Digital climate control unit not working

2002 SAAB 9-3
150,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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GPANG
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My car listed above SE model digital climate control unit went bad. I purchased used unit and need help to reset. Now, no heat and blowing cold air at high speed.
Is the digital climate control problem? Or cabin sensor problem? or something else?

Thanks
Jan 7, 2020 at 8:33 AM
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STRAILER
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The new unit must be reprogrammed here is the instruction in the diagrams below to help you fix the issue.

Calibrate the ACC-system by simultaneously pressing the buttons "AUTO" and "OFF".

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Jan 8, 2020 at 11:04 AM
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GPANG
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Thank you for your response.
The unit will produce heat upon resetting by pressing auto and off button at the same time. The problem starts when I try to adjust the temp using the blue and red arrows. ,
It produces heat for about a few minutes and then cold air starts blowing.Even upon trying to set the temperature on high using the arrow the unit will not heat. Until I reset the unit from the beginning, I have no heat. What do you think I should do?

Greatly appreciative,

Gpang
Jan 9, 2020 at 11:15 AM
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STRAILER
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It could be the system is working correctly, but the heater side of things is not working. can you let the car warm up then turn the heater on high then open the hood and feel both heater hoses they should be hot to the touch? This guide can help us:


https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.
Jan 9, 2020 at 11:17 AM