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Old 03-18-2015, 05:28 PM   #1
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Belt & Hoses Replacement Cost

Hi All:

I want to replace the belts and hoses on my 2008 Monaco Diplomat with 55K miles.

It has a Cummins 400 ISL with a rear radiator.

I would really appreciate knowing what cost I should expect for this work.

Many thanks.

Jeff T.
2008 Diplomat 40 PDQ
txturner@gvtc.com
Fair Oaks Ranch, Texas
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Old 03-18-2015, 06:14 PM   #2
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There are a lot of hoses that should be checked and if needed be replaced which will effect the cost a lot. The heater hoses can be a big project if they also need replacement. Just did hoses and belts on ISM 500 and the hoses and belts were almost 200$ not including heaters and 1/4 vent hoses. It was a 5 hour project which would equal about 500$. I would thing you are looking at 500 to 650$. Do do it so you aren't broke down or damage engine.
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Old 03-21-2015, 08:59 AM   #3
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Thanks, Tom, for the response. I'm looking specifically for info from people with rear radiator coaches.
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Old 03-21-2015, 11:20 PM   #4
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"TXTURNER"....I changed mine on my 05 Diplomat 400 ISL myself. You didn't say if you're doing it yourself or having it done. I didn't want to chase all the special hoses and I wanted to convert to silicone because I was looking to reduce the stress the hoses were putting on the radiator.....a radiator mounting issue with Monaco. The silicone hoses flex more readily. I had a leaky radiator that I had to replace because it was too rigidly mounted.

Here's what I did. I looked at the hoses and determined, for example, the lower radiator hose was 12" with a 90 degree bend and 6" more of straight hose. I was able to go to a website and buy several hoses that fell into the sizes I needed and some had extra inches on them that were used where short straight pieces were needed. I ordered the hoses and did the change myself. I know this doesn't help you much, but here are some of the hoses you need to change....I would leave the heater hoses alone. You have upper and lower radiator hoses. A short hose on top for the thermostat. The radiator hoses, underneath are plumbed into and out of your trans cooler, so there are two more hoses there.

On your coolant tank, there are two small hoses, that run over to the turbo and back. Those should be changed. There us also one large hose under the coolant tank, odd size straight piece that Napa sells.

I'm guessing if you pay to have it done, probably about 4-5 hours of labor, plus coolant and hoses.
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Old 03-21-2015, 11:31 PM   #5
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Just be sure if you go to silicone hoes that you DON'T use a coolant with sodium 2-ethyl hexonate. This is an acid that can eat the hoses and clog the radiator. Cummins ran into it on some ISL's in trucks.
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Old 03-23-2015, 07:40 AM   #6
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Many thanks, Dutch Star Don & Mr-D, for the very helpful info!
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