Interesting as I recently purchased a 2013 3.0L D4 with 103,000 Kms, which developed overheating issues even though serviced at JLR 2,000k previously. No fault codes present & no warnings displayed, after initial warning which disappeared after cooling period.
After a shut down and burning the gearbox oil, I had the oil replaced and new filter fitted. on the next trip, overheating warning occurred at 105Km mark. Allowed cooling period to only have a shut down 5km further a when stationary at a junction.. JLR couldn't locate a fault code, so there was no solution.
Located a LR specialised MECHANIC (not technician) who suggested possibly the transfer case oil should be checked & sure enough, it was black. This replaced & our next +100km gave a temp readout of 103°C
Having seen the location & size of the trans oil cooler, I suspect that size maybe an issue as well as a more frequent oil change, especially if towing and or travelling outback. The location does not provide a great deal of airflow either, especially sitting behind a cover guard!
Next run will be with a camper and a longer distance & we will be running temp readouts along the road to monitor & see if we need an additional cooler in the circuit.
There is a temperature build up when stationary as the torque converter is stationary and not pumping oil, hence the temperature buildup. The shut downs all have occurred when stationary at lights or junctions waiting for clearing of traffic.
Update
I have monitored the GB oil temp now on 3 trips.
1st trip was without towing camper, relatively cool day, after 107Km temp was 109°C
2nd trip was with a camper trailer (1800kg GVM), relatively cool day (26-28°C ambient temp), after 102km journey temp was 124°C.Temp increase was as soon as we hit traffic coming off the M! travelling south into Sydney. We skirted around the northern Hills Area to gain a steady run.
3rd trip was a return journey with the trailer, on a warmer day (24-32°C day). We travelled through from southern Sydney Metro area in traffic:1st temp warning was when ambient was 30°C. Rested for 20min to allow cooling to 119°C, but:-
2nd -4th Temp warnings over a 30min period of resting & cooling allowed us to reach family for a greater cooling period.
5-6th occurred after a a 45min rest and ambient had cooled to 22°C, but after 15km we were at 136°C and warnings again.
Our final rest & cooling was for 52min at the M! northbound entry and ambient fell to 18°C and we finally had a run home of 45Km with GB temp sitting on an average 109°C.
My observations are that while we have a reasonable air flow we are OK, but as soon as we hit Sydney traffic, the temperature climbs with little continuous air flow. Once over approx 120° threshold it appears as though there is little cooling effect to prevent temp build up.
Now "why is this so?"
Supposedly 3 tonne towing capacity & a 500Kg loading capacity allowing 200Kg tow ball weight.
On all occasions we have had little extra weight apart from the camper, but we have had cooling issues when unloaded.
We have an ARB bull bar, long range tank & wheel carrier fitted which increases the load but still 200Kg approx short.
Any thoughts folks?
I am resolved to having an extra GB cooler fitted to try & overcome the problem as travelling in the outback will have higher ambient temps.
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