2005 auto trans temp in pan

[Jeepr]

I've got an 05 with auto and a mag hytech deep pan with probe in it. I could have sworn that it usually runs like 160-170 in normal driving (not towing). I thought I used to hit near 200 towing in the mountains. But, lately I've noticed it near 200 in daily driving. Tonight it was 197-200 just driving about 15 miles home on I-44 from downtown (and it was 18 degrees outside).



Seems a bit hot for flat highway or even some city streets doesn't it?

 

[Hoefler]

The 05's have 2 transmission coolers, one is cooled by engine coolant and the second is the cooler in front of the radiator. The coolant heat exchanger does work as a heater as well. If you are running a winter front of some kind, the air heat exchanger in front of the radiator will not be very effective, if at all. Sense the coolant heat exchanger is first, it can heat the fluid and the air heat exchanger will have literally no affect.

 

[Adubya]

Wow that runs really hot. My 03 with a Mag-Hytec might break 140 if im lucky but never goes over 110 just driving around town.

 

[DNDracing]

I have similar temps to Adubya, see around 125 right now (Michigan winter, with a grill cover). Runs about 130-140 in the summer. Even pulling 11K race car trailer, I rarely see any prolonged temps above 150 may peak at 180 in stop and go driving.

I mounted the sensor inline on the feed line to the trans cooler coming out of the pan, not sure how that would affect the measurement vs. a probe in the pan?

http://www.dieselmanor.com/dm_products/DM-CLG3.asp

I would be concerned the trans is eating something up, especially since you have a "normal" operating range and are now seeing temps above that. Regardless of what numerical value you have (which will vary dependent on mounting location, gauge maker, wire length, etc), if you know what normal is for your set up, and you are now above that, might mean something is wrong?

Good luck!!!

 

[AH64ID]

Have you checked the fluid level?

 

[Jeepr]

Did some more looking just now. Fluid level is fine, still nice and red (it's Royal Purple) and I don't detect any smell of burnt fluid. I hit the pan with an infrared temp gauge, which I know isn't exactly scientific, and it was only reading like 140. So, I wonder if my pyro in the pan is just wacky?

Oh, and Hoefler, good information about the 2 forms of cooling, I wasn't aware of that. But, I'm not running any kind of block in the front, and engine temps are normal.

 

[RDeFayette]

all 3rd gens with automatics have the 2 coolers.

2 other possible areas for high trans temps.

1st one will increase fluid flow if nothing else.

check /modify/fix.

check valve in the trans cooler line.

http://www.cumminsforum.com/forum/3rd-gen-powertrain/433016-48re-check-ball-valve-removal.html

And trans cooler T. stat

http://www.cumminsforum.com/forum/3...ssion-overheating-issue-48re-running-hot.html

 

[cerberusiam]

The IR gun is only useful for surface temp not the actual sump temp. As long as the fluid is moving it is likely a lot warmer wher ethe probe is than what is radiating.

200 driving at road speed in those temps is high. Maybe not if you wer edoing a lot of stop and go, depends on your driving characteristics. If you have a plug on the temp sensor line check it for contact and clean it. High resistance on the plug will make some gauges read higher than normal. Otherwise, as was posted the drain back check ball might be a problem. The thermostat might be an issue if it is stuck open.

 

[p-Bar]

Bob D thanks for the info . I am running mine sending unit in the hot side my transmission guy says I should be doing it in the sump but I wanna know if i am cooking off my fluid . I will be checking the transmission T-stat.

 

[Jeepr]

Wow, thanks guys! I assumed high temps meant it was slipping and thus one foot in the grave. But, you've given me some hope that it's just a cooling problem. cerberusiam - one thing that's odd is mine has never gotten hot in city driving, no more so than highway. The only times it ever seemed to break a sweat was towing in the mountains.

 

[NIsaacs]

If you are using teflon tape as a sealer on the threads of the sender it might have an intermittent ground.



Nick

 

[Jeepr]

Just an update on this. I've not looked into it any further, because both times it did this, the outdoor temps were in like the single digits. I've watched it when the outdoor temps are a bit more normal and the trans temps are back to normal. The IR gun on the outside of the pan is about the same, leading me to believe it's probably the sending unit or wiring that is causing false readings when it's really cold out. I suppose some part of the trans cooler could be incorrectly bypassing, but seems unlikely.