Engine Cooling Explaination - Defender Source
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  #1  
Old October 15th, 2010, 12:34 PM
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DD90
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Engine Cooling Explaination

Can someone explain the mechanical process??

I've seen the diagrams in the shop manual but need some detail.

My understanding is the following (please edit or correct as needed):

1. Water pump pulls water from bottom of radiator AND the heater return feed

2. Water pump then pushes this water into the top radiator hose OR the engine itself

3. Water goes through engine and goes to heater matrix

4. Water returns to pump from heater matrix

My main questions are:

1. After the water pump does the water have a "choice" of going to the engine OR the radiator, ie is there a "Y-tube" that splits the water to BOTH?????

2. Is there a separate return for water from the engine or does ALL the engine water go to the heater matrix and back to the pump???

I already understand that when "cold" the water gets blocked from going to the radiator and returns to the pump via a bypass hose.
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Old October 15th, 2010, 12:54 PM
The Dro
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Quote:
Originally Posted by DD90 View Post
1. After the water pump does the water have a "choice" of going to the engine OR the radiator, ie is there a "Y-tube" that splits the water to BOTH?????
Yes... it's a by-pass at the thermostat.
Quote:
Originally Posted by DD90 View Post
2. Is there a separate return for water from the engine
Yes

Page 2 has a nice simulation that shows how it works.

http://auto.howstuffworks.com/cooling-system.htm

http://www.samarins.com/glossary/thermostat.html
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Old October 15th, 2010, 01:53 PM
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I think that clears it up for me.

What I did not understand was that water is getting PUSHED directly from the engine to the thermostat. I thought it was ALL going through the heater matrix. It looks like part goes through the matrix and part goes directly to the thermostat and then to the radiator or back to the engine depending on the setting of the thermostat.

I also thought the pump pushed the water directly to the radiator but it seems like it only pushes in through the engine which then goes back the the radiator or the matrix.

Thanks.
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