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Q: Coolant on 1990 Chevrolet 3500 Pickup

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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.
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Take a flashlight and stare down into your radiator ( with the coolant out ) and see if the core of your radiator is getting plugged.
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