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Old 09-19-2016, 09:43 AM
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Paris12Man Paris12Man is offline
Join Date: Apr 2010
Location: Paris, TX
Posts: 261
Default Coolant change

How often should the coolant liquid be changed? I'm sure it's written someplace, but I can't find it. Thanks.
Steve Garrett - 903-272-5639,
N905RV - 436 hrs to date
Home field XS30
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Old 09-19-2016, 10:58 AM
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DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,838

The RV-12 maintenance manual refers you to the Rotax maintenance manual. The Rotax line maintenance manual says only that it must be replaced when overhauling the engine, or when the manufacturer says to replace it. They don't say whether they are referring to the coolant manufacturer, or the airplane manufacturer. So... apparently, check with the coolant manufacturer.

I figure the cooling system has to be completely drained to replace the hoses every five years, so that's when it gets new coolant. I think the jug of Dex-Cool I bought also says 5 years/150K miles.

Edit: Of course this assumes Dex-Cool coolant, there are other types. I know nothing about them. Check your coolant for more information about its service life, I guess.
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
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Last edited by DaleB : 09-19-2016 at 11:09 AM.
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Old 09-19-2016, 03:46 PM
Chrysopelea Chrysopelea is offline
Join Date: Jan 2016
Location: santa rosa CA
Posts: 90

Upon a recent pre-flight check, I found my overflow tank tube cracked in the same manner as in your pic.

I did the same, removed, cut 3/4" off, and reinstalled. This IMO should hopefully hold until my 5 year full hose changeout in 2 years.

Originally Posted by PilotBrent View Post
After a few hours of Young Eagle flights today, and about to put my -12 back in the hanger, notice a puddle forming of Dexcool coolant on the taxiway. The hose attached to the reservoir for the coolant had failed. Small crack in the rubber and the hose apparently fell off. Lost about 2/3 of the coolant in the overflow bottle but coolant level in the system itself unaffected. Rest of hose looked fine - cut off about 1/2" and reinstalled. Probably discovered it just after it happened as a lot of the coolant was still dripping through the engine area.

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Old 03-24-2017, 10:56 AM
Ueli N Ueli N is offline
Join Date: Oct 2013
Location: Blaine WA
Posts: 28

I have the same problem with the overflow bottle hose keeps leaking and splitting.
It seems the hose is too small in diameter for the application.
I assume the problem is a result of making a standard hose fit a metric size nipple.
Has anybody found a better replacement hose than the supplied 3/16" hose?
Would like to have that fixed before first flight.
final stages.
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Old 03-24-2017, 11:06 AM
John-G John-G is offline
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 493

Originally Posted by Ueli N View Post
Has anybody found a better replacement hose than the supplied 3/16" hose?
Ueli - Yes, use 7 mm metric hose. I got some from a foreign car parts place. To get over the coolant bottle that 3/16 hose is stretched to 9 mm which is just about double its normal size.

Below is a post on my blog that covers the issue.

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RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
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Old 03-24-2017, 11:25 AM
Ueli N Ueli N is offline
Join Date: Oct 2013
Location: Blaine WA
Posts: 28

Thanks John for your quick reply, and your homework on the subject.
I'm going to look for a bigger hose.
final stages.
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Old 03-25-2017, 10:26 AM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,215

Seems like 1/4" would be close enough.
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