Coolant reservoir tank

[Peggy207]

Good afternoon, yesterday when checking my oil I noticed that my coolant was slightly low so I toped it up to just below the full line,I drove to work this morning and checked it again but this time I noticed it was rather high nearly to the top, is this normal or do I have an air leak or worse a head gasket issue? Thank you.

[white exec]

Always check the coolant level when the engine is cold.
As it heats up, the level will rise - this is normal.
You need to compare like with like.

[xantia_v6]

Something I found on the 308 is that the radiator hoses have external mesh webbing around fairly soft hose, and if the external webbing splits, the hose bulges when the engine is hot, causing the apparent coolant level to drop significantly, but recover when the engine cools.