Having a problem with my 2005 TL. Climate control set to "Auto" and a
given temp, say, 70F, will only blow cool air even on a cold day well
below the setting, unless, after the engine warms up, I reset the temp
well over 80F and then it will suddenly supply heat and, when the
control is reset to 70F, it will then maintain it or any other temp
change I make the rest of the trip without a problem.
1. Anyone got any idea of what might cause this?
2. Does the 2005 Climate Control have a self test fucntion? If it
does, what are the commands to trigger the test?