The actual dash fan switches they used on these were problematic when faced with overheating, and sometimes just quit from tired contacts....they also have a tendency to burn out, but if you have low speed, chances are the contacts are just old and tired......it would be a good bet to remove the switch by removing the center dash panel (if you have a center panel....some don't.....if you don't, the center control bezel comes out with the switch and all.......not too bad a job........
If you have a center trim panel (I'm assuming your '74 is like the 72's) there are 2 threaded studs attached to the backside of it that go through the steel dash.....go in through the ashtray/radio area and remove the nuts, then remove the panel after unplugging the switches and controls.
It's a pain, but you can save a bundle if you do it yourself. You can probably find a new switch on Ebay, or if you're lucky, at an old Chrysler dealer.
:coffee2:
