They are probably unrelated. Have the heater control checked, maybe the lower settings have disappeared due to a faulty control knob/button/slider etc.
The radio may not display due to a blown fuse somewhere, or a problem in the loom.
I would approach them as having discrete causes.An ICE technician can probably sort the radio out in minutes for a few dollars/euros/pounds
The heater control is probably a little more costly to remedy but should not be very much more.
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