Yeah.

Check coolant level, t'was low, so i bought some coolant and topped it up.

Why would it go low? I know for a fact it ain't leaking.

When was the last time it was changed? And have you noticed a gradual drop in coolant level or a sudden drop lately?

Chris

sometimes you get little places inside the engine where the coolant stays in little puddles and therefore doesn't drain back down into the expansion tank... want happens when you check the level with the engine idling??

How do you know it isnt leaking? Have you taken it up on a ramp and had a look etc?

Rad fan switches arent allways obvious.