Ford Transit

Hello everyone!! I have a question: I'm going to buy a Ford Transit 100cv Furgon 260 of the year 2003. When I went to prove it, I turned on the light of the heater.

Question: That light on that is only for that or is it for something else? He has had some days to change it and he has not done so and I have begun to doubt that it is something else.

If you know something .....