eBay 4 million reasons you'll find it here
    Turbo time! The electric fan motor near Tracy's knee is from a VW van. What, you actually thought we put a turbocharger on the motor? C'mon, do you mind if we at least get some heat going first? Sheesh!
OK so Tracy is drilling holes in the floor behind the rear seat to mount the new fan.
The idea is that we will actually have heat. No really, like with a switch & everything! We will also be reheating inside air instead
of heating outside air. This has the advantage not of creating hotter air but rather, filling the car with enough exhaust fumes so that after a while it just doesn't seem cold anymore.
    Tracy drills a 2-1/8" hole through the firewall for the "fresh air hose".
    I guess some background is due here for you poor souls that are unfortunate enough to have made it this far in life without ever experiencing the unique subtleties of the (supposed) heating system that came with the old air-cooled VW's. One has to wonder if this part of the car was designed at the beach in Bermuda during a vacation
from the long, cold German winter. I have an image in my mind of the engineer in charge of designing the "climate control" systems for VW. He is sitting there on the beach, one umbrella overhead, the other in his drink. All the problems in life have mostly melted away as the tropical sun bakes his pasty German skin. With a soft grin on his face he muses "It's not really dat colt in zi winter. People drife too much in zi winter anyway! Better to be spendink time near zi fire in der ski lodch zan pointlessly drivink about der countrysite!" Next to him is Helmut, the guy who did the door & windshield seals, "Stop worryink about it! We haf two days of holiday left. Hey, did I tell about how I fixed zi stupit door seal zat kept fallink out?..."

OK so here's how it works: There is a big pulley on the engine crank. It's the thing that is wobbling around like it's about to fall off while the engine is idling, from where someone bent it trying to pry it off the crank with a screwdriver. The crank pulley is connected to the alternator (or generator if it hasn't caught on fire like ours did!) by a fan belt . On the other end of the pulley shaft that runs through the alternator is a big fan inside of a box (fan shroud) that surrounds the engine. The fan blows air down through the engine and out the bottom of the box which is open. There are two holes in the side of that fan shroud with tubes that go to smaller boxes (heater boxes) that surround the exhaust pipes. So the fan blows some of the air through these tubes, over the exhaust pipes, through about 6 feet of tubing where the heat, uh-warmish air/exhaust fumes (strangely, VW calls this the "fresh air" system) blows no-"wafts" no-kind of "leaks" out the top of the dash and also the base of the rear window, and the floor vents if you've kicked them open with your toe.
    Of course the fan speed is wholly dependent on engine speed. This explains the guy in the purple bug next to you at the stop light with the fogging windows and the engine racing at 5,000 RPM. Now I'm not exaggerating here! If your sitting at the light and you put your hand over the dash vent the air sort of "tickles" about your fingers. Especially if you have the floor vents open to warm your tootsies. But if that's the case your just not thinking and it's your own fault!
    The winter driving routine goes something like this: You are 2 miles from the house and the every window in the car is solid fog. You've been revving the engine, cursing the heater, and wiping the windshield with the winter gloves you're wearing as you meander down the road. When it comes time to change lanes you put the blinker on, wait five seconds, then suddenly lurch to the side and straighten out again. This is a warning to the other drivers in your area. Now, with everyone around you on alert you s-l-o-w-l-y edge your way into the space that you just hope your scared neighbors have created for you in the next lane. With the air finally starting to warm up, you feel something on your left ankle. The floor vents are open from the last drive! No wonder the defrost isn't working! You kick the drivers side floor vent closed. Here's the good part. There's another one on the other side of the car. Now you're driving along with your left hand on the wheel, your right glove wiping the windshield clear, your left foot on the gas, and you scoot over toward the middle of the car. Raising your right leg to clear the shifter, (this is why VW didn't put a center console in) with those damn sharp little screws from the emergency brake digging into your butt, you start kicking the passenger side floor vent trying to get it to slide closed over 30 years of crud. Twenty minutes later the windows are clear and your feet are freezing so you open the floor vents back up, and everything is beautiful. Until the next trip...
    All this for what people living in an advanced civilization would call merely warm air.
    Tracy Goops the semi-rigid PVC tubing we used to go through the firewall. These will be replaced with welded in steel tubes when we strip the car for the full, body-off restoration (some time after retirement).