Coolant overflowing 2003 Patrol GU3 3.0L Diesel

[Hallett505]

Thanks, and one last newbie question, when cold should the radiator have cooolant right to the top of the tank or does it get sucked in from the plastic reservoir as it warms up?

[mudski]

It goes the other way. Out to the surge tank when the coolant heats up. And back into the radiator when it cools down.

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[Hallett505]

I have now read some comments on forums suggesting a hair line crack in the overflow bottle that only allows coolant to escape virtually in a steam state can cause this issue, or even a small crack in one of the hoses, they suggested some bars leaks in the first instance and if that doesn't work, replacing the overflow tank and hoses, I will just take it a step at a time, doing the cheaper things first, so I will replace both caps and get some bars leaks on the weekend and try that

[mudski]

I have now read some comments on forums suggesting a hair line crack in the overflow bottle that only allows coolant to escape virtually in a steam state can cause this issue, or even a small crack in one of the hoses, they suggested some bars leaks in the first instance and if that doesn't work, replacing the overflow tank and hoses, I will just take it a step at a time, doing the cheaper things first, so I will replace both caps and get some bars leaks on the weekend and try that

I wouldn't be using bars leaks in it yet. I dont think this will fix your issue. The surge tank on my zd had a hairline crack in it and coolant didn't steam out mate. It just dripped out all over the aux battery tray. You sure the over flow tank, the one with the screw cap on it, is not just over full?

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[Cuppa]

Replace the hose between radiator & surge tank first. Cheapest & easiest think to try.

[mudski]

They're a large, well largish 1/2 inch id hose cuppa. I doubt it would be this. I would empty the overflow on this, not the top tank with the pressure cap and then take it for a run.

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[Hallett505]

Thanks everyone, I got two new caps this morning (only cost $20 in total) Once I got the Patrol on level ground I found it had a full radiator of coolant and the overflow is still full so all good! Looks like I was worrying about nothing

[threedogs]

A good 3ltr will do that to you ha ha ha
Good to here you got it sorted