On my 98 GMC Somona my AC creates very cold hoses and accumulator but the cab vent air is 80 deg.?

Question

I have 45 psi on the low side port at the accumulator. (at 80 deg ambient). Water is being produced from the drain line as expected.

I suspect the Temp Selector on the dash. How does it work?

How can I test? Any other possibilities?

Answer 1

45 on the low side what about the high side also 45? clamp off both heater Hoses if you get cold air then replace your heater valve and if you have electronically controlled temp with in car and ambient temp sensors then take it to the nearest A/C shop electronic control can get a little complicated.without checking your Vehicle this is the best I can do for you

Good luck.