The mirrors fold in but not to certain that its touching the window. The mirrors should defrost the same amount of time as the rear window or may be quicker as the mirrors are smaller. there could be chance of the mirrors not warmin properly. are these after market glass or orignal upgrade from dealers?
It will warm up certain extent, but sumthing that you be able to feel it much. Yeh the best time to check when its frosty. Heated mirrors dont exactly evaorate water. they jus heat it up so it does not frost up
you should see it working when its frosty,
is yours a cupra r? or standard cupra ?