A leak pressure test is also a cheap worthy test. Sadly East West core radiators are hard to visually inspect without a camera. But usually block the worst from bottom rows upwards.
After 20 years, I would take it out and get it cleaned.
99% of radiator flush chemicals these days are snake oil.
I personally have more faith in putting 6ltrs of cheap cleaning vinegar !
Air con condensers are a big culprit of air restriction even when brand new.
Inspect for damaged/ blocked fins.
The water jackets in the heads on the straight 6 4ltr are not big, and they are known to restrict flow from build up.
If you have a good clean drive way, drop your bash plate off, undo your bottom radiator hose, get it to warm hot.....
Then rev it hard to get the bottom hose to pop from the radiator.
This burst will soon show you how much crap it blasted out with the water.
Don't get scalded!
If its an auto, even the transmission can affect radiator temp if the trans is getting to hot.
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