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  #49  
Old 05-15-2014, 02:20 AM
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Re: Towing Review//Engine Heat

Thanks Emerson. Just wondering whether you shifted manually when going uphill, or did you leave it in "Drive" and adjust your speed accordingly to maintain 2000rpm as the transmission shifted up and down?
What sort of outside temperatures were you experiencing at the time?

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  #50  
Old 05-15-2014, 09:24 AM
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Re: Towing Review//Engine Heat

I just left it on Drive going up, and it pretty much stuck to a couple of lower gears -- 3 and 4??-- the numbers are hard to see in drive. The engine was amazingly steady. Outside temps were in the 40's at the bottom and low 30's at the top. I cannot emphasize how much this experienced relaxed me about the capabilities of this engine.
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  #51  
Old 05-15-2014, 12:04 PM
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Re: Towing Review//Engine Heat

If coolant temp is a concern you can add cooling additives such as Redline Water that'll help bring down temps (makes the water more effective in sticking to surfaces providing more cooling). I used this in my CRD as in KS we get > 100 degree days and towing in it is hard on the engine.
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  #52  
Old 05-15-2014, 07:19 PM
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Re: Towing Review//Engine Heat

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Originally Posted by jaje View Post
If coolant temp is a concern you can add cooling additives such as Redline Water that'll help bring down temps (makes the water more effective in sticking to surfaces providing more cooling). I used this in my CRD as in KS we get > 100 degree days and towing in it is hard on the engine.
Please be careful with adding anything other than OAT coolant, conforming with MS-12106. Any other additives are frowned by Chrysler and may react with the coolant and damage your engine.
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  #53  
Old 05-16-2014, 12:03 AM
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Re: Towing Review//Engine Heat

I think the takeaway from this thread is that the GC Diesel tows well but cooling capacity of the radiator is not designed for 100% continuous output. You can't floor it towing up a long hill and expect the temperature to not rise.

This is no different than nearly all other vehicles. The engine has more power output and heat generation than the cooling system can deal with continuously. Heavy duty diesel trucks are designed for this but our little GC Diesel is not. That's OK. Just don't run it at 100% capacity for extended periods and it'll be fine.
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  #54  
Old 05-16-2014, 06:40 PM
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Re: Towing Review//Engine Heat

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Originally Posted by ExcursionDiesel View Post
I think the takeaway from this thread is that the GC Diesel tows well but cooling capacity of the radiator is not designed for 100% continuous output. You can't floor it towing up a long hill and expect the temperature to not rise.

This is no different than nearly all other vehicles. The engine has more power output and heat generation than the cooling system can deal with continuously. Heavy duty diesel trucks are designed for this but our little GC Diesel is not. That's OK. Just don't run it at 100% capacity for extended periods and it'll be fine.
In my humble opinion you might be being a little too generous to Jeep.
Having towed 2.5 tonnes (5,500lb) on a 16c (61F) day and watching the needle on the temp gauge come very close to the red on steep grades leads me to believe that the cooling system is inadequate for the vehicles capabilities, and considerably less adequate than most of it's contemporaries.
In Australia and many parts of the U.S., summer temperatures regularly hit 40c (104F) and above. If the JGC's full towing capacity were utilised (or even less) on a day like that, it is difficult to see the car coping with even moderate grades without overheating.
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  #55  
Old 05-16-2014, 08:08 PM
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Re: Towing Review//Engine Heat

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Originally Posted by Blackadder785 View Post
In my humble opinion you might be being a little too generous to Jeep.
Having towed 2.5 tonnes (5,500lb) on a 16c (61F) day and watching the needle on the temp gauge come very close to the red on steep grades leads me to believe that the cooling system is inadequate for the vehicles capabilities, and considerably less adequate than most of it's contemporaries.
In Australia and many parts of the U.S., summer temperatures regularly hit 40c (104F) and above. If the JGC's full towing capacity were utilised (or even less) on a day like that, it is difficult to see the car coping with even moderate grades without overheating.
I agree, I was being gentle with my statement. Basically, I'm saying the cooling system is probably sized for 180 HP (135kw) continuous duty so when negotiating grades, care must be taken to not require more work than the cooling system can handle. Being rated at 7200 lbs doesn't mean its guaranteed to pull a hill at 70mph! The other poster commented that slowing down was his solution.
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  #56  
Old 05-16-2014, 08:29 PM
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Re: Towing Review//Engine Heat

I am currently trying to find out as part of a ECU re-flash I am planning if they have access to the fan PID's, and how it is set up and if they can adjust.

Should be able to update shortly.
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  #57  
Old 05-16-2014, 09:35 PM
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Re: Towing Review//Engine Heat

Quote:
Originally Posted by chocco View Post
I am currently trying to find out as part of a ECU re-flash I am planning if they have access to the fan PID's, and how it is set up and if they can adjust.

Should be able to update shortly.
That would be excellent. Even if the cooling system is undersized, having it stay ahead of demand would help for hills that aren't long.

I had a camaro that refused to turn on the fan until it was too hot already. I added a switch and relay to override the ECU and power the fans directly. Maybe this would help if the ECU can't be tuned to kick the fan on earlier. Call it a "tow mode" switch. You could even use a manual thermostat switch in series set to a lower temperature that would cycle the fan on demand when "tow mode" is enabled.
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  #58  
Old 05-18-2014, 04:35 AM
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Re: Towing Review//Engine Heat

I wonder whether a heavy duty radiator is available yet (Probably aftermarket), or whether any of the petrol engines use a larger core.
Has anyone looked into that?
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  #59  
Old 05-18-2014, 06:20 PM
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Re: Towing Review//Engine Heat

Quote:
Originally Posted by netboy View Post
Please be careful with adding anything other than OAT coolant, conforming with MS-12106. Any other additives are frowned by Chrysler and may react with the coolant and damage your engine.
Coolant should be the same across the board - maybe dilution level of glycol but coolant should always be chemically inert so any additive such as water wetter should not cause any issues (they are also an inert compound but one that helps water adhere to surfaces better and allows water to get past the vapor barrier (when water turns to gas b/c of heat) creating the better heat transfer from surface being cooled to the fluid cooling it).

I've used water wetter in my '07 CRD and it helped. Always add after a flush (and not to old water / coolant). You can also cut down the mix to 40 coolant / 60 water with this as it gives more cooling effect. We use these in racecars with plain distilled water (can't run coolant b/c leaks of it on the track lead to slippery conditions almost worse than oil!).

That is unless the coolent in the WK2 ecodiesel is entirely new type of coolant then ignore the above and ask redline first if they've tested it. Funny thing is redline was created for fire pump trucks to add to water to reduce friction in the pumps and the lines so that the water can be thrown farther!
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  #60  
Old 05-21-2014, 09:54 AM
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Re: Towing Review//Engine Heat

I just had the oil changed after our 4200 mile towing trip (4500 lb TT) including several 10,000+ Colorado mountain passes where the heat gauge needle had approached the "hot zone"-- detailed in earlier posts. I did this even though the oil life monitor showed about 50% remaining life because I was concerned about the condition of the oil after running the engine so hot. I am told the old oil looked fine, not at all burned or even darker in color, no evidence that it had been running too hot. I told the service guy that the oil temp topped out at 246 degrees, and he said that should be no problem. As I said earlier, the heat gauge needle stabilized at the halfway mark in the third quarter of the gauge when I held the rpm's to around 2000 towing up those long 7% and 8% grades, and the Jeep felt like it could have happily cruised all day up those grades at that level. This report from the service department seems to confirm that there was in fact no overheating.
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