C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

W204 AC light flashing

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Old Aug 14, 2023 | 04:32 AM
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W204 AC light flashing

Hello, I am hopeful that somebody on here has had a similar experience to myself and could shed some light on a possible fix.

2012 Cd220 wagon, AC not working, light flashes on AC button. Took car to an AC “specialist” who said he drew and held a vacuum on the system and as all was good, recharged with refrigerant and dye. I drove it away and AC was working good. I stopped and went back about an hour later, now not working, AC light flashing. Took it back to specialist who said he’d check with a UV light but that it was probably the condenser.

I left the car with them and upon collection he showed me the condenser, it had been destroyed removing it, so no way of knowing if this really had been leaking, although he did show me a dark area on the fins that was where the refrigerant had been leaking. Anyway, he’d fitted a new condenser and said there were no other leaks. I tried the AC and not working, light flashing. Perplexed he put more gas in and it worked. I drove it home, ice cold during the hour long trip, left it for an hour or so, went out to test it, AC light flashing.

It’s going back to the specialist this morning so I’m hoping for any ideas from members here that I might be able to assist him. For example, could a faulty pressure switch give me these symptoms? Can you measure the system pressure if the compressor is not running?

Any help gratefully accepted.

thanks Chris
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Old Jan 10, 2026 | 01:01 AM
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Hello Sir, were you able to find the culprit for this problem?
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Old Jan 10, 2026 | 09:14 PM
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Originally Posted by 888gmi
Hello Sir, were you able to find the culprit for this problem?
Can you use your scanner tead AAC module faults?
Likely a bad pressure sensor.
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