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

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...

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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And as I just found out the radiator cap is on the plastic overflow bottle
the cap itself on the radiator is about $18 on Ebay, or try Mudski for one.

the car is 12 years old . if the radiator cap is not holding enough pressure it might be releasing coolant but not enough to over heat unless pushed hard. radiator caps are cheap so maybe a good...

That should sort it out

Worth checking - also the radiator cap as it should allow any pressure buildup to push into the overflow tank. When required the motor should pull the fluid back into the coolong system. It would be...

Maybe you need a new OE thermosat?

I also have the Dr Air Pro FLow 150lt unit - great compressor so far gets a little hot but not too bad.

Welcome to the forum mate.

Welcome to the forum mate.

I have the same as Cuppa but now I think there are better smaller more efficient pumps out there.
If you can combine it with a air tank like I did on my other 4x4 and you'll be using air tools such...

The other factor as well as litres per minute is ‘duty cycle’. Some might be capable of 150 litres per minute, but with a low duty cycle requiring them to be switched off after each tyre & a waiting...

I think now days you can get a 70 lpm plus pump quite cheaply. No reason to go lower. The 160 lpm pumps are very fast but are bulky and heavy compared to the smaller pumps.
Then there is the price...