Dual climate control. Heater blows hot on passanger side and always cold on driver side (seems more ambient cold than AC Cold). AC blows super cold on both sides. The main temp control on the dash sometimes gets stuck on auto when the car first starts up for a few minutes, then can be changed between different modes after a couple of minutes after starting. This is my Mom’s car, so I am not sure if this is normal.
A local shop diagnosed problem as a faulty temperature control module. I installed a used temp control module from a junk yard and nothing changed. This the module behind the dash, not the physical controls in the cab.
Does anyone have any suggestions as to what the problem could be here? Any input would be much appreciated.
Thanks,
Justin