I just recharged my 95Z. with a kit from wal-mart. It went fine. When I attached the kit to the low pressure valvue it gave no reading and would not kick on the clutch. When I opened the can I starting getting reading and the clutch kick in. Now it works fine. Now when i went to do my roomates Mustang Cobra the A/C clutch kicks on and off and wont blow out cold air. Also the pressure goes up and down with the clutch kicking on and off. This happens every five seconds. The reading goes from about 12psi to 44psi. as the clutch is kicking on and off. What is wrong with his A/C I didnt recharge it afraid of causing more damage.