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8V92 coolant leak
#1

I recently had the water pump changed since it started leaking. Since then I drove it to Cedar Key, then over to Silver Springs. Now I'm in Summerdale, AL about 900 miles of driving since getting the water pump changed.
A couple days ago in Silver Springs I noticed the coolant overflow tank was almost empty so I added 1/2 gallon coolant. When I pulled into Summerdale the coolant tank was almost empty again. I just looked all around the engine and hoses, in all of my basement compartments, and anywhere else I thought I'd maybe find a gallon of green coolant that leaked out. Nothing!
Engine oil looks good and hasn't been growing, tranny fluid and power steering fluid both look clean.
I was thinking maybe I have an air bubble that is just now working out of the cooling system but just want to make sure I'm not overlooking anything important.
I just added water to the overflow tank to see if it leaks out there while I'm sitting for a couple days.
Any ideas?

Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
PO 1999 Foretravel 36'
1998 Newell 45' #486 

1993 Newell 39' #337 
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#2

Sounds like the air bubble has worked itself out. When i bought my coach a couple years back, I changed the air compressor coolant hoses. Fill the coolant many times before that pesky air bubble went away.

Ernie Ekberg
Bluebird Wanderlodge
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#3

Forest,
If the problem continues, I would close off the 4 valves on the engine that allow coolant to go forward. When I changed my pump a year ago, I closed off all of those lines & have never had to add coolant.

Gordon
1991 41.5' #266
8V92 DDEC II
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#4

those valves are 2 out and 2 return lines for the hotwater heater heat exchanger, the bay hot water radiators for heat, the one at least on mine that is under the bed and the dash heater. one set goes likely to just the hot water heater and the other set to all the other things.

good way to find out if the leak is forward of the engine, but if you want any of those things to work, then you will want to turn them back on.

tom

2002 45'8" Newell Coach 608  Series 60 DDEC4/Allison World 6 Speed HD4000MH

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