Once at optimum temperature, the thermostat controls the flow of engine coolant to the radiator so that the engine continues to operate at optimum temperature. Under peak load conditions, such as driving slowly up a steep hill whilst heavily laden on a hot day, the thermostat will be approaching fully open because the engine will be producing near to maximum power while the velocity of air flow across the radiator is low. (The velocity of air flow across the radiator has a major effect on its ability to dissipate heat.) Conversely, when cruising fast downhill on a motorway on a cold night on a light throttle, the thermostat will be nearly closed because the engine is producing little power, and the radiator is able to dissipate much more heat than the engine is producing. Allowing too much flow of coolant to the radiator would result in the engine being over cooled and operating at lower than optimum temperature, resulting in decreased and increased exhaust emissions. Furthermore, engine durability, reliability, and longevity are sometimes compromised, if any components (such as the bearings) are engineered to take into account to fit together with the correct clearances. Another side effect of over-cooling is reduced performance of the cabin heater, though in typical cases it still blows air at a considerably higher temperature than ambient.
If you see bugs or dirt clogging the fins, hose down the radiator with a garden hose and spray nozzle. If that doesn't solve the overheating problem, check the condition of the radiator coolant. With the engine cold, remove the radiator cap and examine the coolant. After twisting off the radiator cap, if what you see looks brown, muddy, rusty, or has debris floating in it, you've most likely got a clogged radiator. Before replacing the radiator cap, you can try cleaning the radiator. You can do that with a radiator cleaning chemical and a cooling system flush. Put the radiator cap back on and see if the overheating has stopped. If that still doesn't do the trick, no doubt the system is so corroded and plugged, the only option left is to replace the radiator. Don't forget to check for coolant under your car in case there's a radiator leak.
Replacing a radiator isn't difficult, but you'll need a special transmission cooling-line removal tool to dislodge automatic transmission lines. Check out the Advance Auto Parts tool selection or our Loaner Tools Program for the correct removal tool for your vehicle.
Where should you go for quality auto parts for all your vehicle maintenance needs– including aftermarket radiators and aluminum radiators? Advance Auto Parts.
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Reducing is a major goal in aircraft design, including the design of cooling systems. An early technique was to take advantage of an aircraft's abundant airflow to replace the honeycomb core (many surfaces, with a high ratio of surface to volume) by a surface mounted radiator. This uses a single surface blended into the fuselage or wing skin, with the coolant flowing through pipes at the back of this surface. Such designs were seen mostly on aircraft.
The approach goes way beyond just running water channels through the frame and circulating water through them, since that wouldn’t have solved the problem of needing to place a radiator in there somewhere. The researchers instead decided to try a passive technique, allowing the water to seep out through the frame around the motors to cool them evaporatively. In other words, Kengoro sweats.