CLIMATE CONTROL - ERRATIC OPERATION OF THE
COOL/WARM FUNCTION OF THE TEMPERATURE
CONTROL SYSTEM - REPAIR PROCEDURE FOR
STRATIFICATION (SECONDARY) TEMPERATURE
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
|1.||Remove the Instrument Panel. Refer to the appropriate model year Workshop Manual Section 501-12. |
|2.||Remove the Temperature Blend Door Actuator. Refer to Workshop Manual Section 412-04. |
|3.||The door control should now move freely. (depending on the extent of door interference, the door may not be able to be moved freely).|
|4.||Inside the plenum, you will see the Stratification (Secondary) Temperature Blend Door or upper door attached to the main temperature blend door by an internal white nylon link. Disconnect the nylon link from the stratification door. Squeezing the clips together on the white nylon link should aid in removal (Figure 1). |
|5.||Reach inside and remove the stratification door. Cutting the door with metal snip pliers near the pivots will provide easier removal. |
|6.||Place the new door 3F1Z-19D842-AA inside the plenum chamber and slide in the large pivot point first (which is closest to you) then slide the door into position until the small door pivot point on the front side of the case clicks into place. |
|7.||Connect the nylon link, reinstall the temperature blend door actuator, and instrument panel|