I sold my SWB 90 recently with over 275k miles on the clock.
I only ever had one issue with the cooling system, on the motorway the needle would rise until it was at 10'oclock it usually sat just below 9 oclock.
Flushing the system did nothing to stop this problem however replacement of the radiator cured it.
The engine never gave any trouble with the cooling system apart from that one instance.
Points to note: This was a Manual SWB with base spec, no Aircon and no automatic.
With the Aircon the flow through the radiator can be quite slow especially if the area between radiators is not kept clean, also Automatic versions put extra heat into the cooling system.
On their own these are probably not enough to cause an issue, together with a radiator that is getting slightly blocked and extra heat load from speed or load this could cause the head to overheat.
I understand that Toyota fit resistors in the temperature gauge to slow the range of movement to avoid customers complaining about the temp needle moving during normal operations, this could also cause problems as many people never check the dash and by the time the needle is in the upper range it could be damaged.
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