I just replaced the climate control unit last night. The old one was just not working right, but when I had it on auto and ~22C, it worked OK'ish. Defrost was sketchy and the other fan control buttons were really bad. The economy button did not work, etc. So, I replaced it.

The new one behaves OK, as far as the air flow is concerned, but it seems to oscillate wildly between AC and the heater. It was ~75 last night (7 PM'ish) and when I took it for a test drive, the AC came on as expected and then the air flow switched to the defrost vents and the heat came on. Hot air started blowing, and then the AC came on again. This repeated several time. The good news is that the AC really works well and the various vent vacuum actuators are working as well (I was worried about these). With the old unit, I was not sure.

Other things that I have changed in the last year are the following: mono-valve (torn membrane), aspirator motor (sounded like a dying animal) and the blower motor (sounded like a dying animal).

Did a get a bad unit or is there something else likely broken that was masked by my bad climate control unit.

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Julio Garcia
1987 300 SDL (mine)
2006 Jeep Liberty CRD (mine/kids)
2008 Hyundai Sonata (wife)
2000 Saturn SL AKA "Gocart" (everyone)