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Modern
Engine Cooling System Explained The
engine cooling system has performed two significant duties for at least
the last thirty years. First it keeps the engine within normal operating
temperatures. In most vehicles this is between 180 and 207 degrees
Fahrenheit. To accomplish this we use a pump to circulate water and
glycol mixture through the engine and radiator. The radiator is used to
dissipate heat from the glycol mixture. A pressure building radiator cap
is used to increase the boiling point of our glycol mixture. For every
pound of pressure we can apply it increases our boiling point by three
degrees. So if we have a fifteen-pound radiator cap then we increase the
boiling point of our glycol mixture by forty-five degrees Fahrenheit.
This allows our mixture to be pumped through the engine passages without
boiling. Because we want our engine to run efficiently we need it to run
at a certain temperature. To allow us to control the minimum operating
temperature we use a thermostat. This restricts the flow of glycol until
it reaches between 180 and 195 degrees Fahrenheit. It accomplishes this
through the use of a wax pellet that expands when heated, lifting the
valve off it's seat. Now we need to control the possibility of over
heating. We will do this through the use of a fan; some fans are
operated by belts and run all the time. Sensors and computers that
continually monitor the temperature of the glycol mixture activate some
fans. The temperature of our glycol is sent to the computer continuously
by our sensor, when our glycol reaches a certain temperature the
computer activates a relay, which in turn engages our electric cooling
fan. The components that perform these duties have changed over the
years, but the principle of what is being accomplished remains the same.
On the other side of glycol, engineers didn't take long to realize
rather than just dissipating the heat from the glycol into the
atmosphere, we could use it to provide passenger comfort with little
change or cost. So they inserted a smaller radiator called a heater core
into the glycol flow, put a fan on one side and radiated the heat into
the passenger compartment. They incased this system into what is known
as a heater box and added vents and plastic ductwork to it allowing for
even better comfort. In present day automobiles the heater box is not
always evident, but it is there, just a lot more compact. It is much
more refined and uses several doors and flaps to help provide the best
possible comfort zone to the driver and his or her passengers. Source: Mechanic Tips COPYRIGHT © CHRIS C. AND CALL ENTERPRISES 1999-2000 THIS PAGE WAS UPDATED 02/29/2004 This site is about my Jeep. My goal is to help you to better your Jeep through my experience. Thanks for visiting..... Trailhed.com DISCLAIMER: Any usage or adaptation of any or all of the information provided here or on any or all of my web pages is purely at your own risk. You must take into account your own circumstances and vehicle requirements when attempting to utilize any or all of the information provided on any or all of my web pages. I assume no liability or responsibility for any results, damage, or unforeseen circumstances related in any way to the usage or adaptation of any or all of the aforementioned information. Enjoy |
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