I've got a '98 Dodge Ram 1500 5.2 V8 that has an AC issue. It started cycling between cold air and ambient air at random intervals and it has been getting worse. Now it will blow cold air when the engine is cool, but when it heats up it blows ambient air. The compressor clutch is not engaging when it is blowing warm air. I had it serviced and it has the proper amount of R134A. Any suggestions on what to do next would be appreciated.