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Old 11-14-2014, 01:09 PM   #1
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Replacing antifreeze and radiator hoses on Dutch Star

Coach is FL chassis and CAT engine. Need to replace the coolant and 14yr old hoses at the same time. Couple questions.....where do I find the cooling system capacity for my coach? Called FL and they seem to be struggling to find the upper / lower radiator hose part numbers. They did give me numbers but the descriptions don't seem to match up to what I have. Anyone have any luck getting these from somewhere other than FL? Lastly are there any other drain valves besides the one I see on the bottom of the radiator? Thanks.

Craig
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Old 11-14-2014, 04:42 PM   #2
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Craig......I had to replace the radiator in my 2005 Monaco Diplomat. I also wanted to change the hoses and new it would be a pain to locate the various ones connected to the radiator and trans cooler. I also wanted to eliminate some stress caused by standard hoses that partially caused my radiator to crack.


I went with flexible silicone hoses. Since mine were all 2", I went online and found a supplier of silicone hoses. They come in various lengths, such as a 90 degree turn with 6" of hose on one side and 24" on the other. I mapped out/measured what I needed...for example, I needed a 90" degree turn with 6" on one end and 12" on the other end. I also needed a 10" straight piece. So, I bought the hose with the 90 degree turn with a 6" length on one end and 24" on the other. I cut the one end down and made two hoses. This sounds complicated, but is pretty easy. I was able to do all the hoses with about six pieces.


You really only need a guesstimate at what your coach holds. You should be replacing the old coolant with the new Organic Acid Technology (OAT) coolant (in all new coaches). It doesn't require SCA's, DCA's, which eliminates testing. You may have a coolant filter, which typically contains SCA's or DCA's. You need to replace it with a BLANK coolant filter.


Once you flush the system, making sure the heater is on and the core is flushed, just refill the unit. Typically about one to two gallons of water will be trapped in the system. If you add two gallons of OAT concentrate (several brands) and then fill the rest with a 50/50 premix, you should come pretty close to a 50/50 mixture.
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Old 11-14-2014, 06:07 PM   #3
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Quote:
Originally Posted by Dutch Star Don View Post
Craig......I had to replace the radiator in my 2005 Monaco Diplomat. I also wanted to change the hoses and new it would be a pain to locate the various ones connected to the radiator and trans cooler. I also wanted to eliminate some stress caused by standard hoses that partially caused my radiator to crack.


I went with flexible silicone hoses. Since mine were all 2", I went online and found a supplier of silicone hoses. They come in various lengths, such as a 90 degree turn with 6" of hose on one side and 24" on the other. I mapped out/measured what I needed...for example, I needed a 90" degree turn with 6" on one end and 12" on the other end. I also needed a 10" straight piece. So, I bought the hose with the 90 degree turn with a 6" length on one end and 24" on the other. I cut the one end down and made two hoses. This sounds complicated, but is pretty easy. I was able to do all the hoses with about six pieces.


You really only need a guesstimate at what your coach holds. You should be replacing the old coolant with the new Organic Acid Technology (OAT) coolant (in all new coaches). It doesn't require SCA's, DCA's, which eliminates testing. You may have a coolant filter, which typically contains SCA's or DCA's. You need to replace it with a BLANK coolant filter.


Once you flush the system, making sure the heater is on and the core is flushed, just refill the unit. Typically about one to two gallons of water will be trapped in the system. If you add two gallons of OAT concentrate (several brands) and then fill the rest with a 50/50 premix, you should come pretty close to a 50/50 mixture.
Don

Did you use any factory hoses at all or did you make ALL of them with the silicone hose you purchased and cut? Replacing all my hoses is on my list and this sounds interesting.
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Old 11-14-2014, 06:21 PM   #4
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Thanks for the ideas Don. I'll look into that. For now I'm going back with the coolant that's in it which is the CAT extended life coolant. I don't think it's that old because it looks clean but the mix is weak at only -10* freeze protection.
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Old 11-14-2014, 10:20 PM   #5
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I was going to post what I have on coolant but that's for a Spartan/Cummins. Spartan gave me all the part numbers and I ordered the silicon ones. FL should be able to do the same I would hope.
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Old 11-15-2014, 10:42 AM   #6
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"noserider".....On the Monacos, the charge air cooler sits atop the radiator instead of stacked in front of each other. The radiator was very rigidly mounted and was susceptible to a lot of stress when the engine moved. I wanted the softer hoses to absorb some of that stress.


I didn't change my heater hoses, but changed all of the 2" radiator hoses. The Cummins has a short 6" hose on the thermostat, the longer upper and lower radiator hose, a water pump bypass hose and sectioned hoses that went from the radiator to the trans cooler and back.


Even though there were several hoses, it was pretty easy to identify what I needed and then select the hoses from the website. As I said, several hoses were cut and used two make two hoses.


It was years ago, so I'm not sure what store I bought them from, but this looks familiar. As you can see you can get any shape and size.

Silicone Hose | Silicone Vacuum Hose | Silicone Radiator Hose - Flex Technologies
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