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AC Temperature no range. Only cold or hot

5 posts in this topic

Posted · Report post

HI guys,
I have a 2004 350Z softtop and have had issues with AC unit since I got it. 
The AC unit has 2 options - Cold (when set at 18 on the dial) and Hot when set to anything but 18. Makes no difference is AC button is on or off. There is no range. I have read it can be because of the sun sensor on the dash (no idea how that could be of any effect). I replaced the passenger side one but makes no difference - no surprise there. I have pulled the white AC control box out from under the stereo but everything looks fine. No broken cables, all lights and functions of the unit work - just the ability to adjust them temperature is stuffed. Anyone come across this issue before and been able to find a solution? Really annoying having either a hot or cold cabin and nothing in between!

Thanks!

Tim

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Posted · Report post

I have the same issue, it's supposedly a fault within the control box. I haven't bothered fixing it but it is annoying.

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Posted · Report post

Thanks for the reply Rob, Hoping I can find someone who has opened up these control boxes but doesn't seem like its that common of a problem. Shall keep hunting before take into a specialist.
Got this reply else where: Not sure if it is right but will look into and write back on here with results.
I really hope its the control box and not the following!

If you're not getting an inbetween range, it could have something to do with the blower box vent valve. That vent valve opens and closes redirecting airflow between recirculate and outside air. If you're getting steady hot or cold when set to both extremes (max cold and max hot) then it sounds like both, your AC Evap core and Heater core are functioning as intended. This is where I would look next. Maybe the servo arm stopped working or broke somehow? It's fairly easy to access the blower motor housing. But before dropping it, I would suggest pulling up the battery cowling under the hood. From there you can visually inspect the vent flap/valve from the outside air inlet port. Make sure it's opening and closing in accordance with your AC controls. I'm not an expert with the Z's AC system beyond this. There could be other components behind the dash that work to together with the blower box to help manage temperature. I believe there are other vent valves/doors that redirect airflow. For example the front window defrost and foot well vent settings.

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Posted · Report post

Not a bad way to start Rob. Might hunt around some wreckers and see what I can find. Will keep you posted. The thought of having a nice 22 degrees coming out my vents...  A man can dream..

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