Haha I'm well aware, I don't use it for that for just those reasons. I DO use it for warming the car up on cooler mornings though while it's idling in the driveway. Thanks for the reminder though!

ezzzzzzz, its not quite correct to say that the factory built cars with different parts installed, if I understand you correctly. The factory introduced running changes, which I believe is the right term, throughout the first year and a half of production. But it was a straight forward process. Once the early parts were used up, the newer parts were all you would see. Like you mentioned with the horizontal defroster wires, someone most likely swapped the early hatch for a late hatch to get his defroster wires working again. There may be some mixup of new and old parts within a narrow prodution range but the early hatches were probably used up on the production line sometime in january 1971. But you are right about having all the hardware for the fast idle without it actually being installed. If your car has an early serial number then it is one of the transition cars, at least for this feature. They simply ran out out of the parts to complete the installation!