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QB93Z · 04-08-2017

In your drawing, you show the coolant flow path from the Injector Housing Coolant Manifolds to the Hot side heater hose and mention the "Recycled Coolant opens at 5psi over pressure". That feature is a small disc and spring on the "back" of the thermostat. The disc is what creates a differential pressure across the heater so that there will be flow. That disk has a notch (opening) in it so that there is always some coolant flow in the system. I believe that notch will affect the engine temperature at low engine rpm and low car speed.

Jim

04-08-2017	#4
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: The Thermostat Housing Functions In your drawing, you show the coolant flow path from the Injector Housing Coolant Manifolds to the Hot side heater hose and mention the "Recycled Coolant opens at 5psi over pressure". That feature is a small disc and spring on the "back" of the thermostat. The disc is what creates a differential pressure across the heater so that there will be flow. That disk has a notch (opening) in it so that there is always some coolant flow in the system. I believe that notch will affect the engine temperature at low engine rpm and low car speed. Jim