It sounds like u need to replace the thermostat. At slower speeds the air flow through the radiator is minimal, but at higher speeds the air cools the radiator more. This only happens if the thermostat is not keeping the water in the engine block long enough.
A direct relationship; temperature is a measure of the speed of molecules, so a higher temperature means faster moving molecules and a higher rate of diffusion (molecules moving across a solution and/or through a permeable barrier) and lower temperatures mean slower speeds and a slower speed of diffusion.
My minivan was doing something very similar. Does the vibration/wobble stop when you let off the accelerator? Try coasting down a hill without touching the gas pedal; if the vibration stops when you let off and then starts again when you push on the gas pedal there's a good chance the vehicle has worn-out motor mounts. I was skeptical when my mechanic told me this, but after he replaced the mounts on my '92 Voyager 3.3 liter there was a huge improvement to the wobble/vibration that I had.
Temperature measures the average kinetic energy of molecules. The molecules of a substance move or vibrate at different speeds, causing something to be warmer/hotter or cooler/colder. The faster they move, the warmer it feels, and the higher the temperature. It can be measured in Fahrenheit, Celsius, and Kelvins.
Higher speeds involve higher forces which do more damge in breaking bones, etc. Ther force is f=ma = mdv/dt, the higher the speed the greater the deceleration on impact thus causing greater force on structures. There is also higher energy in higher speeds. At low speeds the energy and forces are smaller. The energy goes up by the speed squared, so twice the speed gives four times the energy. Twice the speed gives twice the force. The damage relates to the force the structures can take before damage.
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