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Old 09-15-2020, 05:13 PM   #15
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Originally Posted by vettenuts View Post
If you are currently stopped, do a fluid cold check before moving again. Procedure is in the Allison manual or you can download.
Interesting...I've never heard of the cold fluid check on an Allison 1000 transmission.

Always checked it when it's hot.
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Old 09-15-2020, 05:26 PM   #16
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I have had my high temp warning come up 3 times. Allways when I was working it hard, so understandable.

It sounds like you got a false warning. Possibly a bad sender or wiring problem.

Do you have an infrared heat thermometer? If not, pick one up at a tool shop, and take the temp of your trans. next time out on the road. Check it as soon as possible after you stop.

Here's one on Amazon, but you can get them at most hardware stores......


If you have the 5 speed Allison, you can monitor the trans. temp with a ScanGauge II.

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Old 09-15-2020, 05:44 PM   #17
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Originally Posted by Arch Hoagland View Post
Interesting...I've never heard of the cold fluid check on an Allison 1000 transmission.

Always checked it when it's hot.

The hot check provides the definitive check of fluid level, the cold check verifies the level is adequate to be driven such that the hot check can be conducted once an adequate temperature has been obtained. I just figured if the coach is currently level he can do the cold check to ensure the fluid level is adequate for driving.
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Old 09-17-2020, 11:40 AM   #18
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Thanks for your reply. New development: Checked the fluid cold (Is ok) checked the coolant (is ok). Drove the RF for 10 miles, no message on display. Did a hot fluid check, is OK. Then, I turned the engine off. Few minutes later turned the key to on position to level the coach and here it was, the message again.
Could it be a hard code by now? I cannot imagine that the transmission is so hot after 10 miles flat driving with no load. Outside temp is 78 degrees.
Thanks for your help.
I will pick up a scangauge II asap.
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Old 09-18-2020, 08:50 AM   #19
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Disconnect the chassis battery ground cable for a minute or so, then reconnect. This may erase the message. Ten minutes of driving flat road at 78 degrees outside temp should not overheat your trans. Worth a try. Under the conditions you describe, my 2004 Allison 5 speed in a motorhome very similar to yours, would be running in the 145 to 150 degree range on the Scangauge II.
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