I just replaced the LH blower motor in mine about 3 months ago. It started working intermittently, and making a growling like sound. I guessed the bearings were starting to go. The replacement motors are kinda pricey too. I lucked up and passed a scrap yard, when they were unloading a P38 with a wrecked front end, and you know I jumped on it. After handing over $75 the motor was mine. I will go ahead and warn you,...IT IS A PAIN IN THE @SS to replace it. You might be able to trouble shoot the wiring from under the dash at the motor, but if you're that far into it, just go a lil further and replace the blower.
I can give ya tips on how to do it if need be.
I can give ya tips on how to do it if need be.