Just picked up a 50 Plymouth Special Deluxe 2 door coupe. Drove it on a 450 mile round trip with no issues. BUT, today I was driving and suddenly I heard a new and troubling sound. It was a sound that is similar to a heater fan running a high speed. The car ran ok, shifted ok but the sound was still there. I eliminated the heater fan as a cause but the sound persisted. The noise remains with the clutch in or out in neutral. Once back to the house, I shut it off and checked the fan belt,,, it was fine. I started it up again and drove around the block. The sound had gone away at first, then with a little acceleration, it returned. The noise is not there when revving the engine while parked but it is there when driving. Again, it sounds like a high speed fan that you hear above the normal engine sound.
So,,,,, what could it be? It sounds like it's about the same RPM as the engine. Could it be a clutch noise? Through out bearing? I'll test drive it again tomorrow, not getting far from the house, and will get more of a description and more trouble shooting with clutch in, out, in neutral, driving in 1st, 2nd and 3rd,,, etc,,,.. Any idea's or thoughts?