1999 century ac problems

Find a set of A/C gauges to ck. for low freon?

 

prolly the valve on the hot an cold selector thats what it was on my classic put a manual valve on the heater hose

 

1. low freon 2. hot water is turned on 3. turn unit to recirculate 4. winter front still on or dirt and bugs on a/c coil. if i remember correct there is a turn on toward the front by frame rail on r/s easy to miss. lots of luck

 

If the compressor clutch is engaging then you need to hook up gauges and see what is going on.

 

The valves to the heater core should be a couple degrees difference - not the difference between the AC getting cold and not getting cold at all.
If it's low refrigerant, then you've got a leak. I see people saying to spray a soap and water mixture on the lines to find it, and... yeah, I do that, but the difference is that I evacuate the refrigerant, then put about 250 psi of positive pressure throughout the entire system with nitrogen... just spraying soap and water on the lines, you risk contamination of the refrigerant if that leak is on the low (vacuum) side from it being pulled into the system.
There's several reasons why an AC system won't get cold, and just tossing refrigerant into it isn't going to be the answer... too much refrigerant and/or PAG, and you'll have the same problem with it not getting cold, as well as excessively high system pressures which could damage AC components.
Low refrigerant, excess refrigerant, blockage in the system, damaged fins on the condenser, etc, etc... plenty of possibilities why it could be blowing warm. The long and short of it is that AC really isn't a DIY thing.