Coolant change question - Wrist Twisters
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post #1 of 8 Old 04-07-2019, 01:32 PM Thread Starter
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Question Coolant change question

I just did a coolant drain & fill on my 2007 Honda 919.
I followed the Honda shop manual instructions to the letter.
I removed the radiator cap prior to draining at the water pump.
When I refilled the system it only took 2 qts. of coolant. The manual says the capacity is 3 qts.
I filled it at the radiator cap and ran the engine and blipped the throttle to remove air in the system.
I also drained and filled the reserve tank.
I drained all the old coolant into a 10 qt. bucket. I did not spill any.
Using a ruler and my best guesstimation, I got about 2.5 qts out of the system.

What could I have done wrong, if anything?
Why would it only take 2 qts. ?


Thanks for any answers or advice.

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post #2 of 8 Old 04-07-2019, 03:20 PM
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Did you let the engine warm up enough for the thermostat to open?
I'm thinking there might still be some air in the system.
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post #3 of 8 Old 04-07-2019, 03:49 PM Thread Starter
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I let it idle for 4 minutes and than flipped throttle a few times. Then I let it idle until I saw no bubbles.
Do you think I should run it for longer?

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post #4 of 8 Old 04-07-2019, 06:11 PM
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Maybe 4 mins isn't long enough. If it were me I'd let it warm right up, get things good and hot.

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post #5 of 8 Old 04-08-2019, 12:27 AM
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I'm not an expert on our Honda's system, but generally the reserve will fill the main as if it were two system and the main has priority. That doesn't mean that it will automatically burp the air out.

IIRC, its the low pressure event that causes a draw from the reserve, so an air pocket would really screw that up.

I would let it run till you get the fans to come on, maybe kick the choke to cause the idle to kick up a bit.

A temp probe at the fill neck should tell when it's up to temp.
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post #6 of 8 Old 04-08-2019, 05:02 AM Thread Starter
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Thanks guys.
I'll take another shot at it after work today.

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post #7 of 8 Old 04-08-2019, 07:31 AM
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4 minutes likely isn't long enough to open the thermostat. Also, unless you use pressurized air or something to force coolant out you're never going to get it all out... I'd file this under "don't worry about it and ride" once you run it enough to make sure the thermostat opened and there's no air you should be good to go.
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post #8 of 8 Old 04-08-2019, 06:41 PM Thread Starter
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Thanks everybody!

I ran it again and let it get hot to the point of steaming. There were no air bubbles coming out and the coolant began to rise to the top of the filler neck.
I shut it off, let it sit a minute and topped it off. I checked the level in the reservoir and it was good.
Took it for a 20 minute ride and the temp needle barely got above cold.
Checked everything again when I got home and it's all good.

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