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Modus AC Undervoltage

I'm having a nightmare with the A/C in my 2011 Renault Modus (gasoline engine). Summer's here, and it's decided to give up. The air conditioning system doesn't switch on at all. When I press the A/C button, nothing happens; no cold air, and the compressor refuses to kick in. I've plugged it into a code reader, and it throws up an error related to undervoltage. The battery seems fine. Mileage is at 159435 km. I have checked the AC relay, but it seems okay. Could it be a refrigerant leak, or is my A/C compressor finally dead? Any ideas before I throw in the towel and take it to a garage?

The air conditioning system in a 2011 Renault Modus was not functioning, with an error indicating undervoltage at the A/C compressor. The battery appeared fine, and the A/C relay seemed okay, leading to uncertainty about whether the issue was a refrigerant leak or a failing compressor. Suggestions included checking the cabin air filter and manually testing the voltage at the compressor. Ultimately, a professional diagnosis revealed a failed relay switch due to the undervoltage issue, which was repaired, restoring the A/C functionality.

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4 comment(s)

I'm no expert, but I've heard similar things about Renault A/C systems. Have you checked the simple things like the cabin air filter? A blocked filter can sometimes cause weird issues. Also, is the error code specific, or just a general undervoltage warning? Knowing the exact code might help narrow things down. Have you tried to manually check the voltage on the AC compressor?

Good shout on the cabin filter; I'll give that a look. The error code is a generic 'Undervoltage at the A/C compressor' warning, so not super helpful. I haven't manually checked the voltage at the compressor myself – I'm a bit wary of messing with the electrics without knowing exactly what I'm doing. Is that something I can easily test with a multimeter, or am I better off leaving it to someone who knows their way around?

If it's throwing up undervoltage errors and you're not comfortable testing electrics, I'd seriously consider getting it checked out by a professional. Could be a dodgy relay, a wiring issue, or even the compressor itself failing. It's hard to diagnose these things without proper equipment and knowledge. You could damage something. Better to have a workshop check the whole A/C system.

Cheers for the advice; I appreciate it. I think you're right; best not to bodge it. Booked it in with a local garage; they reckon it was indeed the relay switch, which had failed due to the undervoltage issue (final repair cost: 240€). All sorted now, and the A/C is ice cold again. Thanks again for the help!

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RENAULT

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MODUS