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I have a 2000 Ford Ranger 4x4 2.5cc turbo diesel, owned from new and I love it, but over the last 12 months if i go over 80-85 mph she starts to over heat, lowering the speed back to say 70 she cools down. She will run all day every day at 65 - 75 but try to push the speed up and up goes the temp gauge ?
Some theory: To increase speed from 50 to 75 mph costs the average car four times the power. 75 to a hundred is eight times give or take. So the faster you go the more stress your cooling system is under. Next is air flow. Your vehical will not flow 85 mph air through the rad at 85 mph. But at 50 mph I bet that flows pretty close to 50 mph, so because of how the airodynamics works the air flow does not increse nearly as quickly as load or stress on your cooling system does. Lastly that engine/trans/truck combo was probably never intended to run that fast over any distance. To make it better. Clean your rad and AC core. Have you changed your coolant at the specified interval with the correct distiled water and coolant? Try a test run with the hood off. If it makes it better you can put louvers or other reliefs in the hood. Have you removed or modified the air flow on the front? Missing grills and platic will upset the cooling air flow. Screen over the rad? Screen can cut air flow by over a third at speed. Bull bar? Winch? Spare mounted on the front? All very bad for cooling at speed. Internal: Thermostats can jam part way open. Remove it and test it according to the manual. Water pumps tend to pump less as tyhey get older as well as deteriorating in reation to speed the more miles they get on them. I have seen them eat them selves internaly. They work OK at idle and moderate speed and stop moving water at higher RPM. Good Luck
email STEVE MADDISON
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