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so checked all fuses yet
then scan the OBD2 port for tons of HVAC errors called DTDs yet>?
car has huge list of TSB but not on HVAC
cabin air filter full dirty and packed up
ambient temp sensor bad or just dirty ,clean it
bad resistor block seen below. (if climate control?,the parts are not the same here)
or other parts bad, so scan the PCM OBD2 port.
Sound like the blend door behind the glove box is stuck. My problem that it was stuck in the closed position so I was not getting any heat. I had to take it to the repair shop and they took off the dash to get to it. It was expensive.
I am guessing it has eatc. The blower speed controller is shorted causing the blower to stay on all the time. Replace the controller and you should be good to go. It is located under the hood on the evaperator case. Good luck.
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.
1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.
2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.
3. Connect the blower to a 12v power source and see if it runs at high speed.
If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.
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