After playing with it for sometime.... I still dont know how it works......

Usually switch it at auto climate control with circulate air on at 24 or want it to be colder 22 or 23, thats it.

I notice that sometimes the foot blower blow warm air, while the vents at the dash is cool air, so put to 23 or 22 then both also cold air.

Use the fan control (off auto), set at 24, no air at vents on dash, air at foot is warm, set to 23 or 22, no air at foot, but vents got cold air...

Never try with high tempreature yet....

Off air-cond, off the circulate air, got warm air come in. On the circulate air, no air come in. Never to try off the AC function yet.

Too many different variables to play with, but I suspect that the heater is at the foot blower area, thats why alwasy got hot air, either that or it is sucking hot air, but then I always use the circulate cabin air .