What should be pressure in car ac hoses?
I have honda civic 2001. And ford freestar 2005. I have bought a manifold gauge set with low and high pressures gauge plus for refilling hose.
i would like to know what should be pressure in the hoses to make sure that i have enough freon and if need how much should i add freon.
Don't mess with your AC system. This is not a DIY repair.
Take your car to a professional repair shop.
It is not big deal, I just want to confirm the pressure
Hi so not enough information here.
The absolute pressures vary too much with outside temperature, humidity, system design and capacity, elevation above sea level, etc. Overall pressure recommendations would be useless. The only way to really know if the levels are correct is to pump out the refrigerant down to hard vacuum and then refill with correct amount. Your manifold set is still useful for seeing if the compressor is good, using relative pressure. With everything hooked up and running, you should have about 200 psi difference between the high and low sides. If that difference is below 130 psi or thereabout, your compressor is failing.
Between 25 and 345 psi, depending on the ambient temperature, what the A/C is doing at the time, and lots of other factors. You could measure the pressure with the system off and settled out, but all that would tell you is if there's any refrigerant at all in the system (even if it is to little for the system to try to operate). Yes - the pressure, which is the vapor pressure of R-134a at whatever ambient temperature it is, is exactly the same whether the system is seriously undercharged or seriously overcharged. The relationship between the high and low pressures is too complex for any but a trained professional to understand.
If you are planning to recharge the system, you will need it discharged by a professional and can then follow the instructions in this video. Personally, I do most of my own maintenance but leave A/C to professionals.
If the system still has 134a in it and is low I just add 134a until I have 40 degree air coming out of my center vents on an 80 degree day.
If you want to be precise with filling the system evacuate it and add the 134a by weight according to the yellow AC tag in the engine compartment.
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