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Why Am I Overheating On The Highway?

Why Am I Overheating On The Highway?

When traveling at high speeds you have the best of all engine cooling conditions; a high flow rate of coolant through your system and a high rate of cool air passing over your heat exchanger. 

Occasionally we have an inquiry from someone who describes overheating at high speed conditions.  We walk through the possible causes:

  • Is the temperature reading confirmed in multiple way to rule out a gauge failure
  • Is the return hose or suction has not collapsed due to greater draw at higher rpm choking flow?
  • Is the flow restriction caused by too few or too small a tube
  • Is the radiator core clogged with sediment or lined with scale which impedes heat exchange
  • Is the water passage in the jacket blocked
  • Is the pump impeller cavitating
  • Are there any obstacles to the air flow in front of the radiator?
    • Grill opening, winches and jacks etc.
    • External transmission coolers
    • Turbo air charger
    • Air conditioner condensers
    • Pusher fan
  • Is the fan shroud depth permitting air to escape
  • Is the impeller intact and secure on the shaft?
  • Is air exiting the engine compartment?
  • Is the radiator surface area and face area adequate for the engine demands?
  • Is the thermostat functioning or stuck or restricted?

If we can rule these out then we would suggest they look at the engine and why its generating the excessive heat.

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