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    "CLUNK" IN RAD/HEATER HOSES

    '91 XLT - OUTDOOR TEMPERATURE IS BELOW FREEZING - TRUCK WARMED UP - HEATER ON FULL BLAST - THERE IS A SPURATIC LOUD CLUNKING SOUND(AND FEEL)IN THE UPPER RAD & TWO HEATER HOSES. SOMETIMES FOLLOWED BY A CLICK. IT FEELS/SEEMS LIKE AN AIR POCKET MOVING IN THE HOSES. - USED 1 INCH OF COOLANT...
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