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Old 02-03-2010, 11:57 AM   #1
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Join Date: May 2008
Posts: 173
Generator Radiator Leaking

I crawled under my generator yesterday when I saw a couple of coolant drips on the bottom of the radiator. I thought it was loose hose clamps and tightened them all. Then I noticed two places on the bottom side of the radiator which had fresh coolant drips. Pulling the top off of the generator confirmed that the radiator has two pinhole leaks.

I have a total of 190 hours on the generator. This is obviously a faulty radiator, but I am well out of warranty.

Has anyone else had their Onan radiator leak/replaced? I can replace the radiator myself, but I dread to hear the radiator cost. I may try some radiator stop leak, since they are pinhole sized leaks.

The only way to check for this type of leak is to crawl under the generator, and look up at the bottom of the radiator with a flashlight.

2006 34' Limited
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Old 02-03-2010, 12:36 PM   #2
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Join Date: May 2003
Location: Winter Haven Brownsville, TX
Posts: 1,141
I changed the coolant in mine last year and found no signs of leakage. If you can get the side panels off it would be easy to remove and take it to a radiator shop. The problem I had is with the right side panel. The bottom bolt is trapped behind a metal gusset. I was able to get the bolt out by drilling and chiseling.

Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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Old 02-07-2010, 03:36 PM   #3
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After checking around, I can get a new radiator from Cummins for $147. Much less than I expected. I will be replacing the radiator.
2006 34' Limited
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