Quote:
Originally Posted by Overboost
275 psi looks real high on the high side. I thought that should be 175 psi
Mine sits at 35 low and 175 high
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Wow, that's low. Unless ambient temp is 70 degrees or so. It like to do service between 85-95 F. My non variable compressor vehicles blow A/C at 42 F!
I do my own A/C work. I can get my '00 Ram to 39-40 F on a good warm day going down the road.
The X5 had good low pressure. It was close to 48 PSI. It sucked in R134 really fast. I had to turn off the valve quickly. It used less than 1/4 can. It was enough to start blowing cold air within seconds of starting up. It was taking a few minutes to blow cold unless you took off driving down the street ASAP. It was 90 degrees so low side 45-55 PSI low - 250-270 PSI high side is max range for R134. As pressure increased, fan speed also increased. Another 5 F degrees ambient temp would add another 5 PSI to low side and 25 PSI range to the high side.
What pressure really tells you is system work conditions. Good suction, good pressure, and overall condition.