how to recalibrate a Auto HVAC module
08-26-2021, 08:13 PM
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how to recalibrate a Auto HVAC module
Need to know how to re-calibrate a GM auto HVAC module on my 2003 Cadillac Escolade EXT. Having problems with going from cool to hot. Figure I need to re-calibrate.
08-26-2021, 09:23 PM
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System relearn.
For non vacuum operated systems (electronic) the module needs to learn the full open and full close positions of the doors.
AC reset
Turn the system on full cold Max AC.
Radio OFF.
Turn ignition OFF.
Pull the HVAC (AC) fuse from interior fuse box. Leave out for 1 minute and replace.
Turn key to run/on position....NOT start.
Do not touch any controls. You'll hear the doors (actuators) being opened and closed. The HVAC module is learning the full open and full close positions. Wait until the system is completely done with the learning process. Less than a minute.
Start and test the system.
For non vacuum operated systems (electronic) the module needs to learn the full open and full close positions of the doors.
AC reset
Turn the system on full cold Max AC.
Radio OFF.
Turn ignition OFF.
Pull the HVAC (AC) fuse from interior fuse box. Leave out for 1 minute and replace.
Turn key to run/on position....NOT start.
Do not touch any controls. You'll hear the doors (actuators) being opened and closed. The HVAC module is learning the full open and full close positions. Wait until the system is completely done with the learning process. Less than a minute.
Start and test the system.
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CathedralCub (08-26-2021)
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