Blower Fan and Defrost Function Issues
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8th Gear
Joined: Dec 2024
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Blower Fan and Defrost Function Issues
Hi guys, i have some trouble with the 964 that i cant figure out...
I am having trouble activating the defrost function and heating at maximum speed (level 4).
What I Have Done So Far:
THANK YOU!!
I am having trouble activating the defrost function and heating at maximum speed (level 4).
What I Have Done So Far:
- I replaced all blown fuses related to the fans and all others in general.
- I replaced a faulty relay for the rear blower motor in the engine bay.
- The rear blower now spins quietly when the key is in ignition position 1.
- I upgraded the rear temperature resistor.
- I checked all fuses – they are good.
- The front blower fans spin correctly.
- When heat turned up and blower speed 0 to approximately 1.8, everything works fine.
- From blower speed 1.9 up to 4:
- The blower starts for a few seconds and then shuts off.
- The same issue occurs with the defrost function – it starts for 2–3 seconds and then stops.
- On the cold setting, the blower works all the way up to level 4 without any problems.
- Heat is not mixing:
- I get only cold air on one setting and only hot air on another, with no temperature blending.
- The servos are checked and are working correctly.
THANK YOU!!
