Laying in bed last night, i had an idea about improving my heater in my defender. One problem i've got is whenever i turn it on to demist the window, it does the opposite, and makes it much worse, i think this is due to water getting through the wing top grill and into the fan. So to solve this problem and try and impove the output, i thought about making an intake duct which points towards the turbo / exhaust so the fan pulls in warm dry air from under the bonnet.
Any comments / suggestions about this idea ?