QuestionON the air cond. control lcd screen, a book appears on the bottom right hand corner with an exclamation mark next to it . This only happens from time to time, not every time. What does this mean? Thanks for your time.
AnswerIt signs there is some own-sensed fault in the system. It oftenly the heater matrix temp. sensor, inner/outer temp. sensor, or either servo of the flaps.
You should go in the service and read the fault code from the HEVAC system. Thre will many faults I think, but not all of them are prmanent. Try to see in real-time display the actual sensor values, are they plausible?
Try to force the servos, and check the feedback%.
