this might be because the fluid is low if there is a leak
washer bottle might turn out to just be a fuse, or the pump motor burnt out, or the washer bottle empty. The washer bottle and pump are both near your right headlight (as if you were sat in the car, left headlight if you're facing it), not sure where the fuses are but I think they're inside the car under your steering wheel
the location of the heater matrix is if you look into your passenger glovebox... you will see a box at the back which is your cabin airfilter, there is a weird cable shaped like an elongated + sign, one end of that goes to the slider that puts your air on recirculate or fresh the other end of that goes up to a blower which looks like the drum of a washing machine sort of, your heater matrix is above/behind that