I was going to fill the refridgerent/freon in my car and after I hooked the gauge up to the low pressure port the gauge read in the "warning" level at a little above 100 psi. My car dash says the freon is low and the air is luke warm. The compressor is off because of the low level of freon...
There is one valve on the large diameter tube next to the fanbelt and compressor and there is another valve near the driver side of the car, I know one is the High Pressure Port and one is the Low Pressure Port, do you know how to decipher?