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sounds like blower motor fan for heat, the motor itself can be going bad or something is hitting fan blade inside heater box, I have seen all different things in heater boxes including acorns , leaves and general debris causing noises when fan for heater runs, you need to take it apart and check for anything that might be hitting fan if not motor is going bad and needs replacement, good luck.
you will need to replace the blower motor as it has probably siezed going by the squealing noise you say you heard.i`m assuming this has more than 3 speeds for the fan motor.if it wasn`t working on one speed then you probably have a bad blower motor resistor that will need to be replaced as well so you will have all fan speeds.this is located in the air duct housing near the blower motor and will have about 6 wires on it.some of these on under the hood on the firewall anywhere from the passenger side to the center of the firewall.not sure about the vent switch.if the vent switch is moving the doors and you hear a clicking then you may have a vent door problem that the door pivot is worn.
sounds like a mouse attack to me. mice get into the heater vents and blower motor cage and make nests. those can throw your blower motor out of balance, thus resulting in the noise and then the motor just gets jammed and stops operation. but it could be just the blower motor failure it self. have it checked.
Not the core making noise it is most likely the blower motor or the fan cage attached to the blower motor... most blowers are attached under the dash on pass. side or under the hood at the pass. side firewall area attached by approx. 5/6 #8 metric small bolts opr 1/4 inche or the like, it has a small black vent hose attached to it that also needs to simply be pulled off ...this will give you an idea where the blower is, the fan cage once you pull out the blower and disconnect the electrical plug and ground wire is mounted on the blower motors shaft with a #10 or a 3/8 inch or the like nut retaining it on the shaft.
You need to lubricate the 2 bearings on the motor. Takes about 30-50 min to take the area under the hood apart to get to it. It is in the housing underneath the Wiper assembly. Go to benzworld.org or peachparts.com for possibly pictures on how to do that.