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When I bought my 67 the po said it needing a heater core because it leaked....Well, the heater is not plumbed but it still puddles on the passenger side floorboard after a rain.....Is there a common spot that these leak ?? I noted the cowl cover is not removable so it might be a bear to get to.....Thx
 

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Unfortunately a cowl leak in the '60's Ford and Mercury's is pretty common. A tough thing to repair. Once you pull the heater box when you change out that heater core you should be able to look up under that dash and inspect for cowl leaks on the passenger side of the cowl.
 

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Yep sounds like the dreaded cowl leak. I did mine and it was quite labor intensive and took a lot of time. Drill out about 200 spot welds from the cowl. Fun.
 
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