RiderJules
Electrical faults and air conditioning system message error in Mercedes S Class 2009
(Translated from German)
Summary of the thread
A 2009 Mercedes S Class is experiencing strange electrical faults and a flashing warning light on the speedometer, suspected to be linked to an air conditioning system error. A similar issue in a 2007 Mercedes E-Class was resolved by replacing a defective cold shut-off valve. It is suggested to check the air conditioning system's functionality and read the fault memory to identify the cause.
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4 comment(s)
RiderJules (community.author)
Hi, thanks for your reply! My car has 71396 kilometers on the clock so far and the last service was a few months ago. There is no special equipment or modifications, everything is standard. I'll consider your idea with the cold shut-off valve. Glad to hear you didn't have to pay for it, hopefully I'll have the same luck! Thanks again, really helpful!
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LindaFahrer
Hey, sure, you're welcome! With just over 70,0000 kilometers, your Benz only has half its life ahead of it if you treat it well! Your last service was only a few months ago, so that's good to know. So there shouldn't be a fundamental problem. However, if you see the same warning light as I did back then, it could actually be the cold shut-off valve. See if there are any signs that the air conditioning isn't working properly. Another tip: try reading out the fault memory or having it read. This may help you to find the cause. Good luck with this and keep us up to date!
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RiderJules (community.author)
Many thanks for the detailed reply and the advice! I will definitely check whether the air conditioning is working properly and probably also have the fault memory read out. I'll keep the refrigeration shut-off valve in mind, maybe that really is the cause. I'll get back to you when I know more or when the problem has been solved. Thanks again, I really appreciate your help!
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MERCEDES
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SKLASSE
LindaFahrer
Hey, I had a similar problem with my 2007 Mercedes E-Class. I would describe myself as someone with little car experience, but I think I can help you here. In my case, the cold shut-off valve was defective. I had it done myself in the garage and now everything is running smoothly again. The best thing about it: I didn't have to pay a penny for the repair. But to be able to help you more precisely, I would need more information about your vehicle. Is it a specific model or are there any other special features you should know about?
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