Am going to do an experiment on my AC. Going to block off the heater core completely, so that no hot water passes into the HVAC system. Very simple procedure, simply install shut off valve inline in the heater hose going from water pump to the heater core. I found my AC not performing as It really should. 78 degrees in KC yesterday 101 inside the truck at the end of the day(wow black interior). 16 mile drive home 12 of it on interstate. 42-44 on the passenger side 50-54 on drivers side was as cold as I could get it. This must be a blend door/ controll valve issue.
Whether it's a design flaw or a malfunction, I really believe that hot air that comes from the heater core is getting into the HVAC system when we ( by the controls) are asking it not to.
View attachment 21747View attachment 21748View attachment 21749 Hell if I'm going to have my dash torn apart. These shut off valves are very common, every big rig I have driven had one. Every summer you shut them off to make your AC cold cold cold. I'll keep ya'll updated