a 2004 Sable, also. I am having issues with my battery dying all the time but the system check says that my charging system is OK. but at AutoZone thier machine says the alternator is only putting out 12-13volts and it should put out 14.5volts...any suggestions besides calling a service department