My 1999 Suburban's A/C started to lose its cooling capacity last fall. In late fall it stopped cooling completely (there was a mechanic involved with other parts of the vehicle at the time). This spring it still does not cool, although antifreeze levels are good.
I'm planning on checking refrigerant pressures -- there might be a slow leak and the levels might be low.
If the pressures are low, we're going to start with a full recharge. I plan to evacuate the system completely and properly dispose of the old refrigerant, then recharge the system. I will also add some fluorescent dye.
Currently all the A/C parts are still OEM original. Since there was no parts replacement, would that eliminate the need to add oil? Or should I still include oil during the recharge of the A/C?