Took the heater core and the radiator in for testing yesterday. Heater core passed the pressure test with only 1 of very small crack found which will be braised up when the core is flushed to remove debris.
As I expected, the main radiator is cooked. Needs a new hand made core to the tune of $625 NZD. I'm not keen for the cheap aluminum replacements. Buy once, cry one in my opinion.
Interesting thing the technician mentioned about the radiator. He said its unusual to see a three core radiator on a 2.0L petrol engine, usually he only sees them on diesels.
Those of you with factory L20Bs, do you have three core or two core radiators ?
The replacement will be a two core to save costs. Tech reckons it will provide ample cooling.
Anyways, hope your all going swimmingly and giving those dattos some love if your in lockdown.