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knocking

  1. 2000 Beetle A/C knocking when turned on

    1.8 Liter Turbo
    I have a 2000 Beetle 1.8T. I have been having an issue with something with the A/C unit. When I turn on the A/C with the A/C button pushed and lit, there is a knocking that randmoly starts coming from the engine compartment, typically when I am stopped at a red light. I can rev up the engine...
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