How to Check if the Exhaust Valve is Faulty?

[Timothy]

Methods to check if a car's exhaust valve is faulty include: 1. Blue smoke from the exhaust; 2. Severe suction phenomenon when opening the oil filler cap. The professional term for the exhaust valve is the pressure control valve or oil-water separator. The exhaust valve is installed between the compressor outlet and the condenser inlet, and its function is to improve the heat transfer effect in the condenser and evaporator through separation. The working principle of the exhaust valve is: high-pressure gas from the compressor enters the guide vanes of the exhaust valve, flows spirally along the guide vanes, and separates the lubricating oil from the working gas by centrifugal force and gravity, leaving it along the inner wall of the cylinder.