matthiasmeyer1
Coolant Vanishing Act CLA Trouble
Summary of the thread
A 2014 Mercedes CLA owner experienced a coolant issue with the check engine light indicating low coolant levels, despite no visible leaks or milky oil. The problem was suspected to be either a defective cable or plug connection or a head gasket issue. After taking the car to a shop, it was discovered that the issue was a faulty coolant level sensor connector due to corrosion, which was cleaned and replaced, resolving the problem.
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4 comment(s)
matthiasmeyer1 (community.author)
Pressure test? I haven't done that yet. The cooling fan seems to work, but I'll keep an eye on it. A hairline crack? Where should I be looking? Is that common?
thomaspeters89
The hairline crack on the Volvo was hard to find. It was on one of the hoses, buried down low. Since the Mercedes is flagging a potential electrical issue, it might be worth checking those connections before tearing into the cooling system. Otherwise, I'd take it to the shop for a proper pressure test. It'll save you trouble.
matthiasmeyer1 (community.author)
I took it to the shop. It WAS a faulty coolant level sensor connector. Corrosion had gotten in there. They cleaned it, replaced the connector, and the code is gone. You were right! Diagnostic and repair cost 95€.
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MERCEDES
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CLA
thomaspeters89
Coolant issues are a pain. I had a similar problem with my old Volvo V70. I was losing coolant with no visible leaks and the check engine light was on. Did you pressure test the cooling system? It could be a hairline crack somewhere that only opens up under pressure. Is your cooling fan running normally?