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Coolant Overflow Reservoir

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Old 02-12-2012, 03:21 PM   #1
97 Tacoma [OP] 97 Tacoma is offline
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Coolant Overflow Reservoir

Replaced the t-stat (97 2.7L) when I flushed and filled the radiator (bad gas mileage, low heater output; verified it was bad in hot water on the stove, also that the new one was good). Heat is better as is the MPG.

Read the Haynes manual about the coolant overflow reservoir and it states:"If the system pressure exceeds the cap pressure-relief value, the excess pressure in the system forces the spring loaded valve inside the cap off its seat and allows the coolant to escape throught the overflow tube into the coolant reservoir. When the system cools, the excess coolant is automatically drawn from the reservoir back into the radiator."

Huh?!? So it takes excess pressure just to move the spring to release coolant into the reservoir, but it magically can reverse its flow with the spring fully seated? I don't have a PHD in fluid dynamics but this makes no sense.

Thanks,
Missing winter in Minnesota
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Old 02-12-2012, 06:47 PM   #2
I have a problem for your solution…
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There is a vacuum controled one-way valve that allows coolant to flow back into the rad. When the rad cools the coolant contracts making a vacuum in the rad, which sucks the one-way valve in the cap to open, drawing cooling from the reservoir back into the rad
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Old 02-12-2012, 06:51 PM   #3
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jberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shedjberry813 is one of the sharper tools in the shed
 
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It's not fluid dynamics. It's vacuum/pressure.
Rather than type out how it works...Google is your friend.

http://auto.howstuffworks.com/cooling-system7.htm
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Old 02-12-2012, 06:52 PM   #4
I have a problem for your solution…
Snowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shedSnowman is one of the sharper tools in the shed
 
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Your pic is better than mine. haha color!
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Old 02-13-2012, 08:01 AM   #5
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Thanks Snowman, especially for the pic. The FSM and Haynes did not say how, just that it did.
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