Diesel Overland heating up towing 3 tonne caravan - Jeep Garage - Jeep Forum

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  #1  
Old 11-25-2014, 11:45 PM
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Exclamation Diesel Overland heating up towing 3 tonne caravan

Have an Overland Diesel, 9,000 kms, while towing up longer mountain ranges (several on the F3 (now M1)) the temp gauge gets close to the Orange range, irrespective of the prevailing conditions. Went north on a 37 degree day and South on a 27 degree day, similar performance. No over temp warnings, but the gauge escalated quite quickly on both occasions up the longer hills.

Anyone else have any issues towing largish vans up longer mountain ranges? Temp returns to normal quickly once back on level ground.

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Old 11-26-2014, 12:08 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

This is a common observation. I've had the temp gauge escalate quickly going uphill when offroad.... not towing, then come down again when descending. I don't believe it is anything to worry about.

My theory is it is the EGR valve closing when there is higher load, so engine temps increase.
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Old 11-28-2014, 03:25 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

There are a number of posts on other forums regarding the apparent engine coolant temp rise when towing with a 2014 up hills......in exactly the manner you describe.
Several posters have carefully monitored actual engine, oil, and transmission temps in this situation using various smartphone apps that allow access to the system.
Consensus is that while the dash gauge shows a spike, the temperatures are nowhere near abnormal ranges, the guage simply reflects the machine is working a bit harder than normal.
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Old 11-28-2014, 07:07 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

Long time, no see John!
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Old 11-29-2014, 10:56 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

I noticed a significant increase in engine temp while driving my 2014
JGC Summit Ecodiesel south up the "Grapevine" on I-5 at about 65 mph. I was not towing. Ambient temp was 70's F. This was unusual in my experience and not seen on higher passes through Oregon. Temp dropped immediately on the downhill run.


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Old 02-04-2015, 11:54 PM
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Re: Diesel Overland heating up towing 3 tonne caravan

I ALWAYS monitor mine with my OBDII port connected to an iPad, whenever towing my 3T van.
Yes, the temp gauge moves a lot, (unlike many makes which are damped down to the point of outright BS), but I have yet to have an actual issue with overheating.
It gets your attention as the gauge heads up near the limit on a hill, but for me at least, I'm not concerned, temps are well within limits.

Cya
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Old 02-05-2015, 02:35 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

What temps are being seen

Mine has been up to almost 120
Me thinks that is tooo high


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Old 02-05-2015, 03:56 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

Quote:
Originally Posted by fwdjeep View Post
What temps are being seen

Mine has been up to almost 120
Me thinks that is tooo high


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Seems way to high for a 13, didn't think they suffered the same issue as the 14zzz. Mate has a 12/13 tows just under 3T never see figures like that.
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Old 02-05-2015, 04:11 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

Complained to dealer they have no idea


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Old 02-05-2015, 06:49 AM
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Re: Diesel Overland heating up towing 3 tonne caravan

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Originally Posted by fwdjeep View Post
Complained to dealer they have no idea


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Don't like this increase in temp on my 14 either, have learnt to live with it. Sort of!! When I have had my scan tool fitted it gets up around 110 but comes back slowly to around 97 when under load(2.7T towing). My normal operating temp is around 93/94, from what I have seen 13 seems to operate cooler, normally 87. What I have found is that the cooling fan on the 14 doesn't cut in early enough to control the temp when the vehicle come under load and the coolant system is then in catch-up mode.
Dealer has no idea? Don't Hold Back!!
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Old 02-09-2015, 05:59 PM
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Re: Diesel Overland heating up towing 3 tonne caravan

Mine is NEVER under 97 C once warmed up.
And guess what, when you look at the specs,
that's about the temp at which the thermostat STARTS to open.

ie: the thermostat is only starting to open, not fully open, at 97 Celsius.
These engines do run hot, and are designed to do so (it improves fuel efficiency).

Synthetic oils will handle those temps no problem at all.
Whilst I worry about other things like DPF regens etc (haven't had any issues yet), engine running hot is not something I lose sleep over.

Cya
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Old 02-09-2015, 07:18 PM
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Re: Diesel Overland heating up towing 3 tonne caravan

I suspect the temp increase is the EGR valve closing off to deliver more power under load. Mine heats up going up 4wd tracks with nothing being towed. 115 is the highest I've seen. But it cools off very quickly once on level road or going downhill again. I reckon its the EGR. In other words, working as designed.
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