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

Which direction does coolant flow?

Old 06-11-2019, 07:47 AM
Trial User
Join Date: Jun 2019
Posts: 2
Default Re: Which direction does coolant flow? (Spoon Hybrid)

You're right!
RMOT is offline  
Old 06-11-2019, 08:33 AM
Honda-Tech Member
chrysler kid's Avatar
Join Date: Nov 2003
Location: Plano, Texas, USA
Posts: 1,439
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
chrysler kid is offline  
Old 06-11-2019, 09:36 AM
Honda-Tech Member
NukeNinja's Avatar
Join Date: Sep 2018
Location: Idaho
Posts: 53
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.
NukeNinja is offline  
Related Topics
Thread Starter
Last Post
Northeast (Sales)
10-03-2016 11:20 AM
Acura Integra
11-02-2009 07:31 PM
Forced Induction
08-24-2009 04:50 PM
Honda Prelude
04-09-2008 09:19 PM
All Motor / Naturally Aspirated
03-03-2004 09:29 AM

Thread Tools
Search this Thread
Quick Reply: Which direction does coolant flow?

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: