2006 Dynasty ISL-400 Transmission Cooling Question

[Dr4Film]

I have been prepping the coach and engine for our departure from our Workamping jobs at Totem Pole Park traveling to my brother's farm in Dansville NY.

I topped off the coolant reservoir, check the engine oil level, will check the transmission level once we are on the road even though there is a dipstick at the rear. I trust the keypad testing procedure more so than the dipstick.

I finally put eyes onto the two new transmission hoses that I had installed just before leaving Florida. They are attached to the top of a long rectangle container on the drivers side of the engine. One hose attached at one end and the second attached at the other end, both on the top. There is also a large coolant hose coming from the coolant reservoir attached to one end and the other end has a coolant hose going over to the side radiator.

Is that rectangle container the actual transmission cooler inside which transfers heat from the transmission fluid to the coolant then goes over to the coolant condenser on the side where it dissipates the heat from both the engine and the transmission?

If so, then this configuration is very different than the Windsor where its radiator was built with a small area on one end just for the transmission. Obviously, the largest area of the radiator was for cooling the engine coolant.

Thanks for any clarification. I am always learning new stuff with this Dynasty.

[Ivan K]

Appears to me that it is to warm the tranny fluid up to operating temp on startup, not a bad thing. That's what the tranny lines inside a radiator do too, not just cooling.

[Frank McElroy]

8 hours ago, Dr4Film said:

I have been prepping the coach and engine for our departure from our Workamping jobs at Totem Pole Park traveling to my brother's farm in Dansville NY.

I topped off the coolant reservoir, check the engine oil level, will check the transmission level once we are on the road even though there is a dipstick at the rear. I trust the keypad testing procedure more so than the dipstick.

I finally put eyes onto the two new transmission hoses that I had installed just before leaving Florida. They are attached to the top of a long rectangle container on the drivers side of the engine. One hose attached at one end and the second attached at the other end, both on the top. There is also a large coolant hose coming from the coolant reservoir attached to one end and the other end has a coolant hose going over to the side radiator.

Is that rectangle container the actual transmission cooler inside which transfers heat from the transmission fluid to the coolant then goes over to the coolant condenser on the side where it dissipates the heat from both the engine and the transmission?

If so, then this configuration is very different than the Windsor where its radiator was built with a small area on one end just for the transmission. Obviously, the largest area of the radiator was for cooling the engine coolant.

Thanks for any clarification. I am always learning new stuff with this Dynasty.

Yes, that is your transmission heat exchanger.  Works like the oil cooler inside the block of the ISL.  Both are cooled and oil temps maintained at near the same temp as your engine coolant. 

[Dr4Film]

Thanks, Frank!

Now I understand why the engine and transmission temps are so close together in the ISL-400 versus what I was accustomed to with the Windsor and its ISC-350.

You have been very helpful in my learning journey with the ISL-400.