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Old 09-13-2020, 05:34 PM   #1
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Allison 1000, check transmission temp warning

Hello
I have a 2003 Adventurer 33V, W22 chassis, Allison 1000, 8.1
Today, just as I parked in the campground, the check trans temp warning appeared. I was driving for 2 hours, flat terrain, no toad, 81 degrees outside temp.
Now after 3 hours of cool down, the message is gone.
I checked the trans fluid, it's ok. The coolant temperature was fine.
What could be the problem?
Is there a temperature sensor that could be bad?
I'm on a 5000 miles trip, 3500 miles in w/o any problems.
Should I drive it to see if the message comes back?
Do I have to worry and loose sleep over this?
Any help is appreciated.
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Old 09-13-2020, 11:35 PM   #2
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Has the transmission fluid ever been changed?

By now you should have changed the transmission fluid at least three times. And the spin on filter at least once.

It came with Dexron iii in it and they recommend changing it every two years or 25,000 miles.
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Old 09-14-2020, 05:16 AM   #3
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I have never had that happen but I use a ultragauge scan tool so I can monitor trans temp and almost any other engine parameter.

UltraGauge OBDII Scan tool & Information Center
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Old 09-14-2020, 02:21 PM   #4
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I purchased this unit with 52000 miles on it. Changed all fluids and filters then. Have now 55500 on it. 3500 continues miles, no problems even when towing and up the hill.
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Old 09-14-2020, 02:39 PM   #5
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What transmission fluid did you use?
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Old 09-14-2020, 05:14 PM   #6
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Arch, this is one of the maintenance I never think about. We've had our motorhome for 3 years. Have not changed fluid or filter since and have added about 20,000 miles. An Allison website says for other than severe duty, fluid every 4 years and filter every 2. So it looks like I need to get the filter in pretty soon. Have never done it on any vehicle. How difficult is changing the filter?
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Old 09-14-2020, 05:32 PM   #7
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Quote:
Originally Posted by garyb1st View Post
Arch, this is one of the maintenance I never think about. We've had our motorhome for 3 years. Have not changed fluid or filter since and have added about 20,000 miles. An Allison website says for other than severe duty, fluid every 4 years and filter every 2. So it looks like I need to get the filter in pretty soon. Have never done it on any vehicle. How difficult is changing the filter?
The filter is a spin-on filter and very easy to change. Hangs down and is located about a foot from the engine spin-on filter.

It's orange and has a magnet at the base which needs to go to the new filter.

I buy my filter at the local Allison dealer...I've got a phobia about counterfeit oil filters and transmission filters.

I believe your year W22 came with Transynd but not sure about that.

You need to drain your fluid, very easy it's exactly like draining your engine oil.

Drain into a pail that has quart markings on the side and then replace with the exact same amount that drained out. Install the new spin-on filter at that time.

You will get about 10 or 11 quarts depending on how long you wait. I drain mine overnight.

Drive about 20 miles and then drain and refill again. A couple quarts stay in the torque converter and that's why you have to do it twice.

DO NOT do a power flush! Allison says that is bad.

Use Transynd or any TES295 transmission fluid only.
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Old 09-14-2020, 05:53 PM   #8
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If you are currently stopped, do a fluid cold check before moving again. Procedure is in the Allison manual or you can download.
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Old 09-14-2020, 06:20 PM   #9
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Thanks for the replies. The transmission failed and was replaced in 2016 by the previous owner. So not sure if it was a different model. I have the receipt so can check if that's important. I was hoping to just change the filter. If I have to drain the fluid I may have it done. I don't really have a good place to do it at the house. While we've owned it for 3 years, we've only put on 1000 miles this past year so probably not an urgent need. The Covid and all the newbies out and about have us hunkered down. I'm going to look tomorrow to check how accessible it is. My 77 year old bones may not be up to the task.
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Old 09-15-2020, 05:58 AM   #10
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Kendall Classic ATF. Replacement for OEM Dexron 3
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Old 09-15-2020, 06:11 AM   #11
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Quote:
Originally Posted by frnu View Post
Kendall Classic ATF. Replacement for OEM Dexron 3


I don’t see that listed on the Allison website for meeting TES-389 for Dextron.
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Old 09-15-2020, 09:08 AM   #12
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frnu,

Check the transmission cooler for cleanliness or obstructions, (road debris, leaves, dead birds etc.) clean with strong water stream if necessary. It is located in front of engine radiator. I would just keep an eye on the instrument cluster and continue your journey tomorrow.
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Old 09-15-2020, 12:27 PM   #13
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OK, I will do a cold fluid level check and if ok, continue the travels and keep an eye on the instrument cluster in case the warning comes up again. Thanks for all your help.
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Old 09-15-2020, 01:55 PM   #14
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I second the trans cooler thoughts.
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