Throttle Body Preheat

The little pipe stub half way up the thermostat housing is coupled via a rubber hose to tubing that runs under the upper plenum to the base of the throttle body to heat the throttle plate, I assume for de-icing. Coolant return is via a parrallel path to another pipe stub just forward of the thermostat housing on the heater return pipe.

From: Tin Man

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