What causes AC pressure to fluctuate dramatically?
The main factors that affect the A/C system pressures are the ambient air temperature and the RPM of the engine. The pressure rises proportionally when the outside temperature increases or the engine is accelerated.
What should my AC pressure be with the compressor off?
That’s normal with the compressor off. Then watch the pressures when you turn it on. The low side will drop to 25-40psi, and high side should go to around 150-200psi.
Why does my air conditioner have low pressure?
There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. One symptom indicating a complication in the air conditioning is AC low side high, high side low pressure.
What causes the a / C pressure to go down?
Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. it’s hard to make a guess. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed.
What does it mean when your AC pressure is on both sides?
If there are readings on both the high and low sides but they are not the correct specified pressures, it means that certain parts of the AC system are not functioning properly, such as the expansion valve, compressor, and clutch. AC pressure readings and what they mean
That’s normal with the compressor off. Then watch the pressures when you turn it on. The low side will drop to 25-40psi, and high side should go to around 150-200psi.
There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. One symptom indicating a complication in the air conditioning is AC low side high, high side low pressure.
Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. it’s hard to make a guess. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed.
If there are readings on both the high and low sides but they are not the correct specified pressures, it means that certain parts of the AC system are not functioning properly, such as the expansion valve, compressor, and clutch. AC pressure readings and what they mean