Troy - it sounds like your heater core is leaking. Remove the heater box and take look at it.
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69 GTO Judge, Liberty Blue/Parchment, RA3, 4-speed
69 GTO, Verdoro Green, Green, 400, 4-speed
69 Firebird 400, Starlight Black/Black, RA3, 4-speed, 611 RA Inlet
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