Xantina Aircon Always On

[citroDane]

Hi guys,

The aircon on my Xantia MK2 has suddenly started to kick in on its own and won't turn off.
I noticed this first when I saw the green LED lamp on the AC on-off switch flicker at a high frequency
(half as brightly as usual). Checking under the hood, I can see the refrigerant flowing in the bottle, radiator
fans are on all the time (it's only 5 degrees C outside) although they bounce (fluctuating fan speed) and I hear the
aircon compressor relay clicking repeatedly.

Now the green lamp on the AC switch is constantly on (no flickering) though still half as brightly as usual. Pushing the switch in doesn't make any difference...the AC is on all the time, unless of course you turn off the blower fan, which kills the AC. But that is normal behaviour (no blower fan, no AC).

I'd appreciate any ideas to help diagnose this. Has anyone had this problem or anything similar? What do you reckon, sensor problems?

Cheers,
Gabriel

[myglaren]

Have you got the screen demist/defrost on?
The aircon always operates if that is selected.

[citroDane]

Have you got the screen demist/defrost on?
The aircon always operates if that is selected.

No, I'm not on demist. But I guess I can't rule out a faulty lever/selector? Dunno how to test that. Albeit, how would that explain the AC switch light going on? It was never coming on when the AC kicked in as a result of demist being selected.

[Xaccers]

Could just be that the switch is faulty.
Would be worth popping it out and checking the contacts, or getting a replacement from a scrap yard and swapping them over.

[citroDane]

Could just be that the switch is faulty.
Would be worth popping it out and checking the contacts, or getting a replacement from a scrap yard and swapping them over.

I suppose. That could explain the green lamp...though the strange thing is while it's continuously on at half brightness, it does go to full brightness when I push it in, which could indicate that it actually does toggle. In any event I'll take it out tomorrow and see if I can test it with a multimeter. Tnx.