My climate control has been blowing hot air most of the time independent of the temperature settings for the past few years. Turning on the A/C though does result in cold air coming out of the vents.
After reviewing this thread I have
- opened up the duovalve -- looks fine to me. (BTW those 5 screws require a Torx T9)
- checked the continuity of the two coils with a Fluke DMM -- both are 21.3V
- measured the voltage coming from the duovalve harness
Max heat: 12.8 V
Max cool: 13.8 V
My next step is to remove the A'/C heater control unit and apply the glue hack to the boards.
All that said, I welcome advice. Thanks