:Banghead Well an up date. the high side pressure is closer to where it should be but, the low side is still at 13-15. There is no valves for heater lines just the electronic control. Along with the dealer we have come to a conclusion that it may be an clogged line filter or orifice tube. Some say we hit 105* today and got 70* air at the vent , so i guess i cant complain too much ? I am still thinking about swapping out the line filter though. just to pass on info the dealer said it takes exactly 2.9 lbs of refrigerant. I hope i quoted him correctly.Any other thoughts would be great and thanks to those who responded!:notworthy Maybe my troubles can help some one else
You need to change your liquid line drier....with the pressures you mention, you have a restriction on the high side at your metering device...(orifice, cap. tube, or expansion valve, whichever you have)...
Rule of thumb is you should be running anywhere from 30-35 lbs on the suction line (low side) that would be a saturated vapor temperature of 34*-39*...and with at least a 15* delta T, you should be blowing out 49*-54* air.....
The suction pressure you mentioned, 13-15 psi equals a saturated vapor temperature of 11*-14*, which would be common if it were a freezer....but it is starving the evaporator....
And just FYI.....R134A has a critical point (no cooling properties left) at about 275-280 psi....so air flow across the condenser is critical on those 100* days.....always keep it clean!!...head pressure always runs higher on equipment/cars because of the engine/radiator heat and the variable speed of the compressor.