Recover the system. Probably low on charge. Remove the expansion device, and see if the tractor factory left any junk in the system when they assembled it. Those cars are rarely high mileage vehicles. Leaks over time while sitting are more common. Unless you bought the car from Ed Bolian... Wow you...

The client has the vehicle now

Just curious what can cause 150psi on high side while car is off, and somehow drops to 50psi while the car is running

Most ac issues on 2000’s Mercedes are caused by the “duovalve”, more specifically a coolant valve that blends heater core air with specific climate zones within the car. If you have one cold vent, and others are warm, it’s almost always the coolant valve

This is my first post in the forum, for some background I was a Mercedes Benz technician for a few years, and am certified in auto r134/1234 systems I have since opened my own repair company, servicing primarily Mercedes, and have started branching out into more Lamborghini, Ferrari, Rolls Royce, Be...