heater on my 73 works great. have both high and low speeds and heat and defrost.
problem is that the fan always runs. the "off" position doesn't actually turn the fan all the way off.
i'm assuming this isn't normal? presumably i'd need a new switch? just checking before i dig into the control unit. the guy i bought it from said it's always been that way and was assuming the fan just stayed on all the time in these trucks.
Sadly, photos of it are long gone. That aside, I solved the problem of a dead switch by enlarging the rectangular hole and installing a three position rocker (12 volt 3 position rocker - center was off, up high and down low.
When done, I had a rocker that lighted when power was applied to the fan (low or high). In the up position, it went to high. In the down position, it went to low. The middle position, the fan and light was off. Genuinely off.
Because the frame is pot metal, filing the shape to accommodate the swap to a non-stock, easily swapped switch, went, relatively, fast.
I got rid of ribs sticking up on both sides of where the original switch came through, then enlarged the hole to center the switch, after I knew it would mount flush.
Getting rid of the constant on mode added decades to the life of the switch.
It looks like I'll be doing the very same thing with my current rig. The fan won't come on, and a switch is one of the first places an old electronics hack would look (it did all the initial heater work for the last 47 years).
