Every time I took mine in to find the fault - they regassed it. I asked them why they had put gas into something they knew was leaking and they shrugged. Every time it would work for a few weeks then die. They asked if I wanted them to change the evaporator and I said, No, I'd like them to locate the leak but they couldn't. Finally a little independent garage said, "try this stuff - it's new." It's a special leak sealer for car air conditioning. It cost a few quid but cheaper than regassing. That was months ago. Still going strong. Winter demisting works in seconds. I'm well chuffed.