90 GT, 5spd. A/C system was converted to R-134a by previous owner, was never cold since I owned it (a few months) . I replaced O-rings in the liquid line I found that were leaking. I did not vacuum out the system like I should have cause it was pretty much empty. Recharged system. Not blowing cold. Found cool/heat cable for blend door was seized, blend door moving fine fixed that still not cold. Re checked for new leaks and all good. Clutch engages and disengages. All fan speeds work, all defrost, dash vent and floor vents work as they should. NOTE: heater core has no hoses because it leaks. Core still there but hoses gone (previous owner). Checked and rechecked all vacuum lines. Checked pressure with gauges AGAIN, still holding. A friend said to vacuum the system and recharge as I could have an air pocket in the line?. My last attempt is to have one of you throw some wisdom at me before I pay for a shop. Thanks.