Turn the ac on at first and the compressor wouldn't kick on or off. Hooked the gauges up and had about 68 and 48. Now the clutch will ice on and off with the switch and reading abot 70 and 50. It won't really take any freon and the lines won't are staying warm. Any advice?

 

Somewhere, you have a leak and are low on R134a. Check the fittings and condnser for physical damage and leaks. If you have the manifold set, hook 'em up and try to add a little R134a thru the low side. Invert the can so you get liquid. The Hi and Lo pressures you indicate look like running pressures, static readings would be equal since the system equalizes the hi and lo side. The system will only take a charge when the compressor is running or if you have fully evacuated the system. i.e. 30 inches of vacuum. If you can get it to suck some freon and verify the AC compressor works correctly, I'd borrow a vacuum pump and pull it down as far as you can, add some AC dye and then charge it. DO NOT OVERFILL. R134a is very quirky and there is a very small window of efficiency. I bought my truck from a wholesaler in Houston and when I finally got around to servicing it, it was overfilled by 14oz. More is not better! The dye is cheap and some 134a already comes with the dye.

If you have to open the system for repairs, use the vacuum pump and pull a vacuum for at least 30 minutes when done to remove all moisture. Don't forget to change the receiver/dryer, it functions as the system filter and is cheap insurance.

 

Only invert the can if the system is NOT running. Liquid going into the suction side of a running compressor is not good.

 

Thank you for the advice. I dont think the compressor is running and im not sure if it's cause the safety switch is bad or if it's low refridge. It sound like it'll kick on because when I turn the ac in the engine will pull down for a sec. I had our mech look at it at work and he said something about an internal clutch on the compressor an can't really tell that it's running properly. The pressures aren't changing when it does this so I'm assuming it's not. I'm also hearing a squeak so I'm not sure yet if it could be the compressor making noise or if I have another problem yet

 

I stand corrected!

 

This is a pretty common problem. There is a link on another site that describes a possible simple fix. It's probably clutch getting worn and drawing too much current from the TIPM. My 06 did the same thing.

http://www.cumminsforum.com/forum/3r...going-bad.html