Transmission Over Temp, already replaced a lot - JeepForum.com
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post #1 of 21 Old 05-26-2015, 04:12 PM Thread Starter
ztyson89
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Transmission Over Temp, already replaced a lot

Okay, so here's my dilemma, I have a 2006 GC 3.7l 2wd that has given me the "Transmission Over Temp" code. It started while sitting in the bank drive through. The on-dash temp gauge rose to almost red before giving the code. Drove it to cool down some and shut it off.
1. Replaced the thermostat, new coolant, bled all air out of coolant system
Tried that out, within 5 miles, the on-dash temp gauge gets close to red and the same code appeared again, Transmission Over Temp.
2. Serviced transmission: replaced fluids, replaced filter
Tried that out, again, within 5 miles, same temp problem and same trans temp code. Took it to a buddy's shop and asked for his opinion, he said that there was a small leak on the bottom side of the water pump and recommended a new radiator.
3. Replaced water pump and replaced radiator, replaced coolant and bled all air out of the coolant system.
Hoping third time was a charm, I tried that. To no avail, the exact same issue occurred again, on-dash temp gauge gets close to red and throws the Transmission Over Temp code within 5 miles of driving. I am close to taking a baseball bat to it from frustration. Does anybody have any ideas about how to fix this or where to go from here because I'm at a loss? Any help is greatly appreciated.

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post #2 of 21 Old 05-26-2015, 04:17 PM
colinzj
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That the engine and the transmission are both overheating would tend to suggest some issue with the cooling system. Is the fan running normally? Is the fan running at both speeds?

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post #3 of 21 Old 05-26-2015, 04:18 PM Thread Starter
ztyson89
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Could that be causing the on-dash temp to rise like it is?
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post #4 of 21 Old 05-26-2015, 04:23 PM Thread Starter
ztyson89
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The fan turns on once it reaches "half way" on the temp gauge. Idk what the actual temp would be. The fan seems to be running fine.
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post #5 of 21 Old 05-26-2015, 04:25 PM Thread Starter
ztyson89
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And that was my initial thought considering the temp rising like it is, but having replaced said parts, I don't know how it could continue to do what it's doing.
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post #6 of 21 Old 05-26-2015, 04:44 PM Thread Starter
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Guys, I'm at a loss here, anybody have any ideas?
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post #7 of 21 Old 05-26-2015, 06:19 PM
colinzj
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Is this happening in all gears at all speeds?
Has the coolant ever actually boiled over?
How's the heater output when it's "overheating"?

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1993 ZJ Laredo 4x4 4.0L Dead, sold, and rolling again
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post #8 of 21 Old 05-26-2015, 06:39 PM Thread Starter
ztyson89
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Yes, all speeds. But for some reason, it seems to climb a bit slower when driving at slower speeds. It has never boiled over. And the heater/defrost is just as hot as before. No abnormal temperature spikes or drops.

Last edited by ztyson89; 05-26-2015 at 06:39 PM.
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post #9 of 21 Old 05-26-2015, 10:40 PM
JakeWK
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There is a temp sensor in the solenoid pack. This sensor goes bad a lot, and causes the Trans OT message. It's common, check more around this forum. The only thing is, it doesn't explain your temp gauge going up, which indicates an actual overtemp.. I'd say check the thermostat again, and look into the tranny temp sensor.. Keep us posted man good luck

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post #10 of 21 Old 05-26-2015, 11:21 PM Thread Starter
ztyson89
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Thanks JakeWK, I'll take your advice and check the thermostat, even though it's brand new, we all know brand new doesn't always mean functional hah. But I'll verrify it functioning and look into the temp sensor. Would you happen to know how invasive it's going to be to get to that sensor? Or is it going to be decently easy by dropping the pan and it pretty much being right there? Bc I'll be straightforward, I'm no trans expert and I'm not too comfortable working with the ball bearings and all those small parts that make the trans go, just kinda leery about it if you get what I'm saying.
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post #11 of 21 Old 05-27-2015, 02:41 AM
JKM
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Are you sure your cooling fan (radiator fan) is coming on?
Did you take out all the air in the system using the bled screw with the heater on full speed? Bleeding through radiator cap does not work on these.
Are you sure thermostat is installed correctly?
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post #12 of 21 Old 05-27-2015, 10:30 AM Thread Starter
ztyson89
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Yea, I'm sure the fan is coming on, unless my eyes are deceiving me, I bled all the air out of the 8mm Allen set screw right beside the alternator, with the defrost heat on full blast, until there was no bubbles, only coolant coming out. And I installed the new thermostat the exact way the old one came out with the small ball bearing pass through port on the top I believe, I cannot remember which way it was at this moment, but I installed it the exact way the old one came out. But I will do some research into proper thermostat installation and just verrify that it is correct.

Last edited by ztyson89; 05-27-2015 at 10:35 AM.
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post #13 of 21 Old 05-31-2015, 06:15 PM Thread Starter
ztyson89
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Well, for all that have contributed, here is the latest update: I had a mechanic buddy take a look at it and through some testing, we found out that the Jeep has a blown head gasket. Let's pray that the damage isn't too bad to the internals and that the heads are not warped/need to be machined.

If you're interested, let me know and I will keep this post going and update it with pictures as I go. If not, then I'd say that this will be the conclusion. Either way, I'd like to thank all of you who have submitted suggestions thus far and wish you all the best of luck and plenty of adventures to come. But like I said, if you would like for me to continue this thread, let me know and I will. And again, thanks guys!
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post #14 of 21 Old 06-01-2015, 06:17 PM
nighowl2000
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3.7's are pretty tough...you might be lucky

mine: 2014 jku sport S

her's: 2010 commander sport 3.7L 4x4
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post #15 of 21 Old 06-02-2015, 05:26 PM
tom19511
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Yes, keep updating this thread. Thanks.

Tom

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