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Old 09-25-2015, 03:40 PM   #15
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PeterH-Airstreamer's Avatar

1997 30' Excella
1983 31' Airstream310
Austin , Texas
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Originally Posted by wizz22789 View Post
Is the radiator new or rebuilt? I would worry more about oil from the cooler leaking into the radiator and water leaking into the transmission fluid. Transmissions are very expensive.
Start twisting the old lines and who knows what you loosen? i WOULD GO WITH A SEPARATE TRANSMISSION COOLER AND NEW LINES
That will have to be a worry for another day. I replaced the Engine Oil cooling lines. My radiator is huge and has 3 cooling reservoirs, water, tranny fluid and Engine oil. That should make a fine mixture if it ever starts leaking internally

1983 310 Classic Motorhome
1997 30' Excella Trailer
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Old 09-25-2015, 04:02 PM   #16
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1974 20' Argosy 20
Richmond , Kentucky
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My 74 Argosy only has the transmission cooler as part of the radiator. I'm opting to eliminate the transmission cooler aspect and just add bigger external cooling units for both the engine and the transmission.

To me it's a matter of not wanting to tempt fate

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1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
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Old 09-25-2015, 04:18 PM   #17
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1981 31' Excella II
New Market , Alabama
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It is also not good to run the transmission too cold. Friction is higher and water can collect in the fluid because it does not get hot enough. There is nothing wrong with trans coolers in the bottom of the radiator. If you live in a hot climate and tow with it, then you might consider an external cooler. I would still put it in series with the one in the radiator. The radiator cooler will still provide some cooling when you are idling or trying to park a trailer when there is not that much airflow going through an external cooler. My 2000 Excursion came with an external cooler only and in later models they put it in series with the radiator. I don't have a radiator cooler at all so I don't have that option. You could put a temp gage on it and see if there a problem before you start trying to fix a non-problem.


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