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Often in cars there are a couple resistance wire coils in series with the slower fan speeds, and these resistance wire coils are usually in the air stream inside the air ducts in the dashboard. As they corrode(they are in the airstream) and age sometimes they overheat and burn out and stop the blower from lower speeds. Needs be found and replaced if "Open circuited" A wiring diagram from the manufacturer would reveal. If "blower resistance coils" asked for at autoparts store (used by garage auto repair guys) may have a parts lookup, assembly schematics may show where it is located in the vehicle.
In my estimation that means either a valve is not responding to the controls and opening the doors to the rear blower channels, or that the channels have become crushed or obstructed. Check what you can under the dash and perhaps use a vacuum to try and clear any obstructions there may be inside the ducts. Secondly you can listen to be sure the motors or vacuum valve controls are actually opening the ducts to air at all. Of course do this with the radio off and the key in the access position.
Crushed duct, restricted air flow in the return air duct. Failing blower motor dirt build up on scroll cage for blower motor. Could also have an open duct in your supply trunk line.
Try opening the glove box and looking in behind it for wires coming from blower motor and they will go to a connector that is attached to the blower motor resistor, usually mounted in the ducting with 2 small screws. That resistor needs to be replaced. You may have to empty glove box and flip it down to see it, or look up under and behind glove box.
Turn off power, if this is a complete outdoor unit, remove the blower door Turn Unit back on see if the blower motor is working. If belt driven belt is loose or off, if direct drive and the fan is not working, its possible the capacitor is bad or fan is bad.
If fan is operating, then either a damper is closed, something is obstructing the duct or it is at to low
of speed.
Check fuse supplying fan is not blown,
Check blower control switch is operating OK,
Check relay controlling fan is operating OK,
Check variable speed resistor pack is not faulty (the resistor pack is usually located in the blower ducting, in the blower airflow),
Check blower motor ground connection is not missing.
You need to have a look at your AC switch , dim and bright toggle switch and also the relay system on your fuse box and check for relays that might be heating up and the possibility of water ingress onto the fuse box which have been a vw problem for many years and if you dont find any problem there then start looking for electrical harnesses that may be chafed or broken and shorting out inside the harness but the fact that you can trigger it off points to a relay.
Please check for any blockage and in the ac duct, IF the duct is clean you need to refill the AC gas and get it serviced as the AC thens to weak over the years ........................
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