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Old 12-05-2012, 07:55 AM
Khabar Khabar is offline
Officially Welcomed to the 'Fest
Location: Virginia
Join Date: Mar 2009
Posts: 574
Mein Auto: 745i 2005
Coolant flow in the Engine Block
The coolant flows from the water pump through the feed pipe (1) in the engine's V and to
the rear of the engine block. This area has a cast aluminum cover (see following illustration).
From the rear of the engine, the coolant flows to the external cylinder walls and from there
into the cylinder heads.
The coolant then flows from the cylinder heads into the engine block V and through the
return connection (3) to the thermostat housing. When the coolant is cold it flows from the
thermostat (closed) directly into the water pump and back to the engine (recirculating for
faster warm up).
When the engine reaches operating temperature
(85 C-110 C), the thermostat opens the
entire cooling circuit to include the radiator.
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