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Old 10-27-2021, 02:05 PM   #1
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Onan 12500 radiator replacement

Has anyone had experience with radiator replacement in a 2001 Monaco Sig
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Old 10-28-2021, 05:35 PM   #2
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Quote:
Originally Posted by Ramjet2 View Post
Has anyone had experience with radiator replacement in a 2001 Monaco Sig
Sorry no experience with your gen but you might be able to find the service manual here;


http://www.skilledcrafting.com/onanfiles/

If you run into a problem not covered by the SM the guys over at smokstak.com are quite helpful

Good luck
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Old 10-28-2021, 06:31 PM   #3
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I looked closely at the radiator. It looks like a small automotive radiator with black plastic tanks and aluminum center section.

I'd take some careful measurements and find a friendly NAPA or maybe a radiator shop that can find the proper one.
You could also have the old one rebuilt.
If you order it from Cummins it will cost a fortune and probably go on back order

Please check back and let us know how it works out?
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Old 10-28-2021, 07:15 PM   #4
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I don't know your model. Mine has access on the curbside but if I remember right the generator has to be lifted to allow access past the motorhome generator slide out framework. I changed the hoses and flushed it real good but didn't have to remove the radiator.
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Old 10-28-2021, 07:53 PM   #5
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Onan Radiator

Quote:
Originally Posted by Ramjet2 View Post
Has anyone had experience with radiator replacement in a 2001 Monaco Sig
I have an '04 Sig that I replaced the radiator on the 12.5 unit. I found that the radiator in it had a VW Modine radiator in it from a 1979 VW Rabbit diesel! I replaced it in 2016 for $59.00 delivered. It was a perfect fit with very minor modifications.
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Old 10-28-2021, 10:39 PM   #6
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Wow $60 Rad for Onan that's a gem .If it fits his too you win the post/answer of the day award.
That what's makes this place so great.
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Originally Posted by thedoktor View Post
I have an '04 Sig that I replaced the radiator on the 12.5 unit. I found that the radiator in it had a VW Modine radiator in it from a 1979 VW Rabbit diesel! I replaced it in 2016 for $59.00 delivered. It was a perfect fit with very minor modifications.
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