When the heater is on there is hot air on the drivers side and cold air on the passengers side Does anyone have any suggestions

Is this a dual zone system? Has someone been working on this? You need to check for codes and see whats going on! Follow the steps below once, record all codes, do not clear them yet!

l have two possible causes for this concern. The a/c system is undercharged ( l have seen this on several Caddies), or the right temperature door actuator is malfunctioning. l have not had to replace a control head or programmer for this problem. l am assuming ur Caddy is equipped w/ auto, dual-zone climate control system. l believe that is the only system offered for ur vehicle anyway. Percentage-wise, l believe replacing the right temperature door actuator is in the high 90 is of repairing the problem. Hope this helps.