Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.
The HVAC mode selections on these are controlled by an electric stepper
motor that receives commands from the BCM (body control module). The
BCM decides where the air door should be by looking at where the dash
control input is.
Each mode selected has a different resistance level. From low
resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost,
with Defrost as the highest resistance (~100K ohms). A high resistance
or open circuit would probably default the system to defrost no matter
what position the mode control was set to.
If the control is dirty or there is a connection issue, this could
cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The
system can be reset and recalibrated with a battery disconnect, this
will also erase any fault codes.
I would start by looking at the dash mode control.
Good luck, i hope this helps.
Jun 28, 2011 |
2006 Chrysler PT Cruiser