tim replied:

have 3.0 litre tuorbo diesal after 3 days at stocton beach no probs also refer nissan club web site sure you will find your probs are not normal cheeck again with dealer after checking net .

Will replied:

Brendon,
I got a friend with similar problems. The other response was from somebody with a 3.0L Patrol which has a totally different engine.
After doing some research I found that the GQ Diesel is likelly to overheat. We still have not found the causes but after posting questions on on the net and on the Patrol forum it comes down to airflow and injection.

Rob replied:

Brendon

We have GQ 4.2 diesel with turbo intercool and it does the same thing. Put it under load and watch the temp gauge rise proportionally. The viscous fan on ours seems OK as you can certainly hear it cut in and the temp backs off once the airflow increases. I put it down to the additional power and the restriction on airflow of having to travel through the intercooler, then the condensor, before finally getting to the radiator. This must reduce the velocity. Tried backflushing the radiator once but it was very clean anyway and made no difference. Now I just keep a wary eye on it when it is under load and it gives no trouble really. Probably the radiator is slightly to small.
Rob

David replied:

Brendon, I had the same problem in my naturally aspirated GU Patrol diesel. I fixed the problem by replacing two things, the radiator cap and the thermostat. The cap can be checked cheaply by most workshops. The thermostat is a two stage and rather expensive.

Stuart replied:

Have had a similar problem with my 80 series GXL, it kept pushing coolant out through the overflow bottle. Sadly it turned out to be a hair line crack in the head which only opened up after long periods of load