I'm not sure if my heater/ac controls are working properly. Because quite frankly, my heater sucks. I've cleaned out the heater box and flushed the heater coreand it didn't change a thing. When I push the "heat" button, hot (actually slightly warm) air only blows through the vents on either side of the transmission tunnel and he upper vents close.
When you push the "heat" button on, do your vents stay open and have hot air blow through them or do they close? And does your trucks heater blow hot air at all?
Thanks,
Mike