[miked79928]

As the title says, my 04 Yukon XL blows ice cold from both units while driving. However, at a stop light or in park the temperature of the air warms slightly. It will sometimes also blow hot. I checked the pressure using one of the units available at auto parts stores, and it was a low. I added refrigerant and the issue got a little better. I am thinking the fan clutch may be going bad? The truck doesn't overheat at all and in fact stays at mid-gauge throughout operation. Am I correct in pin-pointing the fan clutch?

Also, I know on the and up the TPS tells the pressure for each tire. Is there a way to get this same feature on my? Would it be possible through a software upgrade or replacing the entire DIC?