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[Solved] Superb II 1.9 tdi 2010 - The fan runs all the time after the engine is off

gofer62 9297 16
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Why does the radiator fan run after the engine is switched off on a cold 2010 Superb II 1.9 TDI with no fault codes?

The fan controller/module in the fan motor is likely faulty, not the temperature sensor, when the fan starts after ignition off and no errors are stored. [#16259190] [#16291441] The fan assembly has two thick power wires and two thin control wires, so you can unplug the thin ones to see whether the problem disappears; if it does, the fault is in the fan unit itself. [#16259271] A measured current draw of 1.85 A is far too high for standby/leakage current, which supports a defective fan module rather than normal operation. [#16260803] The later follow-up also confirmed the repair: the module on the fan was damaged and the fan had been running because of it. [#16291441] [#17472150]
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  • #1 16258962
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    Hello, please help me solve the problem with the engine fan running.
    After overnight parking, the engine is cold, the battery is disconnected, I connect the clamp and after 10 seconds. the fan on the radiator starts working, the key in the ignition is turned to ignition, the fan slows down after starting the engine, the fan stops working. After switching off the engine and after 10 seconds the fan starts working again. There are no errors when connected to the computer.
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  • #2 16259008
    rafal35
    Level 18  
    Posts: 173
    Help: 23
    Rate: 47
    The easiest way would be to connect with something and check for any errors. Maybe the temperature sensor is broken and gives information that the temperature is too high or out of range.
  • #3 16259095
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    Which sensor colleague mean?
  • #4 16259190
    carrot
    Moderator of Cars  
    Posts: 8375
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    It is rather not a sensor, since the fan works after switching off the ignition, the controller is in the fan motor.
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  • Helpful post
    #5 16259271
    grala1
    VAG group specialist  
    Posts: 9812
    Help: 1495
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    The controller comes with two thick wires and two thin ones.
    Thick is power, thin is a plus after the ignition switch and fan speed control, probably a green wire.
    Unclip the thin ones and how it goes without them is a problem in the fan.
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  • #6 16259384
    Anonymous
    Anonymous  
  • #7 16259425
    MobilTruck
    Level 31  
    Posts: 1703
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    @ Falubaz1 Tak.BLS i BXE
  • #8 16259431
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    I gave the power to the windmill for those thick for a short time and the windmill is working.

    Added after 2 [minutes]:

    One more question, can the current consumption of the battery be 1.85 A, that's what I measured?

    Added after 1 [hours] 36 [minutes]:

    Pictures of this fan
    Attachments:
    • Superb II 1.9 tdi 2010 - The fan runs all the time after the engine is off IMG_20170207_151117.jpg (3.93 MB) You must be logged in to download this attachment.
  • Helpful post
    #9 16260803
    grala1
    VAG group specialist  
    Posts: 9812
    Help: 1495
    Rate: 5036
    So it looks like the fan is broken.
    Too much consumption.
    It should be about 20mA or 0.02A
    Unless you ask about the fan current it can be.
  • #10 16261386
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    Unclipped fan and such current measured in series by the clamp.
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  • #11 16261399
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    gofer62 wrote:
    After overnight parking, the engine is cold, the battery is disconnected, I connect the clamp and after 10 seconds. the radiator fan starts working


    It's the only thing that makes me wonder why you disconnected this clamp The rest is pikuś, the fan turned on, and the electronics are awake.
  • #12 16261444
    ALIBABA I
    Level 33  
    Posts: 2567
    Help: 217
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    Hello col. Strumien wrote why you disconnected the clamp
  • #13 16262789
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    The fan is 100% damaged, I disconnected so as not to discharge the battery.
  • #14 16290035
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    Colleagues will check one of you for what is responsible fuse f6 f7 f8 in the box in the engine compartment.
    Thanks.
  • #15 16291129
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    And what else has not been repaired?
  • #16 16291441
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    The fan is repaired, the module on the fan is damaged, but there is a problem with the leakage of electricity.
  • #17 17472150
    gofer62
    Level 10  
    Posts: 59
    Rate: 9
    Module defective, fan running
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Topic summary

✨ The discussion revolves around a 2010 Skoda Superb II with a 1.9 TDI engine experiencing an issue where the radiator fan operates continuously after the engine is turned off. The user reports that the fan activates shortly after reconnecting the battery, slows down when the engine starts, but resumes operation after the engine is switched off. Despite no error codes being detected via diagnostic tools, various suggestions are made regarding potential causes. Responses indicate that the issue may stem from a faulty fan control module rather than a temperature sensor, with recommendations to check the wiring and current consumption of the fan. The user confirms that the fan is damaged and mentions a problem with electrical leakage. The discussion concludes with a note that the fan module is defective, leading to the fan's continuous operation.
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