How much space between gas tank and floor? Options

[914turboford]

How much space is there between the gas tank and the floor on a 914? Due to the high cost of fuel we are planning on bringing our 914 out of winter hibernation to lessen our dependance on my wife's Blazer. Since the car is liquid cooled I am thinking about using heated air coming from the radiator to heat the car. I want to put a duct running from the front trunk to the interior foot well passing under the fuel tank. Does anyone know how much room there is?

Brian Roth

[914turboford]

Yesterday I started doing some measuring and concluded that there is less than one inch of clearance between the sheet metal hump over the steering rack and the bottom of the tank. So, I abandoned the idea. Instead I used a heater core for a Ford something that I bought at a garage sale. I made a shroud for it and used a 914 blower fan to suck through it and blow through the stock driver's side heater channel. I connected the heater core through the inlet to the stock water to oil oil cooler on the 2.3 turbo. After getting it all installed I could not get the fan switch on the dash to activate the blower wires (if I found them: green and brown?). I must admit, after four 914's I still don't fully understand how to turn on and adjust the heater. However, I am pretty certain there is a problem in the fan switch circuit. I tried swapping around the round relays on the regulator plate and still nothing. If the fan signal goes through the relay how does the amperage change to run the fan at different speeds?