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Once in a while I get to work on my toy, MR T, my 1937 FIAT Topolino. This side view shows the small size of the wee coupe when compared to....
MR Z, our 2012 Honda CRZ Hybrid Coupe. I had installed the heater box [from a 1980 FIAT 124 Spider] but had not installed the control cables or the defroster ducts. So...
I finally convinced myself to press on with that work. Above, you can see the [more or less] rectangular frame for the main switch/relay/fuse panel. Behind that frame are the new defroster ducts. Below the frame is the heater control box.
This photo shows [top left] the end of the heater control box. You can see two of the three control cables coming out of it and two relays [for the left and right semaphores] at the end of the box. The black box to the right is the FIAT heater box.
Here is a straight on view of the heater control box. The defrost ducts [above] are easy to see. Just visible is one of the flasher relays [lower left] and the two semaphore relays [lower right--black].
This car is very small inside and I built it so it all can be UN-bolted. I completely re-wired the car and used plug-in connectors throughout. You can see three of them in this photo. Building a car essentially from scratch is a LOT of work, but it's also a lot of fun. I've enjoyed working on MR T for years. Hell, I might even live long enough to get it finished---HA!
These three critters are parts to make demisting/defrosting possible in MR T, my '37 FIAT "EuroRod". Top pair are the air outlet nozzles at the base of the windshield. Bottom is the fitting that slips into the stock Fiat 124 Spider heater box.
This is the heater box, mounted inside the cabin. At the extreme top is the defrost air fixture, fitted into the heater box.
This photo, taken from outside the car looking down through the [not yet installed] windshield, shows the two defroster delivery nozzles bolted in, at the base of the windshield. The orange knobs cover the windshield wiper arm actuators. The wiper motor and linkage are stock Fiat 124 Spider, narrowed slightly.
The drawing shows the whole heater/defroster system. Outside air comes into the system when the cowl door on the right side of the car is opened [extreme lower right]. Just inboard is a second door, which lets an adjustable amount of fresh air in on the passenger's legs. If the outside door is closed, this door [when open] lets air inside the cabin to recirculate through the heater.
Air is directed to the top of the stock heater box, where it passes over the heater core and either out the bottom, into the cabin, or up to the defroster tubes, or both, depending upon the position of the slide controls on the front of the heater control panel.
A bit of fabrication was required, but that's part of the fun. I was determined to have an effective heater/defroster system in this little mouse, so there it is.
