2002 2500 4x4 usually have to charge the system every spring and it last thru the AC season, same deal this year except the compressor clutch only engauges for about 10 seconds at a time? Any ideas on where to start looking to resolve?
Any help would be greatly appreciated!

 

I'm guessing the system is still a little low and the low pressure switch is causing the compressor to kick in and out. If you put a set of gauges on it you'll probably see the low side pulling into a vacuum and the high side building pressure when the clutch engages. Slowly add refrigerant until the clutch stays engaged, but be careful not to add to much refrigerant.