Originally Posted by mswlogo
I think the temp inside the vent being high might be a red herring and can be normally high in some situations without over heating the cabin.
The major issue is that 120+ °F is painfully hot. If this is normal then normal is wrong. You can see in jeepwes' video that his thermometer probe is *outside* the vent and still reading close to 130 °F.
Like you, I prefer to set the fan to blow manually. However, the schizophrenic output temperature happens on auto as well. The system seems to blow exceedingly hot or "cold" ("cold" may actually be the set thermostat value). Regardless of whether the cabin average temperature is "correct" or "within tolerance", the output temperature from the vents matters in terms of tolerability.
More simply, the average cabin temperature is far less important to perceived tolerability than the temperature from the vents. If the system were blowing a stable temperature then the desired temperature level could be achieved even if the system were miscalibrated. As it stands, there is no way to control the system's output (except by turning it off altogether).