... Tow it to a shop...and not drive it to a shop... ?I'm not sure what the rumbling and then a sort of squeak at the engine shut off is. That's even with the AC (and fan) turned off before shutdown?
Was it a true full-evacuation and then recharge with the proper amount? It'd be nice for the shop to provide low and high side working pressures. I'd say let a shop look at it. That doesn't sound good.