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  1. J

    Thumping noise in heater box...valve or flap not opening?

    Is it hard to fix and where do I find a replacement part for it?
  2. J

    Thumping noise in heater box...valve or flap not opening?

    Anyone know anything about what could make a thumping noise coming from the heater box area under the dash of a 93 Yukon?

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