HI JUST FITTED A NEW CLIMATE CONTROL UNIT AND STILL HAVE SAME ORIGINAL FAULT, WHEN TEMP SET AT COOLEST 16 DEGREES MIDDLE DRIVERS FACE VENT BLOWS HOT, AND WHEN SET ON FACE AND FOOTWELL , FOOTWELL BLOWS HOT INSTESD OF COOL PLEASE HELP .REGARDS DEAN, :(
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Dynamic Stability Control....a derivitave of ABS / Traction control. The control unit that monitors the dynamics will most likely be sensing a difference in the measured wheel speeds. Possibly defective ABS sensor, wiring, ABS exciter ring, ABS module or steering angle sensor. Can also be triggered by wheel spin. Have a diagnostic scan done ( cost £30 - £50 approx at good local garage) to read the fault codes first. If you get a fault code relating to "ABS module pressure sensor" the module requires replacement (common issue). Used to be a £1400 job, but repair kit now available from dealer for £180 ish and 2 hours to fit.
Make sure you have fully charged AC sytem first, if so Im sorry to tell you this but this is a difficult deal.you may not be able to correct this without taking it to a repair shop with gm scan tool. Reason being the actuators for the hvac that most likely are malfunctioning from either them or another component being bad , require recalibration.The other reason would be the body control module related.It would have to be scanned for U codes which can effect the hvac control.Sorry but thats what I know.
There is a fix for this on the web. You have to remove the control unit and replace a resistor or capacitor. I did mine and it worked like a charm. Takes a coupla hours. the resistor is less than a dollar.