Water flow direction in radiator


Asked by Jul 04, 2017 at 02:33 PM about the Ford F-150

Question type: Maintenance & Repair

Replaced water pump on 2010 f-150 4.6 3V engine.  Pump has no
connection for radiator hose.  Upper hose connects to thermostat housing,
and lower hose connects to block at bottom of engine on drivers side.   So,
is the water pushed out through the top hose on the thermostat housing to
radiator?  Also, when draining radiator, only about 5 to 6 quarts came out.  
Is the other 9 quarts inside the block.  How would you drain the block if you
wanted to flush the system?

4 Answers


As far as I know coolant enters the bottom and discharges to the top and usually :flushing" is simply removing all the old coolant by Flushing until the water is clear ... most coolant is 50/50 anyhow so you adjust acordingly

1 of 1 people found this helpful.

Coolant leaves the radiator through the lower radiator hose. Circulates through the engine. Then returns to the radiator through the upper radiator hose. There are drains in the block or heads but nobody ever uses them. I'd advise against trying to open them, especially on an older model. You'll likely open up a can of worms! To flush the cooling system I use one of those "Flush N Fill" kits available at your local auto parts store. You can tap into a heater hose with it and use your garden hose to flush out the cooling system. Once the water is running clear, remove the garden hose and drain the radiator. Then add straight antifreeze equal to about half the cooling system's total capacity. HTH. -Jim


Thanks guys. I was going to flush but there is no way I could obtain a 50/50 ratio with only getting 5 quarts out of the radiator when the cooling system holds 16 quarts. I was going to remove the bottom hose from the block, but it is in such a god awful location with the compression clamp on top it's hard to get to, but not impossible. I suspect if I can remove the bottom hose from the block, I can get out another 4 quarts (as least), that way I can fill with full strength plug two gallons of distilled water.

1 of 1 people found this helpful.

You're welcome. Glad to help. That sounds like a good plan! -Jim

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