Why does my heater on my 1989 Cadillac blow cold air when the temperature

Suni B

New Member
drops below 13 degrees F? For some reason the heater blows cold air, but only if the ambient temperature dips below 13 degrees. As soon as it gets just above that it works fine again...HELP!!! It's cold in Wyoming!!
 

p3200tmz

Rookie
Your car most likely has electronic HVAC controls (you have electronic buttons, not manual sliders, right?), and the ultra cold weather you are experiencing are causing the 19 year old electronics problems. Try swaping out the controller (the box in the dashboard with the buttons on the front) for another one from a junk yard or ebay.
 
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