Radiator / Overheating Problem

[vinj]

thanks for enlightening me

so my next question is: are there any tell tale signs if your radiator has micro cracks on it already?

Visual inspection is good.

With a high mileage or old vehicle that's still using it's original radiator, better to take it down for a general service and inspection. Using coolant also helps as seepage can be seen with the residue that gets left behind.

Here's what the radiator of our LC80 looked like a few years ago, when we had the radiator shop take it down for service and inspection (the LC was at least 15 years old that time).