C1 Coolant Loss

Sounds like a coolant leak. Check around the engine, hoses, and radiator for visible leaks. Any white smoke from the exhaust? That could be a head gasket. Is your cooling fan running normally?

Thanks! No visible leaks or exhaust issues. The cooling fan seems to run more than usual. Where should I look for leaks? Any C1-specific hose or connection failure points?

The fan running more points to a coolant issue. Check the coolant reservoir for cracks, especially at the bottom. Inspect the water pump area closely. If unsure, a workshop pressure test will pinpoint it. I had a tiny hose crack found that way.

Thanks! The workshop found a small leak in a hose near the engine block. They replaced it, refilled the coolant, and did a pressure test. Total cost: 52€.