Chevrolet Q&A

Ask Your Question

1990 Chevrolet 3500 Pickup Question: Coolant



lcomer72, 6.2L V8 Diesel, Indianapolis, IN, September 24, 2009, 13:28

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
Flag This
  • Medium-star Best Answer
    September 24, 2009, 17:30

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

    Flag This
  • Answer #2

    Visitor, April 14, 2011, 10:43

    She may be leaning out at 70 mph do you have a exchaust temp gauge or a turbo presser gauge?

    Flag This