I recently replaced the heater core on my 2000 jeep cherokee sport. When I tried to recharge the system at the dealer it Held a charge and cycled one time, but not again. I replaced the relay and the problem still exists. Any ideas what I should look into to solve this problem?

 

Did it hold a good vacuum before you charged it? My first guess is there's a leak somewhere.

 

The a/c held a vacuum prior an still holds one. The compressor cycled one time it showed a presure of 24 on the low end and 145on the high end.

 

How exactly did you "try to recharge the system at the dealer"? In the parking lot, with an AutoZone special? While the dealership watched and laughed at you? lol

All kidding aside, someone correct me if I'm wrong, but that low side pressure might be too low. I think it depends on ambient temperature as well. When you were charging it, was the compressor running? It needs to run to take the charge.