What is the normal air conditioning pressure for a Jetta?
2 Answers
Under normal operation of the air conditioning system, the low pressure is generally between 1.0—2.5 bar, and the high pressure is between 15—18 bar. Normal values for automotive air conditioning pressure: The normal range for high pressure in automotive air conditioning systems should not exceed 1.7 MPa or be lower than 1.3 MPa, while the normal range for low pressure is generally not lower than 1.15 MPa and not higher than 1.25 MPa. If the low pressure is higher or lower than this normal range, it indicates abnormal expansion valve regulation. Abnormal refrigerant supply: The most common issue is clogging of the expansion valve or orifice tube. When the system is too dirty, the desiccant (silica gel) in the receiver-drier breaks down and flows with the high-pressure refrigerant liquid into the expansion valve or orifice tube, where it can easily cause blockages in the narrow passages. This leads to abnormal refrigerant supply and prevents the system from operating normally.
Having worked in the auto repair industry for many years, I frequently encounter Jetta air conditioning pressure issues. The normal pressure values should be maintained between 150-250 psi for the high side and 25-45 psi for the low side. Both excessively high or low pressures can affect cooling efficiency. In summer, as temperatures rise, the pressure might be 10-20 psi higher than normal, which is quite common, but prolonged imbalance can lead to refrigerant leaks or compressor damage. I recommend that car owners visually inspect the condenser for blockages before driving and pay attention to smooth air conditioning operation sounds during regular use. Abnormal pressure not only affects comfort but also increases fuel consumption, so it's advisable to have a professional technician check the pressure with gauges every six months—don't wait for small issues to become big problems. Regularly replacing the refrigerant filter can also extend the system's lifespan.
