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coolant-flow.jpg Coolant Flow for 4.6L modular engine

Note that: before the t-stat opens (engine cold), ALL of the water pump's pressure goes thru the heater core.  So the high coolant flow at that time will self-bleed any air out of the heater core, but it can also overpressure the core, which is why Ford is now adding a restrictor to many vehicles.  See the TSB in this caption:

[url=http://www.supermotors.net/registry/media/743849][img]http://www.supermotors.net/getfile/743849/thumbnail/heatercore.jpg[/img][/url]
coolant-flow.jpg | Hits: 6334 | Posted on: 1/2/05 | View original size (60.82 KB)

Coolant Flow for 4.6L modular engine

Note that: before the t-stat opens (engine cold), ALL of the water pump's pressure goes thru the heater core. So the high coolant flow at that time will self-bleed any air out of the heater core, but it can also overpressure the core, which is why Ford is now adding a restrictor to many vehicles. See the TSB in this caption:

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