Well, it's Florida in the summer so the engine temp does rise a *little* in stop and go, but it never goes past halfway on the gauge. How do I pinch off the heater hoses? AC systems are something I'm very unfamiliar with.

Dont remember if it was an option then but does it have dual zone temp controls.?


my money is on its either a freon level issue or a blend air door problem in the box

if you have added small amounts of freon to test this, has said amounts been evacuated back out ?
If not, evac it completely and recharge the correct amount . Then start from scratch. Ck where your pressures are .
Disconnect cooling fan ( or place a piece of cardboard over the condenser and see if high side pressures rise( DO NOT let it max out)