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At some point in the GT&#8217s life, the defroster plenum was replaced with the black plastic box seen here. We pulled this out of the way, but left it connected to the control cables.
Heater Core Replacement

 At some point in the GT’s life, the defroster plenum was replaced with the black plastic box seen here. We pulled this out of the way, but left it connected to the control cables.  View Related Article

 

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