In reply to # 1486031 by Fictioneer Illinois gets pretty cold in the winter. I suspect you must be building a fair weather car, Scott.
I guess that depends on what you mean by "fair weather." Last week I went out at 6am and it was 48F. In deference to the cooler weather I added a windbreaker to my usual wardrobe of shorts and sandals. Within 10 minutes or so my feet and legs were plenty toasty. I imagine that I will not be driving my Spit in weather below 40F, much the same as I used to with my motorcycle, which I sold to buy this. Although I still have my leathers should I have an uncontrollable urge to go motoring in January.
The main reasons I deleted the heater were:
1. The core was shot when I bought the car and the PO had already bypassed the heater control valve, and
2. I did not want to spend the money on a heater for a car that will not likely be driven much in winter, if at all, and
3. In light of #2 I am uncomfortable spending money to make the interior nice only to await the fall of the Sword of Damocles in the form a coolant leak from the heater core.