On a 1996 Explorer intake there’s a vacuum fitting where coolant passes through. What is the purpose of coolant passing through this vacuum fitting? Does the coolant temperature open/close the vacuum supply and if so at what temperature is it open or closed?
If oyu want, you can just pull that entire fittins out, and then tap the hole for NPT and install a hose fitting. The coolant lines just surround a jacket to keep the vac line from freezing up. I forget what that line is used for on the exploder, but it must experience pressure drop which causes freezing under the right conditions so Ford added the coolant jacket to keep it warm