Don t touch the hvac controls.
Blend door calibration procedure.
Gmc yukon and chevy tahoe blend door calibration.
A trouble code may set if the components start to wear and the endpoints drift too far from the pre programmed positions.
It only applies to the temperature door actuator.
Basically you re pulling the fuse and turning the key on then reinstalling the fuse to.
If your vehicle has manual controls a recalibration is not possible or needed.
The service manual says to it needs to have the key in the run position for 3 minutes.
4 calibration should take about about 2 minutes to complete if you have heater control and about 20 seconds if you have automatic temp control system.
Or remove the hvac ecas fuse for a minimum of 10 seconds.
Most of these endpoints are calibrated during the relearn procedure.
Before you give up and take it to a dealership try this re calibration procedure from sparky s.
But i did that and nothing happened at all.
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A re calibration may fix you up.
Let them do whatever that want to do.
Okay the only recalibration procedure is for a system that has auto controls.
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Then turn the key to the on position but don t start.
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Heatertreater offers the ultimate solution to blend door repair.
Does a fuse need to pulled battery need to be disconnected or did i not wait long enough.
Once you sign in follow these instructions to access our repair guides.
If you happen to have auto controls the temperature door recalibration is performed as usual but the fuse will be labeled rdo batt.
Re install the hvac ecas fuse.
The blend door diverts the airflow to the defroster vents in the upper dashboard the floor discharge for heat or the center vents for air conditioning.
5 if lights continue to flash after 3 minutes manual system or 20 seconds auto system the control unit has detected a failure.
The hvac control head uses its pre programmed logic and actuator endpoints to position the door correctly.
Motor calibration procedure for jeep grand cherokee 99 04 heatertreater.
