A/C on 95 Chevy Camaro, Heater Core on 95 Chevy Camaro?

ok, just changed out the A/C Compressor (also entire system) on this Camaro, pressure tested it, Filled it and now their is no cold air blowing. The compressor turns over the, their are no leaks but the system just blows warm. Went and bought a chilton just to make sure everything is hooked up correctly and also had a friend go thru it. everything checks out as good. Now confused as to what the problem is!

Also blew the heater core out a while back, it was a mess, plenty of radiator fluid all over the passenger side. Trying to find the easiest way to take the core out from under the dash to replace it. Any suggestions on how to take this out with out removing the entire dash (even though that might be the only way).

Any suggestions on these would be great. Dont tell me to take it to a mechanic, it isnt going to happen!