Vintage Mustang Forums - View Single Post - Hex screw on 67 289 Thermostat housing leaking
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post #7 of (permalink) Old 06-26-2019, 05:34 PM
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Mustang4SF's Avatar
Join Date: Jul 2017
Location: Bay Area
Posts: 529
I have the same housing installed and it was also leaking at the beginning. 6-7 turns of Teflon tape fixed the issue. Later I installed the T-sensor connected to the dashboard, 6-7 turns of Teflon it it is good.

Keep in mind the direction you wrap the Teflon tape around. I know it is a low brainer, but sometimes I do it wrong at the beginning.

1966 Convertible (Plant: San Jose, CA)
289 2V, PS, AC
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