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Old 12-04-2010, 09:32 AM   #1
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1994 Allegro Bay Cummins Diesel

I'm looking to purchase a motorhome. The coolant tank goes down below the low mark but no lower. Where could it be going?

Thanks,

Jay
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Old 12-04-2010, 12:18 PM   #2
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I assume your question implies that the coolant level drops below the low mark after operating the engine and the coolant system was full prior?

If the coolant has recently been replaced, perhaps the mechanic forgot to "burp" the system to remove all trapped air. Coolant then exits via the overflow tube during operation of the engine.

That occurred on my rig after a shop did the coolant change. After three months of engine shutdowns and top offs due to "low coolant" I bled the system and the problem stopped. (Use coolant bleeder valve and run front dash heater.)

Pull the oil dipstick and see if any coolant is present in the oil.

Otherwise, a pinhole leak in the plumbing could cause the coolant to disappear.
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Old 12-05-2010, 09:38 AM   #3
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1994 Allegro

They did say they saw some coolant from the heat exchange up front but the heater still works.

Thanks for any help with this.

Jay
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Old 12-05-2010, 11:40 AM   #4
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Then the plumbing there needs attention. I cannot help you with the front heater. I learn as I try to fix problems.
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