1970 LeMans

When you say heater , do you mean the blower fan ? Did you have the key in the ON position ? It comes in from the main harness to the fuse block . if it's the blower check the speed resister under the hood .

The fuse block is marked heater. The blower fan does not work. Yes key was in the on position. I'm unsure of what the "speed resister" looks like. I bought this car a couple of months ago and the guy I got it from said the the blower had just quit working. From the looks of some of the work he had attempted I can' t be sure of his truthfulness. He only had the car about a year and was going to restore it. I've just put new carpets in it and while the seat is still out I thought I would try to tackle any under dash problems. As I can't do that lay on the seat with my head below my feet anymore thing.

Your best bet is to trace the wire from the fuse block , there should be power there . also check where the wire attaches to the fuse holder on the back side .

I'm trying to find a schematic that shows the wire color since it is a pain to pull the fuse box out far enough to see the color. But as a last resort I guess that I'll have to pull it out.