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post #1 of 35 Old 11-30-2017, 09:16 AM Thread Starter
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Cooling System and Flow

Can someone describe the flow diagram of 7th Gen cooling system? Try to be descriptive as possible e.g. the fan turns on at ?? temperature.
Also, is there any resistance ratings for the ECT sensor to verify correct readings?

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post #2 of 35 Old 11-30-2017, 11:55 AM
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The fans having nothing to with flow. That's the water pump and thermostat's job, unless Drew03Accord states otherwise. Drew should tell you that if a stat is stuck closed, there is no flow at all. If it's stuck open, flow all the time. Most stats fail open, not closed. t-rd prolly has the temps when your fans kick on when the A/C is not engaged.


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post #3 of 35 Old 11-30-2017, 12:08 PM
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He asked fir a description of the diagram, not the system itself. I'm guessing he'd like a description of the line widths, word fonts, arrow colors, etc.

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post #4 of 35 Old 11-30-2017, 12:59 PM
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Your fan on temperature will depend on which engine you have. My 2006 V6 turns the fan on at 202F. My 2005 I4 would turn the fan on above 210, maybe 212? I don't remember for sure. Normal operating temperature for both is 186, thermostat fully open at 193.

I would suggest comparing temperatures between sensors while the engine is cold, outside temp sensor(if equipped), intake temp sensor, and coolant temp sensor. If they are different, something is probably wrong.

Here is the V6 cooling system.
Name: V6 cooling system.jpg
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post #5 of 35 Old 11-30-2017, 02:42 PM
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I'm guessing he'd like a description of the line widths, word fonts, arrow colors, etc.
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Your fan on temperature will depend on which engine you have.
OP can't give out no information. You boys are gonna have to earn this one.

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post #6 of 35 Old 11-30-2017, 03:51 PM
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Quote:
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He asked fir a description of the diagram, not the system itself. I'm guessing he'd like a description of the line widths, word fonts, arrow colors, etc.
My bad. Since we are past Enlightenment, he could be searching for an exploded-view schematic, flow process chart, or one of several other diagrams that would suit his needs. Perhaps bobbo can assist since he is a real whiz with fonts and colors.

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post #7 of 35 Old 11-30-2017, 05:34 PM Thread Starter
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Which direction does the coolant flow? Out the radiator top hose into the engine or out the lower hose into the thermostat?
I think its the former and if so, is it possible for no coolant to be near the thermostat thus not opening it because there is no temperature to measure?
Note: My question is based upon an I4.
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when you removed the stuck closed stat and replaced it a few days ago and burped the system that resolved your overheating issue, did you happen to notice which direction the valve on the stat was pointing? that is the direction of the flow. ain't that right Drew03Accord?

it's very possible for there to be no coolant at the thermostat, but that would mean you are WAY low on coolant or have a huge pocket of air the size of texas.

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post #9 of 35 Old 11-30-2017, 06:14 PM
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Quote:
Originally Posted by HeresOtis View Post
Which direction does the coolant flow? Out the radiator top hose into the engine or out the lower hose into the thermostat?
I think its the former and if so, is it possible for no coolant to be near the thermostat thus not opening it because there is no temperature to measure?
Note: My question is based upon an I4.
Probably flows from radiator lower hose into thermostat. Here is what I found so far, no mention of fan on temps or resistance values yet.
Name: I4 cooling system.jpg
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EDIT: Here is some more. Fan switch testing.

Name: I4 radiator fan switch testing 1.jpg
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Name: I4 radiator fan switch testing 2.jpg
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post #10 of 35 Old 11-30-2017, 06:59 PM
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The upper radiator hose on every car I've seen brings hot coolant to the very top of the radiator....gravity (and the pressure created by the water pump) does its thing and the hot coolant cascades down the radiator internals as you drive the car- allowing cooler air to be forced towards the radiator to dissipate the heat that was absorbed by the cooling fins of the radiator.

By the time the coolant gets to the bottom of the radiator, and to the lower radiator hose- the coolant may be 20-30 degrees F cooler than the hot coolant entering the top of the radiator.

In olden days the radiator fan was belt driven- always "on". Nowadays it is electric and switch triggered.

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post #11 of 35 Old 11-30-2017, 07:12 PM
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So from my interpretation of what the service manual says, 2003-2004 I4s have one ECT sensor. 2005-2007 have two. Couldn't find anything on resistance values, just a whole bunch of continuity test pictures.

Older models
Name: I4 ECT location 2003.jpg
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Name: 2007 I4 ECT 1.jpg
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Name: 2007 I4 ECT 2.jpg
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post #12 of 35 Old 11-30-2017, 08:12 PM Thread Starter
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Resistance values of these sensors will provide better diagnostics of problems, rather than a simple continuity test. Honda should've provided those values.
Anyways, if you pour coolant down the radiator, will that go all the way to the thermostat? If so, how will that coolant heat up if it's between the thermostat and radiator, thus heat from the engine should never reach it.

On the attached picture, the lower radiator hose is attached to the black opening of the thermostat. The sensor of the thermostat is on the interior of the engine block. So coolant on engine block has to activate the thermostat. But what if there is not enough coolant in the engine? Thus overheating problems. How can you get coolant into the engine on these Hondas?
This is all weird because (I think) more commonly for vehicles, the thermostat is attached to the top radiator hose and it will push open the thermostat and flow into the radiator.
As shown in the video.


A question for you: is the sensor in the blue circle or in the red circle?
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post #13 of 35 Old 11-30-2017, 08:30 PM
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post #14 of 35 Old 11-30-2017, 08:33 PM
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the red circle is the valve that i asked you about. in the pic, the coolant would be flowing through the stat housing and down past the valve, or top to bottom.

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post #15 of 35 Old 11-30-2017, 10:56 PM Thread Starter
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the red circle is the valve that i asked you about. in the pic, the coolant would be flowing through the stat housing and down past the valve, or top to bottom.
If it flows from top to bottom, then the coolant at the bottom of the radiator has to be hot to open the thermostat? But isn't the actual sensing component in the red circle?

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