probably a bad heater control valve, not letting coolant get into the heater core
14.7psi is atmospheric pressure, it won't leak itself into a vacuum lol
HAHAAHAHAH WOOOOOWWWWW...no wonder, thats makes perfect sense..i NEVER thought of that...so long story short..im loosing ALL my freon lol..im soo dumb for not rememerbing that atmospheric pressure is 14.7
2001 Regal GS, PLOG, 3" DP, 1.9's/L76 springs. 21* of timing on a 3.4"