I have a 4.5 and it was getting a bit hot when on idle for a few minutes or being stuck in the traffic. Just enough for the elec fan to kick in, but with air flow no problem. The Tallarook drive about 6 weeks ago I ran most of the day at a little under 3/4. Being the first summer with this car and having a sh!t of a time with my last 4wd, I thought I need to sort this out.
I took out the radiator and noticed some dry mud on the outside of the arc of the fan behind the shroud, just above the bottom outlet point of the radiator. Meaning that hot coolant is entering. Cleaned it inside out, put back in, fill radiator, start car, take out top hose from the radiator. As temp starts to raise and the thermostat begins to open keep filling the radiator, this will push all the old coolant out. Once it is just water refit top hose put 5l of concentrate and top up with water.
My temp now gets to the correct level and doesn't move regardless of outside conditions.
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