The radiator fan in my Octavia (1.6 petrol from 2000) doesn't seem to start, and I was wondering if there is a fuse to check - can't seem to find it anywhere.

Maybe a coolant temperature sensor?

Try a search on it.

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I know mine's a diesel, but it just doesn't seem to heat, even when stuck in m/way traffic jams that spend an hour or so at anything between standstill and 15mph. So I'd suspect the separate temperature sensor mis-reading, rather than the fan not cutting in.

Had one on 1999 1.8 the other week. It was a corroded fuse, green 30Amp on top of the battery towards the drivers side.

The radiator fan fuses are on top of the battery. The radiator stage 1 fuse (30A) is the righthand one of the group of 3 small fuses on the left, and the radiator fan stage 2 fuse (40A) is the midddle one of the group of 5 on the right.