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look for a port on the aluminum ac pipes on the driver's side of the engine compartment next to the suspension tower. Port might be on the underside of one of the pipes, marked with L.
Usually on modern cars the ports are pretty fail safe...you can't hook up to the high side with a standard DIY R134A recharger/kit.
2007 dodge charger ac recharge connection
Your 1991 will have R12 refrigerant in it unless it has been retrofitted to the newer R134a refrigerant. If it is still factory original then you will need to retrofit it to the new refrigerant, or see if you can find some R12. R12 has been discontinued years ago and if you can find it it is very expensive.
This is usually a result of not having enough refrigerant in the system. You may have a leak or it may just be time for a recharge. Bring it to your mechanic and have them evacuate the system and recharge it if there are no leaks. If there is a leak, dye can be added to find the leak once it's recharged. They might also have a 'sniffer" that can find leaks while the compressor is running before recharging it.
mcdevito75 here, Follow each steel line , the one that goes into the firewall is the 1 you need find the port on that tube and recharge your A/C, plus your rechrage kit should only fit this port. Chargeing port may be covered with a brass like cap un screw and there"s the port.
If your talking about the low side sevice port to charge your ac, its easy to find. With your recharge kit, it comes with a nozzle to attach to this lowside port. Each port, (lowside and highside), are different diameters. The charging nozzle will ONLY fit onto the lowside port. Just run the length of your ac lines from the compressor and trace them back to the firewall. You should find both ports before you hit the firewall.