Just to confirm the flow would be sufficient before finally plumping with the polo blower fan.
Here's the back face of the reworked bulkhead panel, the silicone pipe fits straight over the stock interface for the old fresh air blower motor. It was all given a good coat of epoxy mastic 121 as it will be very exposed to the elements...
All in and works very well! I fitted a short section of Rover 100 heater pipe as it has a neat moulded in bleed screw.
Under-bonnet parts all done now. I had to modify the windscreen.headlight washer tank to fit over the radiator cover. I will probably also make some finishing panels before carpeting this area.
A functional solution for how to fit the VW t25 heater switch to the dash. It has tiny features to try to make up some sort of retaining bracket and even those wouldn't clear properly, the rear end of it was also extremely close to the heater control cables so using some fibreglass filler was an acceptable solution for me. I was able to use the stock VW plug on the back of it and the wire colour coding matched the blower so all good... (the original switch was only a 2 speed which is why I changed it)
