Auto Air Conditioning & Heater Repair: AC Pressures, thermo fan, fan clutch

Question
98 Chevrolet 1/2 ton Z71 350 vortec  What should my pressures be low and high side at idle and 2200 rpms?

Answer
Well it depends on tempature and humidity at idle it would be around 40-45 psi low  220-250 high - @90 Deg 50% hum  2200 30-38 low-  high side side should be near same with thermo fan clutch pushing good air flow, high side will vary when the fan clutch changes w/heat load  check the pressures at full engine warm