What Causes High Low Pressure and Normal High Pressure in Car Air Conditioning?
1 Answers
When a car's air conditioning system shows high low pressure and normal high pressure, it may be caused by a malfunctioning or damaged air conditioning expansion valve. Below is more information about high low pressure and normal high pressure in car air conditioning: 1. Solution: The solution for high low pressure and normal high pressure in car air conditioning is quite simple. Just remove the air conditioning expansion valve and check if it is functioning properly. If it is indeed faulty or damaged, simply replace it. 2. Normal operating pressures for high and low pressure: Under normal conditions, when the compressor is running at 1500-2000 rpm, the high pressure should be around 1.5-2.0 MPa, and the low pressure should be around 0.15-0.35 MPa. If the ambient temperature around the vehicle is high, the high pressure may reach around 2.5-2.8 MPa, but it generally should not exceed 3.1 MPa, otherwise the pressure protection switch will be triggered. 3. Note: Since the car air conditioning system's expansion valve is located on the firewall side of the vehicle, disassembly is quite inconvenient. Additionally, temporary recovery of the refrigerant is required, making the process labor-intensive. Therefore, it is recommended to visit a 4S shop for this service, as attempting to do it yourself may lead to the opposite of the desired result.
