Use of???

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12-07-2022, 12:29 PM

ynot321AB1

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Use of???

See pic, on right head of a 239

there are two screw in ports, I know one is for the Temp sensor but what is the other port for?

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12-07-2022, 12:32 PM

52 Merc

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Heater hose. Hose goes from head to heater, then the return hose goes from heater to water pump.

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12-07-2022, 01:38 PM

ynot321AB1

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Thank you, so if i don't have a heater at this time cna I just block this off?

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12-07-2022, 01:41 PM

52 Merc

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Yes. Be sure to block off the port on the water pump, too, or you'll have a mess.

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12-07-2022, 04:24 PM

ynot321AB1

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Good point, thank you

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