Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Which direction does coolant flow?

 
Old 06-11-2019, 07:47 AM
  #26  
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Default Re: Which direction does coolant flow? (Spoon Hybrid)

You're right!
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Old 06-11-2019, 08:33 AM
  #27  
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Default Re: Which direction does coolant flow?

The pump doesn't flow any coolant, it just builds pressure. The thermal heat moves the coolant through the system. The hot coolant moves up in the motor and once cooled goes down into the radiator. The thermostat keeps the hot coolant in the engine until it goes put to the radiator
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Old 06-11-2019, 09:36 AM
  #28  
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Default Re: Which direction does coolant flow?

Another way to look at it is what direction would the water flow if there was no water pump? The water in the radiator cools down and becomes more dense and flows downward due to buoyancy. It's called natural convection. You would not want your pump (forced convection) to work against natural convection. It would require a larger, more powerful pump to overcome the natural forces. Also, if you shut the engine off, the coolant flow will coast down, but continue to flow due to natural convection. If you pumped in the reverse direction, when you shut off the engine, you would have a flow reversal, with no flow for a moment.
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