Peugeot 406 AC undervoltage issue

Hi, I'm having a weird issue with the A/C in my 2002 Peugeot 406 (gasoline engine). The air conditioning system doesn't switch on at all, and it's not cooling. I scanned for errors and found one stored in the memory, but nothing specific. I checked the pressure switch and AC relay, but they seem fine. Could undervoltage be the culprit?

4 comment(s)

Hey, that sounds familiar! I had a similar problem with my old Citroen years ago. Undervoltage is definitely a possibility. Have you checked the relay switch? Sometimes they can be faulty even if they appear okay visually. Did you check the fuse?

Thanks for the quick reply! I did check the relay visually, but not with a multimeter. Good point! Regarding the fuse, yes, that was the first thing I checked, and it seems fine. Is there a specific way to test the relay switch besides just looking at it?

Yeah, a multimeter is the way to go. But honestly, if you've checked the obvious stuff like the fuse and the relay seems okay, and you're getting undervoltage errors, it might be worth getting it checked by a professional. Could save you a lot of headache. I bet they can figure this out quickly!

Thanks for the advice! I took it to a workshop, and you were right; it was indeed due to undervoltage. They fixed some wiring issues, and the A/C is working perfectly now. The repair cost me 240€ Appreciate the help!

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