Overheats Towing - Page 2 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Trouble Shooting/Problems/Service

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #13  
Old 10-19-2015, 09:46 PM
Keysplayr's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Apr 2015
Posts: 115
Thanks: 6
Thanked 18 Times in 16 Posts
Rep Power: 788
Keysplayr has a reputation beyond reputeKeysplayr has a reputation beyond reputeKeysplayr has a reputation beyond reputeKeysplayr has a reputation beyond reputeKeysplayr has a reputation beyond repute
Garage
Re: Overheats Towing

What is the difference in coolant and transmission fluid (if that's how the tranny fluid is cooled) capacities from the 3.6 rad to the hemi rad?

__________________
-Anthony
'15 Laredo Custom
Reply With Quote
Sponsored Links
Advertisement
 
  #14  
Old 10-20-2015, 08:29 AM
The Evil Twin's Avatar
Member
My Jeep: 2011 5.7L WK2
 
Join Date: Jan 2013
Location: Gainesville, VA
Posts: 641
Thanks: 32
Thanked 72 Times in 55 Posts
Rep Power: 440371
The Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond reputeThe Evil Twin has a reputation beyond repute
Garage
Re: Overheats Towing

Quote:
Originally Posted by Keysplayr View Post
What is the difference in coolant and transmission fluid (if that's how the tranny fluid is cooled) capacities from the 3.6 rad to the hemi rad?
Coolant, or antifreeze, is what circulates through the engine to remove the heat of combustion and friction. (Note: A secondary function of motor oil is also heat evacuation, so it is also a coolant.)

Transmission fluid is in the gear box and is used to drive/ operate the transmission.Some vehicles are equipped with a transmission cooler. These can either be oil to air or oil to water.
Oil to air- much like the radiator. Trans fluid is pumped to the cooler which resides in front of the engine radiator. The air flowing over it removes heat and it is returned to the trans.
Oil to water- Trans fluid is pumped to the engine radiator which is constructed with secondary passages to allow the heat from the trans to be rejected into the antifreeze. They do not mix, they just travel next to each other in the radiator tubes.

In the '11 model the 3.6 has a radiator capacity of 10 quarts with or without the tow package, and the 5.7 has a capacity of 16 quarts with the tow package.
__________________
#132-Motosylum Racing

2016 Sponsors: Amsoil, SHOEI, www.DC-MOTO.net, VP Racing Fuels, www.MARRC.org
Amsoil 5w-20 synthetic meets Chrysler MS-6395 for my Jeep!
Reply With Quote
The Following User Says Thank You to The Evil Twin For This Useful Post:
  #15  
Old 10-20-2015, 09:48 AM
Member
 
Join Date: Aug 2010
Posts: 316
Thanks: 5
Thanked 45 Times in 40 Posts
Rep Power: 2612
Nonstop is on a distinguished road
Re: Overheats Towing

Please stop saying put 180 thermostat in people, this engine is intensely computer-controlled and changing the parameters by which it works without changing the pattern that it works with will do no good and likely cause harm if not poor gas mileage. As for the 11 radiator versus the hemi, yes it has a larger capacity but it's not all the rad. the block of the 5.7 is significantly different. In perfect good working order the 3.6 is more than capable of cooling itself under towing conditions even up a hill and in the heat. You're not fixing anything by modifying something while it's broken.


Sent from my iPhone using JeepGarage
__________________
2011 X 3.6
2000 WJ 5.2
Reply With Quote
The Following User Says Thank You to Nonstop For This Useful Post:
  #16  
Old 10-23-2015, 10:35 AM
New Member
My Jeep: 2011 3.6L WK2
 
Join Date: Oct 2015
Posts: 4
Thanks: 10
Thanked 0 Times in 0 Posts
Rep Power: 0
Capt Bligh is on a distinguished road
Re: Overheats Towing

A couple more observations:

I've been watching transmission temps while trying to figure all this out; tranny temp does not budge - stays well under 200 F.

Yes, it shifts down to 2nd as soon as I tip in enough throttle to maintain speed.

Once in 2nd, I am not at full throttle; but I am seeing approx 4K rpm.

There was an improvement in using E85 on my last trip over Guadalupe Pass. Coolant temp still got to 239-240, I had to turn the AC off, and we slowed down to 55 from the bottom of the hill, but we did make it over w/o going into limp mode (First time ever in serious heat). For those of you that also have this problem, the thermodynamics of ethanol says there is some benefit.

My ultimate solution: the WK2 is now the wife's grocery hauler, and we will be buying a V8 or diesel tow vehicle.

Thanks to all that have replied to this post.
Reply With Quote
  #17  
Old 10-23-2015, 03:05 PM
midsouthduckhunter's Avatar
Member
My Jeep: 2014 3.0L WK2
 
Join Date: Aug 2015
Posts: 207
Thanks: 23
Thanked 32 Times in 28 Posts
Rep Power: 696
midsouthduckhunter is on a distinguished road
Garage
Re: Overheats Towing

4000 rpm huh. Seems pretty high for dropping out of OD but I'm not doubting you. From the power curves online the 3.6l makes peak power (cross of hp & tq curves) at 4200 rpm.
https://images.search.yahoo.com/imag...01&fr2=piv-web

I think you could achieve sufficient cooling w/a bigger radiator so if your not aggravated too much then (yet another) bigger radiator for $3-400 might be worth it unless it's time for another vehicle in your fam. Sometimes you just can't get where you want with what you have.
Reply With Quote
  #18  
Old 10-23-2015, 03:34 PM
Premium Member
My Jeep: 2014 5.7L WK2
 
Join Date: May 2013
Location: Colorado
Posts: 3,948
Thanks: 72
Thanked 264 Times in 236 Posts
Rep Power: 46197
lstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond repute
Re: Overheats Towing

Quote:
Originally Posted by padgett View Post
I'd start with synthetic oil, "water wetter", and a 180F thermostat. Agree the Pentastar likes more revs than a Hemi or Diesel.

I also use Torgue Pro, a dongle, and a 7" Android tab to monitor a lot more parameters. What you want to do is to keep it out of PE (performance enrichment) mode except for short bursts and not a 7/7 grind. It does like what seem to be high revs - 3500-4500 and has a very flat torque curve. Are you climbing in 2nd gear (55 mph = 4100 rpm) ?

May make some mad but HP really only matters for accelleration. Torque is what climbs a hill and the lower the gear the more torque goes to the pavement.

BTW my '12 also has the tow package but with 2WD you did not get much, just the hitch, wiring, and a full sized spare.
I'd toss all that in, and check around for a higher performance radiator, possibly a higher performance oil cooler from the aftermarket as well.

Presumably your fan should sound much like a hovercraft before you get anywhere
near limp mode--again aftermarket refitters for desert off road geeks might have something better than standard Mopar. Same for water pump.

Too bad it isn't the 4.0...


Are all your shrouds in excellent condition and correctly installed? Those can make a difference.

You might want to check compression and ignition timing--not expected to be the issue but a very small exhaust leak into the water jacket might exist, or retarded timing due to fuel quality causing it to back off to avoid detonation would be worth looking at before hitting the aftermarket.

What are the outside temps, and your engine rpm averaging uphill? A lugging engine will heat up fast.
Reply With Quote
  #19  
Old 10-23-2015, 04:21 PM
simonvez's Avatar
Member
My Jeep: 2012 3.6L WK2
 
Join Date: Sep 2014
Posts: 248
Thanks: 59
Thanked 55 Times in 38 Posts
Rep Power: 1322
simonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond reputesimonvez has a reputation beyond repute
Re: Overheats Towing

you all seem to talk about HP... Torque is what will matter when towing. And the Pentastar is full torque arround 1600rpm to redline
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Towing questions. First time towing looking for some input. JTS97Z28 Grand Cherokee - WK2 - 5 08-25-2012 04:53 PM
03 Jeep Grand Cherokee- towing specs & curb weight johnpsully Grand Cherokee - WJ 4 02-21-2010 01:45 PM
wj towing mountian goat Troubleshooting/Problems 11 02-20-2010 05:13 PM
3.7 towing rating B.P.O.D Grand Cherokee - WK 60 02-11-2010 01:23 AM
cherokie towing erleep Grand Cherokee - WJ 3 10-20-2009 11:41 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:01 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.