Noise heater or defroster motor

Is the squealing coming from inside the car or under the hood? The A/C compressor runs when the defroster is on. If the belt is loose or worn, it will squeal. The blower is really the only moving part under the dash. If the noise is coming from there, you likely have a bad blower motor.

Could be the mode door actuator. I\'m not exactly sure where under the dash yours is, but if you can crawl under and see it, move the knob on the dash to different settings and see if it moves freely. If it sticks, or makes a clicking noise, replace it. If it does move freely, you may have a problem with one of the doors in the air distribution box.

is the noise coming from the inside under dash if so sounds like it could be the fan motor if from under the bonnet is possibly the air con compressor

that noise you are hearing is the blend door motor. A blend door motor switches from heat to a/c and what vent to blow it out of. it is located on the heater box under the dash

Do you hear a clicking noise when you turn your truck on? Its probably the actuator. While the defroster was on I removed the fuse locted under the rear driver side seat. I think its 36B. It stopped the clicking noise and my air vents work well now.

sounds like u have an electric mode door motor,in ur hvac housing stripped . move the mode selector to different positions to amplify noise an sort of control noise. u have a blend air door motor, mode position motor, for example inside air an outside air recirculating door motor, or defroster mode motor or actuate the heater position an u should b able to control noise by changing modes, thats wen u know u found it wen u can make the noise come an go. also one of ur selector positions is obviously not workin due to a stripped motor or broken blend door. good luck

sounds like tou have the blend air door motor bad located on the heater box under the dash

Just a suspicion: hissing noise comes from failed/jammed/malfunctioning motor to move the door
in the ducting to route heated air to the hoses/ports for "heater" and "defrost."
Problem: failure of motor/linkage to heater/defrost selector door under the dash on the passenger side.
Also sounds like you have not blown fuse to this selector door.
Also - hissing noise could be air being forced against the closed door (which should be open) - in this
case, you'd want to check the fuse to the heater/defroster actuator door.
The rear heater works since its function is not related to the operation of the front heater/defroster.

If this noise is a clicking sound and is coming from the front center of the dash, then it may be the blender door motor which will require removal of the dash to replace it. It will keep the door from switching from heat to a/c. Does the odor smell like you have a freon leak in your a/c evaporator core or does it smell like a rat stuck in your heater and a/c ducts?

Hi jrm the smoke under the wing is the fuel fired heater and is normal. the noise is the heater motors for the heater flaps, there is a jag fix but you have to replace all the motors just ignore it.  Try changeing the filter for the heater under the left side scuttle panel thats below the black plastic panel below the screen that will help the steaming up     D