Ambient Temperature (°F) Low Side High Side
------------------------ --------- -----------
90° 50-55 psi 250-275 psi
85° 50-55 psi 220-250 psi
80° 45-50 psi 175-220 psi
75° 40-45 psi 150-175 psi
What are the symptoms of a bad expansion valve?
- Car AC system isn't cooling enough or won't cool at all. ...
- High side pressure is high. ...
- Air coming from vents is frosty. ...
- AC blows cold, then hot. ...
- AC kicks on and then immediately kicks off. ...
- Airflow drops dramatically from vents.
What causes low pressure on low side of AC?
Refrigerant migration deals with refrigerant migrating back to the compressor's crankcase during the off-cycle. This migration is due to a pressure difference between the oil in the compressor's crankcase and the refrigerant. ... This is actually a restriction in the low side and will cause low suction pressures.May 6, 2019
Why is high side AC pressure low?
Higher Low Side and Lower High Side Pressures Too much refrigerant is flowing into the evaporator. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. The orifice tube is too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing.Jan 25, 2019
What is normal AC pressure?
The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Pressure that is too much lower or higher shows there is a problem. On a properly working system, high-side pressure will be about twice the ambient temperature, plus 50 PSI.
Why is my high pressure side cold?
Most likely problem is a clogged drier. If one is not used on your system the next best guess is a clogged expansion valve. I would make sure they install a new drier during the repair.Nov 18, 2010
Why is my high side AC pressure low?
Higher Low Side and Lower High Side Pressures Too much refrigerant is flowing into the evaporator. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. The orifice tube is too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing.Jan 25, 2019