Mike Wahl Posted July 26, 2022 Share Posted July 26, 2022 We have a 2001 Signature with a Onan 12.5 Model HDCAB11506A generator. Last year I had posted we had an issue with over temperature fault. Last year I cleaned the radiator fins and tighten the fan belt and the problem went away. We put over 125 hours on the generator after this work was done. The other day we had the generator running with all 3 roof top AC one and the generator shut down for over temp. Last evening I pulled the top off of the Generator to check the belt and the tension looks fine. From what I can see the belt looks like it is in good condition, however it not easy to see. I can not find any record of the belt being replaced in the documentation we got with the coach. The generator has about 1900 hours on it. I also checked that the radiator didn't have anything blocking it and the coolant recovery tank has the proper level in it. When it shut down I opened the side panel and it was definitely hot. This then rules out a faulty water temperature sending unit in my mind. I started the unit and the fan turns and it doesn't sound like the belt is slipping. I put the cover back on and I can feel air being push out he back end, however after a 1/2 hour or so the housing in the back area was getting hot to the touch. From what I can find the shut down temp is 230°F. The max running temp should be 104°F over the ambient temp. It was 70° last night and I had check the hose temp at around 185°F. Just wondering if anyone else has seen this issue. I'm trying to decide my next steps. I'm thinking about replacing the belt. It could be old and glazed and not driving properly. Do I replace the belt only or do I do the thermostat and water pump while I'm at it. Link to comment Share on other sites More sharing options...
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