lenawilson6
Mercedes A Klasse Diesel AC Problem
Summary of the thread
A 2016 Mercedes A Klasse diesel experienced an air conditioning failure, where the system stopped cooling and wouldn't switch on. Initial checks ruled out fuses and the blower motor, leading to suspicions of individual valves, a refrigerant leak, or an AC relay issue. Suggestions included checking the pressure sensor and compressor clutch for engagement, as these could indicate low refrigerant or electrical issues. Ultimately, the problem was diagnosed as a faulty valve and a small refrigerant leak, which was resolved by a garage, restoring the AC functionality.
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4 comment(s)
lenawilson6 (community.author)
Interesting! A faulty pressure sensor is not something I had considered. Where is the pressure sensor typically located? And how would I check the compressor clutch? I haven't got any fancy AC diagnostics tools, just basic stuff really. I am trying to keep costs down.
bernd_friedrich1
Okay, so on my Corsa, the pressure sensor was located near the condenser, at the front of the car. You might need to remove a plastic cover to see it. As for the compressor clutch, with the engine running and the AC switched on, have a look at the front of the compressor. The clutch is the part that engages and starts the compressor spinning. If it's not engaging, it could be a sign of low refrigerant, a faulty clutch, or a problem with the electrical supply to the clutch. Honestly, without the right tools, it's a bit tricky to diagnose properly. Maybe best to get a mechanic to take a look!
lenawilson6 (community.author)
Thanks for the input, I really appreciate it. I think you're right, I'm fighting a losing battle without proper diagnostic tools. I took it to a local garage. Turns out it was a faulty valve as I suspected and a small refrigerant leak. Cost me 1050€ in the end, but at least it's sorted now and the AC is blowing ice cold again!
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MERCEDES
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AKLASSE
bernd_friedrich1
That sounds rough! I had a similar issue with my old Vauxhall Corsa. The AC stopped working completely, and like you, I checked all the basic stuff first. It ended up being a faulty pressure sensor that was stopping the compressor from kicking in. Have you checked that? Also, is the compressor clutch engaging when you turn on the AC? You should be able to hear a click.