I wasn’t driving it at the time, it was hot bubbling , could be radiator problem but … I haven’t used the car for a few years but want to get it going again … not much out there to replace it
id be checking to see if rad is blocked first , thermostat blocks very often of them also.
No way is the heads gone with 35000kms - its something silly
Flush it all out and put new stat in
I have had at least 4 over the years with dodgy stats that gave head gasket symptoms