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Old 09-13-2011, 06:02 AM   #1
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Winnebago Owners Club
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coolant leaks 2006 Mountain Aire

I have a 2006 Mountain Aire Mh and have had several coolant leaks, all on the road costing many$$ to repair. The mechanic's say that the coolant hose is bad. has anyone else had this problem?
Thanks in advance
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Old 09-13-2011, 07:07 AM   #2
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They have had issues with the heater hose runs on the Spartan chassis Diesel pushers.
John, Pam, and Aria
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2015 London Aire
2015 GMC Seirra
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Old 09-13-2011, 07:53 AM   #3
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First of all Ironman

Sorry to hear about your problem. But, you came to the right place for answers.

I would suggest that you look in the Spartan Motorhome Chassis Forum & the Cummins Engine forums for these type of questions. They are more brand-specific than the generic Class A Motorhome forum.

Good luck finding your answer.

Mark & Sheila Heilman & The 3 Fur-Ball Princesses - Nikko, Mai-Thai & Andy
'07 MADP 4523, 2012 GMC Terrain SLT 2 wd
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Old 09-14-2011, 01:06 AM   #4
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Some coolant contains an acid that attacks silicone hoses and gaskets. I have the info someplace, trying to find it.

OK, here is the info, this is what it SHOULDN'T contain:

sodium 2-ethyl hexonate (19766-89-3)

If your coolant contains it AND you have silicone hoses this could be the source of your leaks. I didn't know about the problem til earlier this year and have been using coolant containing the acid with no problem. But I have new coolant and distilled water just waiting for me to finish a few other products and do it again to get rid of the acid.

According to Cummins silicone hoses/gaskets were NOT used in ISC's and ISL's shipped for motorhome use. But some well meaning person could have changed them at some time.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
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Old 09-14-2011, 12:03 PM   #5
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Same problem last year with my 2004 DSDP. Turned out to be the water pump. This little devil has a habit of leaking just some of the time just before going completely.
Good luck!
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Old 09-14-2011, 07:14 PM   #6
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Thank you folks for the information, I will check the coolant and also check out these other sites
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