checking why there's no heating in the car, both of the hoses going to the heater valve are hot outside the cabine, but strangely just as they pass through the firewall they get as cold as stone. is it because of a blockage? i would expect that the feeding hose will be hot at least until it connects to the valve.
and how do you remove the ventilation panel? i opened the 4 torx screws on top but it won't move.