First off, you really need to monitor both low AND high side pressure and watch the sight glass.
Secondly warm air does not necessarily indicate a problem with the refrigeration portion of the climate control system. The temp is regulated via coolant flow to the heater core. To isolate whether or not the coolant flow is the problem, temporarily block flow to the heater core somehow. If blocking coolant flow cools the vent temps then that is the portion that you need to troubleshoot.