hot air without turning the heating on

[kwaterwindlife]

Hello all,

I am a fairly new driver and just bought my Citroen Saxo (petrol 1.1L) two months ago. I haven't got much experience yet so I am sorry if I asked some dumb questions here :/

I drove around Bedford and Cambridge yesterday, I felt the car was warmer than before even without heating on. I checked the engine temperature gauge and it pointed around the middle or slightly below while I was driving. I checked the engine coolant level just now, and could see it was around the neck. (I still can't locate the min/max markers) So I guess the level was fine? I just want to know if I need to be worried about this hot air situation in the car?

Thank you!
Chiying