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Open Roads Forum  >  Class C Motorhomes

 > Transmission cooler

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Mile-High-Endura

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Posted: 08/19/12 08:40am Link  |  Print  |  Notify Moderator

Has anyone added an auxilary cooler? Did you use a kit? Mine has only the cooler in the radiator and I want to add one. My temps aren't terrible ( 190-210)but I'd like to lower them anyway. I have seen as high as 230 pulling the Jeep up some very steep mountain roads. Thanks.

Jeff


2005 Gulf Stream Endura 6340 8.1 gas
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crasster

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Posted: 08/19/12 08:42am Link  |  Print  |  Notify Moderator

Absolutely. We use a smaller one we bought from autozone to keep things cooler. It's especially good in the summer going up mountain grades.


4 whopping cylinders on Toyota RV's. Talk about great getting good MPG. Also I have a very light foot on the pedal. I followed some MPG advice on Livingpress.com and I now get 22 MPG! Not bad for a home on wheels.


wolfe10

Texas

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Posted: 08/19/12 08:52am Link  |  Print  |  Notify Moderator

Good idea.

The system I like best is an auxiliary cooler BEFORE the in-radiator cooler and out of the radiator's air stream if possible.

Leave the in-radiator cooler, as it also WARMS the fluid in cold temperatures. Cover the auxiliary cooler in the winter.

This keeps it cooler in the summer and lessens the heat rejection load on the radiator. It also allows properly warmed fluid in the winter.


Brett Wolfe
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ronfisherman

SE Michigan

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Posted: 08/19/12 01:52pm Link  |  Print  |  Notify Moderator

My Kodiak came from factory with the auxiliary transmission cooler.
Here is a link for a place to order the parts. Auxiliary transmission cooler
The temperatures you are getting are about what mine has read in the mountains.


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Ductape Dave

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Posted: 08/19/12 03:09pm Link  |  Print  |  Notify Moderator

When I had my class A I installed a trans cooler and fan. I had the fan on a switch so I could control it. Mainly had the fan on in hot weather and sitting in traffic. Number 1 trans failures are from fluid overheating.

ronfisherman

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Posted: 08/19/12 03:24pm Link  |  Print  |  Notify Moderator

I forgot to mention. The Allison transmission can run hot if over filled. When trans oil is warm (above 165 degrees) check dip stick. The fluid level should be at the bottom to just above the bottom line of the "hot" marks on the stick.

Gale Hawkins

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Posted: 08/19/12 03:48pm Link  |  Print  |  Notify Moderator

When was the last time you pumped out the old ATF and refilled with new synthetic ATF?

ronfisherman

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Posted: 08/20/12 05:03am Link  |  Print  |  Notify Moderator

Never pump out the oil in a Allison 1000 Transmission.
Per Allison,DRAIN IT.

az99

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Posted: 08/20/12 06:53am Link  |  Print  |  Notify Moderator

ronfisherman wrote:

I forgot to mention. The Allison transmission can run hot if over filled.


Please explain what causes it to run hot from too much fluid.

ronfisherman

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Posted: 08/20/12 05:20pm Link  |  Print  |  Notify Moderator

Not real sure. When the oil level is to high it starts to foam. Then will not cool properly. Very common fix over on DP. The Kodiak transmission is the same as pickups. Except Kodiak's have a deeper pan and different internal filter for the added depth of pan.

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