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Q:

Coolant on 1990 Chevrolet 3500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My truck temperature tends to rise when go about 70 MPH. I flushed the system, replaced the thermostat and the clutch fan. I also pressure washed the radiator's fins.
(2) Answers
Take a flashlight and stare down into your radiator ( with the coolant out ) and see if the core of your radiator is getting plugged.