cold air on auto when t-stat set warm
I have a 2000 528i with 140k not so cared for miles. I have an ac/heat issue. When car is warmed up I set dual thermostats at 72 degrees and if i have selector switch on floor and vent settings, all is good. Thermostat regulates heat output and keeps everything good. My problem starts when I switch selector switch to auto. I only get cold air out vents an floor duct closes but you can tell heat is trying to get out but it cant. As soon as I switch from auto setting to floor or vent setting warm air begins to flow out these vents. Any ideas?