Coolant Loss No Visible Leaks

My 2013 Renault Scenic with a gasoline engine is losing coolant, but I can't find any leaks. The check engine light is on with a coolant-related code. I've checked the hoses, water pump, and reservoir, but everything looks dry. Has anyone seen this before?

4 comment(s)

Coolant disappearing like that is never good. Have you checked the oil for a milky appearance? Also, what's the car's mileage?

Oil looks normal, thankfully. The car has 102436 km.

Okay, so no head gasket issues yet. Since you've checked the obvious external points, a system pressure test might be a good idea. At that mileage, a small leak can be hard to spot without the right equipment. A workshop visit might be in order.

Thanks for the advice! I took it to a local mechanic who pressure tested the system. It was a defective plug connection. They replaced it for 95€ and the check engine light is now off.

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