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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
I think those are compression fittings so the sealing surface on the inside area where they contact and seat together. They should be clean and dry with no tape or goop.
Teflon tape or permatex gasket sealer on the threads is for tapered threads like pipe thread fittings.

The threads on the thermostat body are aluminum and will gall and keep the fitting from tightening up good if there is no grease or lubricant on the threads.

Put anti seize on the threads or grease if none is around and retighten them.
Old 06-22-2010, 04:14 PM
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