[dogsdangles]

Hi all,


My 2002 9-3 ACC isn't providing me any intermediate temperatures. I get either super hot when I bring the ACC up to "HI," or I get cold air blowing on me for any temperature setting below "HI." I've run the ACC calibration a handful of times with no change. I'm not getting any codes, either.



Any thoughts? Interior air temp sensor? Heater control valve? What other troubleshooting steps can I take?


Thanks!

 

[EdT]

What is the outside temperature shown on SID? If it's incorrect, then that could cause issues.

Otherwise, my guess is that the temp sensor is reporting that the cabin is very hot, in which case the only way to force heat is to go HI and at all other temps it's thinking "boy, too hot, must cool".

A Tech II would show you what the ACC is thinking.

A failure of the blend door motor/linkage (a problem in 9-5s) is possible I guess, but I'm not sure what failure would leave the blend door able only to travel to either extreme.

 

[dogsdangles]

The outside temp on the SID appears to be correct (but that's a good troubleshooting suggestion; I hadn't thought of considering that). I don't own a Tech II, unfortunately. I'm trying to avoid bringing it to a "Tech II owner"

I'll try swapping the cabin temp sensor out (that's the one you're referring to, yes? the one in the center console by the OnStar buttons?).

Thanks for the suggestions.