Fan cuts out when on for a while

Hey all,

I think I know where to look, but it's going to be a PITA to do so.

Here's the symptom:

When I run the AC in my 66 T&C, it goes fine for a while, then all of a sudden, the blower stops. It might start again, then stops, start again, stop... and then it's done until the car cools down for a significant period of time. No electrical smell, no bad sound of labouring blower motor, nothing, it just stops. It also doesn't matter what speed I have the blower set to, so it's a main...

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