Transmission overheating? - JeepForum.com
 
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post #1 of 7 Old 08-19-2019, 09:36 PM Thread Starter
parisjeepcanada
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Transmission overheating?

I have a 2014 Grand Cherokee Summit with the 3.6L V6, with about 80k miles.

When I drive around the city for an hour or so, the transmission temperature is reaching 215F. On the highway it's a little better at around 212F. No towing or anything like that.

a) Is this abnormal?
b) If so, what could be the problem?

Thank you!

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post #2 of 7 Old 08-20-2019, 09:06 AM
Jurassic_Jeep
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212 F is a bit warm, you want to be under 200 F or 95oC as I just recently went through this myself and problem seems to be solved. Check out my posts in this thread.

https://www.jeepforum.com/forum/f309...ghway-4356733/

2014 Jeep Grand Cherokee Summit 4x4 3.6L V6.
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post #3 of 7 Old 08-20-2019, 02:43 PM Thread Starter
parisjeepcanada
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Interestingly I call the dealership and they said it is normal and that’s light would go off if the transmission was actually overheating. Also, when I start the car in the morning, the transmission temperature is 5-6C higher than the outside temperature. Thoughts?
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post #4 of 7 Old 08-20-2019, 03:22 PM
ColdCase
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Trans temp sensor off by 6 degrees, bad connection.

Some people think I'm stupid and I totally disagree. But my biggest fear is that me thinking I'm smart proves them right.....
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #5 of 7 Old 08-20-2019, 03:44 PM
Bilko
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Is this the 5 or 8 speed? Mine is the 5 Speed and the temperature is usually 167F even when its 90F outside. It only goes up if I am driving hard up the mountains and even then I have never seen it higher than 200F.

There is a bypass valve in the pipes that connect the AT cooler to the transmission, this works in the same way as the thermostat in the engine cooling. It recirculates the fluid without going through the cooler until it reaches the optimum temperature at which point opens so the fluid passes through the cooler. I am assuming that this opens at ~167F because the temp increases to this point then stabilizes.

I am assuming that even if you have the 8 speed it will operate in a similar way. You can buy just the bypass valve. If you go to a dealer they will probably change the the pipes & valve assembly because its quicker to change than trying to disconnect and replace just the valve.
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post #6 of 7 Old 08-21-2019, 06:31 AM
Jurassic_Jeep
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It probably has not had time to cool down, depending on the ambient temperature. Check your engine oil temperature, that should be about the same as the transmission oil when you first start it up (first few seconds).

I would monitor the temperature on long road trips at highway/freeway speeds, like more than 2 hrs. More than 100 oC might still be within the range of the oil (its hydraulic), but definitely not where it should be for normal operating conditions.

Quote:
Originally Posted by parisjeepcanada View Post
Interestingly I call the dealership and they said it is normal and that’️s light would go off if the transmission was actually overheating. Also, when I start the car in the morning, the transmission temperature is 5-6C higher than the outside temperature. Thoughts?

2014 Jeep Grand Cherokee Summit 4x4 3.6L V6.
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post #7 of 7 Old 08-21-2019, 07:30 AM
2008OverlandCRD
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Mine is a 2017 Summit Hemi 4x4. Once the transmission warms up it runs at 195 almost no matter how I drive.
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