"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.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab