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Are you loosing radiator fluid. sometimes the heater core will rupture and you will smell burn odor. also check for strange rubbing sounds or screeching coming from the blower fan motor. or engine exhaust manifolds are hot when car is on, make sure nothing is leaning on them which will cause a burn odor. Any odor coming from outside will find it's way inside through the fresh air vents.
Double check Problem: Thermostat is different from blower Motor problem. I changed [ on passenger side interior ], the RESISTOR PACK for Fan speed then the Cockpit Fan which is behind the Glove Compartment. My Fan was emitting a burning smell then stopped completely. Used Haynes Manual for replacement instructions. Test OK
It appears your fan itself burned out. When a field coil of an electrical fan burns out it usually makes a lot of smoke. The noise could be something that fell in there that stopped the fan from turning freely. I can imagine it heated up under the strain and burned out.
When you restarted it was burnt out so hence no noise and no fan. The smell of the smoke should also be clue. Electrical field coils burning has an awful soury type of smell.
Check the fan on broken blades - even a small part missing can cause unusual sounds. If parts are new / serviced - smell can be due to labels getting hot and emitting slight burning smell. Classic are exhaust pipes with partnumber labels left on there. If he smell stays, something in the interior might come from a crash car which was partly burned.