The goofy thing about the Caddilac CUE radio is that the ON button has NO LABEL until it is turned on. So there is no way to turn it on other than hitting every random styled button or reading the manual.
You see that 1/0 button to the left of the volume at the lower left? It's only lit when the radio is turned on.
Now assuming it's turned on, can you figure out where the heater temperature and fan controls are? Normallly, you're looking for a dial, or maybe an up down arrow. The controls are there, but styled so they don't look like control butttons. The heater temp arrows are at the left and right "smile" corners, the fan speed are on either side of the off button, which is in the middle of the smile.