Look at the pointer on each gauge and the number it is pointing to is the pressure in psig. Under the pointer and below the pressure scale on the face of the gauge are 3 or 4 different colored temperature scales. Each color refers to a particular refrigerant. Determine which refrigerant you are using and the number in that scale is the corresponding saturation temperature at the pressure you are operating at. For example R-22 (light Green scale) at 70 psig = 40*F saturation temp.
For 410A
With AC pressure gauges and manifold assembly. This is best done by a professional.
You need someone with a set of AC manifold gauges to attach to the Hi and Low service ports and monitor the pressures to determine how much if any freon is needed.
The R134a professional manifold gauge or gauges uses three hoses that each connect to the low and high ports of an AC system. The remaining hose connects to the can refrigerant. Use the gauges to check for leaks and see how refrigerant is need to refill the freon.
You need more than a diagram. You'll need a manifold gauge set, and the know-how to determine what the numbers on the gauges are indicating is wrong with your AC system.
jump a hot wire downt to it with it running with gauges on it and read the readings.
Go to autozone and get a manifold vacuum ac gauge for R134a. Ofcoarse, also pick up a can of R134a. Hook up the gauges to the valves on the AC hoses. Add the refrigerant but watch the pressure on the gauge!! Any good manual will tell you the max pressure for the system.
Manifold gauge/gauges are used to check both the high and low side pressures of the refrigerant inside the a/c system...................
Manifold gauge/gauges are used to check both the high and low side pressures of the refrigerant inside the a/c system...................
You need gauges to properly charge it.
You need gauges to repair AC.
Sounds like you may have a bad rear thermostatic valve in the rear AC unit. One way to check is to get some AC manifold gauges, start the car, turn on just the front AC, check the gauges, and have someone turn on the rear AC. While this is happening, see if there is any change in the pressure readings, if there is no change, then you have bad valve, If there is a change (and I mean 10 - 20 psi) then you system may be undercharged, which means you need to locate and repair the leak and recharge the system.
Usually around 220.