Maximize AC Efficiency Unleash the Power of the Automotive AC Pressure Chart

Low side pressure should sit right at 30psi at all times the compressor is on, within a couple psi is OK. High side pressure will change ... Before the vehicle is started, the static system pressure can be read. ... The PCM gets inputs from the HVAC switch, and from the AC pressure ... Question: should I put more freon to raise the pressure as per the chart or leave it alone. ... When I worked as an auto mechanic the gauges ... I see charts that show, at 90 degrees, a low side of approx. 30 psi and high side of 225. Another chart will show 50 PSI and 260 PSI. The online chart shows i need 55 psi on low and 170 on high. I am checking the pressures while engine is warm and idle. Ac on full blast. Ac worked very good ... Measure the ambient temperature and compare the reading with the pressure-temperature chart of R134a below: In my case, the ambient temperature ... According to your ambient temp and pressure readings you are probably slightly low on charge. ... Automotive for Marine · $7.39. If the Ac high pressure side is only at 175 psi and the low is 33psi ... do you have a copy of the values chart you used? img. logo. Ford ... Shut the car off for 10 minutes then started AC compressor kicked on and got cold but gauge reading was off the chart. He recommended replacing ... During the winter (Dec, Jan, Feb) temperatures were about 20°C (68°F) and I was not driving a car heavily - mostly in evenings and AC seemed to ...