I think I may have a climate control problem, but I'm not sure.
I have my auto climate control set to 72 degrees.
On a cold day, the heater fan turns on high, hot air comes out of the vents and the car warms up.
As the interior temperature approaches 72, the heater fan slows down to low speed and the air temperature out of the vents turns from hot to luke warm.
As I keep driving for the day, the interior of the car keeps getting warmer, the interior temperature increases to 80 to 85 degrees while the climate control is still set to 72, there is still luke warm air coming out of the vents and the fan speed is still on low.
If I decrease the climate control setting to 70, then cool air will come out of the vents and the interior of the car will cool down.
It seems to me that the climate control system has the ability to heat, cool, change the fan speeds, knows where my desired temperature is, but it fails to hold that desired temperature.
I don't know if the outside temperature has any affect on the way the system works.
This is not a big issue. I just turn the system off if it gets to warm. But I'm just wondering, if this sounds like normal operation, or do I have a problem? Also, Is the heater fan supposed to turn off at the desired temperature or does is it supposed to keep running on low speed?