Just glancing at other people's posts, it sounds like I should do a precautionary change-out of my coolant. The truck's a '97 Silverado 4x4 and I've never changed the coolant but have added to it. That's going on 7 years and it sounds like changing it every 5 is better. The truck has 75k on it.
Is flushing necessary?? Or do I just run the motor to open the thermostat, shut it down, and drain it ...followed by filling at the radiator and reservoir again (etc). I assume the radiator has a wing-nut type drain on the bottom, right?
Thanks, Brian