Jeep Garage  - Jeep Forum banner
1 - 17 of 17 Posts

·
Registered
Joined
·
1,337 Posts
Discussion Starter · #1 ·
I have noticed that the trans temp on my new 2014 runs 190 to 200 after fully warmed up (15 or more miles of driving). This is 20 or 30 degrees warmer that my 2012 ran. I think it is due to the heat exchanger the new trans has to make it more efficient. I have 2 questions. What trans fluid temps are others seeing? I also have to wonder because this is a fill for life trans what kind of fluid is this? I have always understood that the warmer the fluid runs the quicker it breaks down.
 

·
Premium Member
2017 Summit
Joined
·
8,884 Posts
I don't remember the numbers, but it runs right about midpoint on the gauge. That is usually the sweet spot if the right gauges are used.

I confess that knowing the number would do me no good since I don't know what it should be. I think this is my first vehicle that shows this.


---
 

·
The Negotiator
Joined
·
5,364 Posts
Padgot had the same thing when he got his jeep as well, might want to ask him. I don't it was ever a problem though
 

·
Registered
Joined
·
1,337 Posts
Discussion Starter · #4 ·
I don't remember the numbers, but it runs right about midpoint on the gauge. That is usually the sweet spot if the right gauges are used.

I confess that knowing the number would do me no good since I don't know what it should be. I think this is my first vehicle that shows this.


---
Mine is a little past midpoint on the gauge. It takes it a while to get there probably 15 miles or so. It seems its set to cool at 200 because if I'm stuck in traffic the temp will rise to 200 and then fall to about 188 or 190 and cycle back and forth in that range. It is warmer than what I have seen in my last 2012 Grand Cherokee which was usually in the 170 range. I did read an article about the Ram with this trans that said they were using hot engine coolant to warm the trans fluid for more efficient operation but I was just wondering what the long term effect on the fluid is.
 

·
Registered
Joined
·
1,973 Posts
My previous 2012 Overland V8 trans temp was usually about 160. But my 2014 Summit V8 runs about 210. Quite a difference. It wouldn't surprise me if both readings were inaccurate.

I notice on my 2014, even when it sits in the garage all night and the garage temp at first startup is 60 degrees, the ENGINE OIL temp never goes below 122 degrees. Why is that?
 

·
Premium Member
Joined
·
150 Posts
I have noticed that the trans temp on my new 2014 runs 190 to 200 after fully warmed up (15 or more miles of driving). This is 20 or 30 degrees warmer that my 2012 ran. I think it is due to the heat exchanger the new trans has to make it more efficient. I have 2 questions. What trans fluid temps are others seeing? I also have to wonder because this is a fill for life trans what kind of fluid is this? I have always understood that the warmer the fluid runs the quicker it breaks down.
Just drove about 12 miles on back hill roads using ECO mode. Average speed is about 35mph and outside temp is 45F. The transmission temp is was reading about 181F.
 

·
Registered
Joined
·
1,902 Posts
My '12 has always seemed strange - when the coolant is at 200F, the oil will be around 185F and the trans (5 speed) 170F. Even on a hot day.

To me this seems backwards though a lockup trans will not run as warm as one with just a TQ but particularly since the oil is cooled by the coolant.

Guage is one div under 1/2 at everything from 180 to 210. Midpoint seems to be 220 which is TDH.

Cannot the '14 dash display all of the engine parameters that a '12 does ? If not you need a OBD reader.
 

·
Registered
Joined
·
1,973 Posts
My '12 has always seemed strange - when the coolant is at 200F, the oil will be around 185F and the trans (5 speed) 170F. Even on a hot day.

To me this seems backwards though a lockup trans will not run as warm as one with just a TQ but particularly since the oil is cooled by the coolant.

Guage is one div under 1/2 at everything from 180 to 210. Midpoint seems to be 220 which is TDH.

Cannot the '14 dash display all of the engine parameters that a '12 does ? If not you need a OBD reader.
The 2014's have engine oil temp, trans temp and a voltmeter, but they took away the engine coolant temp digital reading. I guess they figured the analog coolant temp above the fuel gauge is good enough. What could it possibly cost to also have the digital coolant gauge. But they probably don't want the owners to know how hot the coolant temp gets, so they just leave the old style analog gauge.
 

·
Premium Member
2017 Summit
Joined
·
8,884 Posts
The 2014's have engine oil temp, trans temp and a voltmeter, but they took away the engine coolant temp digital reading. I guess they figured the analog coolant temp above the fuel gauge is good enough. What could it possibly cost to also have the digital coolant gauge. But they probably don't want the owners to know how hot the coolant temp gets, so they just leave the old style analog gauge.
How many people do you think actually look at these temps? Of those that do, how many do you think care if the temp is 180, 190, etc. As long as it's in range that's good enough for me. If I see a drastic change I take notice.

I'm sure at least one person around here has or will calculate the optimum temperature for every component in the car. Nice hobby, but in day to day driving it's pretty useless information.


---
 

·
Registered
Joined
·
72 Posts
I have seen my trans temp range from 180 - 205 when fully warm. The trans gets hottest when sitting in traffic then cools quickly down to the 180 range when I start moving.
 

·
Registered
Joined
·
1,902 Posts
I have been known to keep cars I like for decades & do not plan to change. One of the secrets to making everything under the hood last longer and the a/c work better is running the engine on the low side of "normal".

When the thermostat is a 195 that means keeping it under 200F (actually I prefer to run computer cars in the 180F-190F range & have never set a code).

My turbo-diesel RV is critical to temperature particularly EGT since it is tiny and has an aluminum head. It will produce amazing amounts of power for a short time but keep the boost above 9 psi for a long time and it will overheat. Diesels are like horses, they will keep giving the max until they fall over. Gas engines usually give warning if the driver listens.

All of my vehicles have full instrumentation, maybe have spent too much time around aircraft or due to the Jags of my yout. I no longer require an oil pressure guage though.

I do keep a minimal screen up in my heep and with a swipe can have 17 parameters up (I like tablets) but digital coolant temp, ave & inst MPG, volts, clock, tach, & speedo are enough for just running around since I cannot read the factory instruments on a bright day with sunglasses on.
 

·
Premium Member
Joined
·
357 Posts
Mine was running in the 190-210 range on my road trip this weekend.
 

·
Registered
Joined
·
100 Posts
Form my diesel truck experience, the tranny temp should be 60-80 degrees above ambient temp. That's just a rule of thumb and certainly may not be exact for a mid size SUV compared to a 3/4 ton diesel with a matching tranny. However, the 66RFE is supposedly not that far from the diesel Ram's 68RFE, but that also does not account for a much larger tranny cooler in the Ram as well.

Tranny temps rise quickly in hot weather, towing, or moving at slower speeds, or all three conditions simultaneously, but should cool down as speed increases and air rushes through. IF you are moving too slow or towing in hot weather, drop to a lower gear to run the engine faster to pump fluids and air. Lugging the tranny is also detrimental. Unfortuntately, I have not seen deep tranny pans like those for trucks. Aftermarket tranny pans can add an additional 3-4 quarts for better cooling and cooling fins.The best way is having a tranny cooler installed---the outside coolers work better than the combined radiator/tranny set ups.

Again, rule of thmb is keep that tranny below 220. Anything over 250 for more than an hour can start damaging the tranny. Heat kills.
 

·
Registered
Joined
·
126 Posts
To chime in, my 2014 warms up to 199 exactly when warm, then bounces back from 197 to 199. At first i thought there was a problem bc it is a little past the mid point and all the other gauges stay at the mid point. But the dealership said this was normal. If I put that big transfer case skid plate on, it runs around 205.
 

·
Registered
Joined
·
514 Posts
Not to bump an old thread, but just to add that my 2014 Hemi seems to sit around 195 - 197 and I've seen as high as 205 when it was 90 degrees out. Seems to be normal for the new 8 speeds based on what I've seen in this thread and several others.
 

·
Registered
Joined
·
1,973 Posts
Not to bump an old thread, but just to add that my 2014 Hemi seems to sit around 195 - 197 and I've seen as high as 205 when it was 90 degrees out. Seems to be normal for the new 8 speeds based on what I've seen in this thread and several others.
The 8 speed trans in my 2014 Summit V8 does run 30-40 degrees hotter than the 2012 Overland V8 did.
 
1 - 17 of 17 Posts
Top