I took the 300D to the a/c shop today and had it evacuated and a new dryer installed then oil and DuraCool 12a with 35 psi on the low side at 1500 rpm put in. Unfortunately, they must have shorted something because the PBU quit working in the vent and a/c setting. Should have a new PBU in tomorrow this time. I was able to run the "split level" setting and I liked what was coming out of the bottom vents and defroast strip. Good cold air. I will keep ya'll posted.
If I ever blow up I will ask the wife to come back to this post and give ya'll my regards
because I was cool to the end