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  #13  
Old 08-27-2014, 03:17 AM
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Re: First Tow with Diesel

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Originally Posted by FHLH View Post
Not surprised the t-stat opens at 225. It ain't a gasser! Diesels are most efficient when warm and therefor do tend to run hotter. My cummins will jump from 190 to 220 with a load.

However, hitting red leads me to think this thing needs a bigger radiator or better cooling ducts. An SRT vented hood perhaps

What's the frontal area of that trailer?


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frontal area is about 8x8

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  #14  
Old 09-04-2014, 07:31 PM
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Re: First Tow with Diesel

I think the temps are fine for a diesel. I also think Jeep skipped out on changing the dial levels for the diesel vs gas engine and that's why it shows close to red but is fine.


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  #15  
Old 09-25-2014, 11:27 PM
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Re: First Tow with Diesel

I've been towing a bunch with my diesel and have had constant heat problems. Plenty of torque, and the engine wants to go, but I have to lay off the throttle because the temp keeps climbing. I disregard the needle on the coolant temp gauge and monitor the digital readout of oil temp. At 250F I start backing off. I wonder what the car would do if someone were to just keep their foot into it and let the temp build to... ??. I know folks will say it will de-fuel to prevent damage, but I wonder.
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Old 09-26-2014, 02:19 AM
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Re: First Tow with Diesel

For the OP: Dumb question, but do you have the Tow Group IV with the "Heavy Duty Engine Cooling"? Wonder if that would make a difference.

Also, anyone actually install the SRT hood with the heat extractors? I read somewhere that the Hemi GC can just swap hoods but the Diesels require some sort of modification.
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Old 09-26-2014, 04:48 AM
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Re: First Tow with Diesel

Yes, I have a summit diesel. Comes stock with everything


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Old 07-31-2015, 07:06 PM
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Re: First Tow with Diesel

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Originally Posted by evenflow View Post
. I wonder what the car would do if someone were to just keep their foot into it and let the temp build to... ??. I know folks will say it will de-fuel to prevent damage, but I wonder.
On the RAM forums, the consensus is that the eco diesel in the RAM backs off on the fueling when it gets too hot, not sure if the gc eco does the same (but would think so)..
YMMV
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  #19  
Old 08-01-2015, 08:07 PM
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Re: First Tow with Diesel

FYI - Regarding "high" oil temperatures.

The American Society of Testing Materials (ASTM) standard wear resistance tests are conducted at 302º F. In this test synthetic lubricants far out perform petroleum lubricants by factor of four to one and greater.

Here's a linky to the Pennzoil Ultra Euro L 5w30 MSDS with all the info on it

http://s7d9.scene7.com/is/content/Ge...04053pdf?$PDF$

So, with synthetic oils, 250F oil temps are just fine !
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Old 08-01-2015, 09:53 PM
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Re: First Tow with Diesel

That's good to know about the oil but that doesn't help with warping aluminum heads from high coolant temps. My VW diesel had a 192 t stat. I really wonder what, if anything, would be off if we found a 210 tstat to play with.
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Old 08-02-2015, 09:26 AM
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Re: First Tow with Diesel

Yesterday as part of our Chicago to Southwest vacation trip, we drove from Denver through Eisenhower Tunnels with no RV to pull. Just me and my husband and our 2 kids and some 300 lbs extra load. We noticed that the temp gauge was climbing to above normal to the third main line sometimes passing that line and the oil temp was 239. My husband tried to control the overheating by using the speed paddles and keeping the speed at 55-60 and rpm at 2500. We are planning to pick the rental RV trailer in Salt lake city tomorrow. The trailer is Coachman Catalina 4500 lbs dry weight. May be with everything in, the weight goes up to 5500-6000. We also noticed this morning that coolant level was dropped little bit not so much though. We appreciate any advice from the experience people. Other than that this car is great and we are enjoying our vacation with our 2015 GGC. So far we have put on 11K.
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Old 08-02-2015, 06:28 PM
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Re: First Tow with Diesel

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Originally Posted by Olivia_2015 View Post
Yesterday as part of our Chicago to Southwest vacation trip, we drove from Denver through Eisenhower Tunnels with no RV to pull. Just me and my husband and our 2 kids and some 300 lbs extra load. We noticed that the temp gauge was climbing to above normal to the third main line sometimes passing that line and the oil temp was 239. My husband tried to control the overheating by using the speed paddles and keeping the speed at 55-60 and rpm at 2500. We are planning to pick the rental RV trailer in Salt lake city tomorrow. The trailer is Coachman Catalina 4500 lbs dry weight. May be with everything in, the weight goes up to 5500-6000. We also noticed this morning that coolant level was dropped little bit not so much though. We appreciate any advice from the experience people. Other than that this car is great and we are enjoying our vacation with our 2015 GGC. So far we have put on 11K.
Thanks
I just did a trip in July from Utah to Mt. Rushmore in SD. I went through WY on my way and hit a few passes towing my 2015 Jayco Jayflight 28BHS. Dry weight is 5400lbs and GVWR is 7400. I never weighed it when we were driving but I would imagine that it was only about 6500 when loaded. We towed it dry almost the entire trip. I averaged 13.2 MPGs for my 2000 mile trip. The Diesel towed great. It did get hot but it never crossed the red line. As long as you monitor the temps as you cross over a pass you will be fine. It was great having the power to pass even slower vehicles. I towed about 65MPH the entire trip. Trailer tires were only rated to 65. Hope this helps.
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  #23  
Old 08-03-2015, 01:23 AM
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Re: First Tow with Diesel

Thank you. Today, we were driving from Green river to SLC via Highway 6. We noticed that there is a long uphill drive from Spanish Fork . We are not sure which route we should take when towing from SLC to Moab (I 70 or HW 6). Could anyone give us a suggestion which route we should take. We also noticed when the engine is running idle and the car is not moving, with air condition on the oil temp and the coolant temp stays normal. but with ACON off, the the temp gauge rises but the radiator fan does not start.
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  #24  
Old 08-03-2015, 02:25 AM
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Re: First Tow with Diesel

This is definitely a great tow vehicle - other than the cooling issue.

Last year on a trip to Kings Canyon, CA towing a ~4900# Airstream, I was running right at the red line on water temp and about 260 degrees oil temp climbing up out of the valley with the ambient temp at about 95 degrees.

Pulled over for a quick stop and turned the engine off for about 5 minutes. When I restarted, the vehicle went into limp mode until the water temp came back down... I generally use the paddle shifters in mountain driving, but keeping the RPMs up when climbing doesn't seem to help keep the water temp down.

Fuel mileage, however, is excellent! I actually saw my best and worst stats on the same day (21 mpg from Diamond Lake to Medford, OR & 15 mpg from Medford to Weed, CA). Overall average towing this trailer is 16.5 - 17 mpg, which is way better than the 8 - 9 mpg I used to get towing with my 2000 WJ w/4.7L V8.

Just wish I had a bigger radiator...
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