Some vehicles may exhibit constant warm air discharge from the climate control system. This may be caused by the Climate Control Stratification Door (Secondary Temperature Blend Door) which may distort and bind.
Replace the Climate Control Stratification (Secondary) Temperature Blend Door with a redesigned service part. The service procedure has changed as this door is now available separately versus replacing the case assembly.
EATC System - EATC diagnostics may show a code B1249 or codes 022, 024 or 025. System defaults to full heat. System operates normally after running EATC on-demand self test, no concern found after performing appropriate Work Shop Manual Pin Point Test. Concern may repeat after two or more weeks.
Manual System - System has no temp control, possibly "popping" noise when changing temperature setting.
Stratification (Secondary) Temperature Blend Door Replacement
You can perform a self test of the system. Here is the details. Let me know what you get.
To enter the self-test, press the OFF and floor buttons simultaneously and then press the AUTO button within two seconds . The display will show a dashed line in the center of the climate control display window of the integrated Control Panel (ICP) .
The test may run as long as 30 seconds . Record all DTCs displayed. The self-test is completed when 888 appears in the center of the climate control display window of the ICP.