Had parked my Linea without use for around 20 days. On Sunday, had taken it and after driving for 30 km and then switched on the AC. To my surprise, the AC is not blowing any chilled air. The heating part is working though. Found an AC mechanic nearby and checked with him. There are 2 AC tubes valves in the engine bay. One underneath the coolant tank and the other which is left of the coolant tank. He removed the coolant tank and fixed the gauge underneath it. It shows 4 BAR (40-50 psi) of pressure. He said that there is no Gas and needs to refill it. My doubt is whether the leak is ruled out here? I assume that if there is a leak, both the High Pressure and Low Pressure gagues would read zero. Am I Right? I refilled the refrigerant 2 years before. It was working 20 days back and all of a sudden there is no gas. What would have happened to it? Shall I go ahead and refill the gas without checking for leaks (vacuum check..)?