I had a problem like this I did a coolant change, used a different brand, this caused "flocking" like small fibres in the coolent. I would swear blind I flushed all of the old coolent out, got the rad serviced and he said it was 30% blocked. Explained flocking, also recommend rmi 25. So I used it. Fantastic.
Overheating solved, driving around in 35+temps, all day any speed a/c flat out.
No so much towing 1.8 ton trailer up a range in in similar temps.
Still working on that.
Good luck with it.
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Obd1 scanner.
'95 sport,4.6 stroker, 4.5" lift, 32"s, 4:10's, 8.25&SYE, taurus fan
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