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AUDI A3 8L 1.6 SR 1999: Constant Fan Operation and Temperature Stabilization Issues

robson97 13662 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16855594
    robson97
    Level 10  
    Hello. I have a problem in the said Audi. It consists in the fact that both fans spin immediately after ignition of the car, so the temperature does not move from 60 degrees ... I removed the radiator fan sensor, but the problem still occurred. I tried to detach and fasten the clamps. After removing the fan controller (relay) the fans did not turn on and the temperature rose normally - the car normally blew warm air inside.

    I wonder what could be the matter. The removed driver had some moisture inside - and probably should be as tight as possible, and I do not know if sometimes it does not make a short circuit somewhere. Fuses all checked. Will you need to replace this driver, or look for a reason somewhere else for now?

    I await your response. Regards.
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  • #2 16855839
    zworys
    Level 39  
    In the Audi A4, after moistening the controller, the fans were spinning all the time, even without the ignition switch on. I don't know how in A3 but in A4 there was a problem with the tightness of the controller housing. Another trace is a problem with the air conditioning. Then the fans may also work incorrectly. Without a tester diagnosis, it is difficult to find a fault on vehicles with electronics.
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  • #3 16856170
    robson97
    Level 10  
    Valuable information, thanks. You just need to turn off the starter for me to start the fans. After turning off the car, the fans are still spinning for about 10 minutes. The wires do not look broken.
  • #4 16858545
    robson97
    Level 10  
    I dismantled the fan driver. There are two coils. After applying 9V in one, the resistance normally increases from 60 to 80 Ohm. In the second, the resistance remains unchanged. Is it supposed to be like this or is there a problem with the coil?
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  • #5 16859418
    zworys
    Level 39  
    Are these coils or relays? did you measure separately (i.e. the element itself) or in the system? If these are relays measured outside the system, the resistance should not increase, unless the housing also has an electronic system, then it may behave differently. If you measured in the system it is difficult to judge. Without checking the installation with a diagnostic tool, it is rather difficult to find a fault on today's cars. Take into account that the work of fans is also associated with air conditioning. Unusual fan operation can be forced just by the air conditioning.
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  • #6 16860529
    robson97
    Level 10  
    I measured outside the system, but in fact without the right instruments it is hard to know what is wrong. I started with the cheapest things. It's better. Namely, I replaced the temperature sensor that is on the hose. I start the car and the fans are not spinning :) They turned on at 75 degrees and each time they turn on at that temperature. So I don't think it's the driver's fault. Now it's a matter of wrong temperature reading. Today I am starting to replace the fan switching sensor (the one on the radiator) and the sensor responsible for the indications on the clocks. Must help :)

    Added after 8 [hours] 4 [minutes]:

    It didn't help .. I don't know - I think I got a thermostat ... Is it hanging or what ... could it be the reason?
  • #7 16882552
    zworys
    Level 39  
    If it were the fault of the thermostat, firstly, the radiator would be cold for a long time, and secondly, if the fan sensor is on the radiator, when the thermostat is blocked, they would turn on at a much higher temperature, and when open, the switch-on should depend only on the temperature of the fluid in the circuit. This is not a thermostat. As I wrote earlier - air conditioning also forces fans to start. The problem may or may not be there. You probably won't find a fault without the tester.

    Read the suggested topics under yours. They concern VW, but they give an idea what may be wrong.
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Topic summary

The discussion revolves around a 1999 Audi A3 8L 1.6 SR experiencing constant fan operation immediately after ignition, preventing the temperature gauge from rising above 60 degrees. The user has attempted various troubleshooting steps, including removing the radiator fan sensor and inspecting the fan controller (relay), which showed signs of moisture. Responses suggest that moisture in the controller could cause continuous fan operation, similar to issues noted in the Audi A4. The user replaced the temperature sensor on the hose, which resolved the fan issue temporarily, but the temperature reading remained incorrect. Further suggestions include checking the fan switching sensor on the radiator and considering the thermostat's functionality, as it may be stuck, affecting the cooling system's operation. The consensus is that without diagnostic tools, pinpointing the exact fault is challenging, and the air conditioning system may also influence fan behavior.
Summary generated by the language model.
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