Returned back to Auckland after a South Island road trip including FlatNats with a few other CS members.
Heading North from Akaroa I noticed my rad fans running loudly whilst sitting still. Was a hot day (29°C) and had just had a spirted drive over the Akaroa hills so didn't think much of it.
No temp gauge in the car meant I relied on Cold/Hot temp warning lights.
After taking it easy for a while I and still hearing the fans I became a tad more concerned. Plugged in my trusty OBD2 Bluetooth adapter and ran Torque... coolant temp was sitting between 102-108°C. Stopped in Kaikoura and checked coolant... overflow was empty. After topping up temps returned to a more comfortable 84-90°C.
@Firenza grabbed a radiator cap for me in Wellington and checked everything in Palmy this morning... rad cap was busted. New cap on and happy days.
For those with newer Subarus that lack a proper temp gauge, I highly recommend grabbing a cheap OBD2 Bluetooth adapter so you can quickly check temps etc.