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Audi A6 C5 1.8T Air Conditioner: Fan Not Turning On, AC Functions When Connected Normally

Zipper.PL16 17538 11
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Why doesn't the cooling fan turn on when the air conditioner is switched on, even though the AC system itself works?

The problem is most likely in the cooling-fan control circuit: check the fuses, relays, and sensors, and run AC diagnostics to read any fault codes [#16542963][#16542989][#16543028] In this A6 C5 1.8T the relevant parts are the radiator fan M18, thermal switch S501, high-pressure switch S502, high-speed relay K33, low-speed relay K80, and the fuses F [#16543055] If the AC itself starts but the fan still does not, the fault may be in the fuse, relay, sensor, or the climate-control panel/controller [#16543022][#16543057]
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  • #1 16542952
    Zipper.PL16
    Level 7  
    Posts: 11
    Rate: 7
    The fan does not turn on when the air conditioning is switched on, but the air conditioner works because after connecting it normally goes on
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  • #2 16542963
    spinacz
    Level 42  
    Posts: 8575
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    Fuses checked? Computer Aid diagnostics do.
  • #3 16542972
    Zipper.PL16
    Level 7  
    Posts: 11
    Rate: 7
    Are there any sensors or something like that?
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  • #4 16542989
    spinacz
    Level 42  
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    Yes, they are the most, for this it is worth to do air conditioning diagnostics, it may turn out that it is only a fuse and it may come out that some problem with the sensor or an empty air conditioner can be different.
  • #5 16543011
    Zipper.PL16
    Level 7  
    Posts: 11
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    Klima a few days ago nabita, electrician said to connect the fan under the compressor to turn on together, but the fuse can not withstand voltage 30a and then the blower does not want to run
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  • #6 16543022
    spinacz
    Level 42  
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    Do not listen to this person because it's a combiner not an electrician, and you only damage something more in the system.
    Does the climate itself start and work?
    If so search for fuse or relay damage, but it can be and something else damaged.
  • #7 16543028
    horno
    Level 12  
    Posts: 208
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    Rate: 40
    Do a vagiem test of executive elements and, of course, check what errors in the climate, the factor is quite a compressor starts?
  • #8 16543030
    Zipper.PL16
    Level 7  
    Posts: 11
    Rate: 7
    The air conditioning itself starts
  • #9 16543035
    spinacz
    Level 42  
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    Which car year and what power will I look for the scheme, and what kind of climate?
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  • #10 16543050
    Zipper.PL16
    Level 7  
    Posts: 11
    Rate: 7
    A6 c5 98r, 1.8t 150km

    Added after 38 [seconds]:

    Klima in the sense?
  • #11 16543055
    spinacz
    Level 42  
    Posts: 8575
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    You have a simple layout.
    M18 radiator fan
    S501 thermal switch for the fan
    S502 high pressure switch
    K33 high speed fan relay
    K80 low speed fan relay
    F fuses
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  • #12 16543057
    horno
    Level 12  
    Posts: 208
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    Rate: 40
    There often there were only controllers from the air-conditioning system, ie the control panel of the base to check the disassembly of 5 minutes from someone.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around an issue with the air conditioning system in an Audi A6 C5 1.8T, where the fan does not activate despite the AC functioning when connected normally. Participants suggest checking fuses, relays, and sensors, emphasizing the importance of conducting air conditioning diagnostics. The user mentions a recent recharge of the AC system and a recommendation from an electrician to connect the fan under the compressor, which may lead to fuse overload. Various components are identified, including the radiator fan, thermal switch, high-pressure switch, and relays. The user confirms the AC system starts but seeks further troubleshooting advice.
AI summary based on the discussion. May contain errors.
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