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Sensors are on the thermostat housings - at least they are on the 5.7's, I'd also pull your hoses - as I had one that put on that was an auto 1" hose that had partially collapsed - and gave me about the same temp difference.
How about heat exchangers? When were they replaced? or cleaned? You can get them cleaned at a radiator shop - you can also run white vinegar through them that will remove some of the scale. I'd get em cleaned or replaced if they haven't been lately (last 5 years)
Nice looking boat.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey
Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2
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