Hybrid Car – More Fun with Less Gas

Engine starts when car switched on - why? - Page 3

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Posted by ransley on September 19, 2010, 10:54 am

All cars have coolant overflow tanks , its not for storing heat its
coolant overflow

Posted by Elmo P. Shagnasty on September 19, 2010, 3:20 pm

In article

nonononono, he's right.  The 04-09 Prius models use a vacuum flask into
which the coolant is pumped AFTER the car is turned off.  The goal is to
store heat that is pumped back INTO the system the next time the car is
turned on.  This helps the car heat more quickly, which helps with

In fact, after an overnight sit one can hear the coolant pump back out
of this vacuum bottle after one opens the car door.  This is in
anticipation of the car being turned on to drive.

Posted by Peter Granzeau on September 24, 2010, 8:10 pm
 On Sun, 19 Sep 2010 11:20:38 -0400, "Elmo P. Shagnasty"

I will say that this seems to be a lot of complication--and cost--for
very little effect.

Posted by News on September 24, 2010, 8:24 pm
 Peter Granzeau wrote:

It's a Prius, eh?

Posted by Elmo P. Shagnasty on September 25, 2010, 1:49 am

Toyota was trying to achieve something, and the devil is in the details.

Taken as a SYSTEM, the Toyota Hybrid Synergy Drive is a rolling work of
art--and the SYSTEM includes the vacuum bottle.

But by itself, would adding the vacuum bottle to a normal car do
anything for it?  Sure, it would do the same thing--that is, present
warm coolant to the engine so that the engine heats up faster to help
lower emissions.  But if the rest of the car isn't particularly tuned
for that task, the vacuum bottle would e a lot of complication and cost
for very little effect.

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