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2014 Kia Sorento - Page 4 Questions & Answers
Why does the transmission oil gets heated when the vehcile runs for 100+km at a stretch? The smoke can be seen from under the hood. The gearbox went through a complete overhaul recently so the gearbox
Hi there,
Transmission fluids gets hot because of the mechanical friction associated with interconnected gear rotation. The harder the transmission works, the more friction is created; in turn more heat. Transmission fluid breaks down from use; heat accelerates this degradation. When oild degrades it provides less lubrication, in turn resulting in more friction and more heat.
Average transmission fluid should run close to 200 degrees Fahrenheit, but based on loads can run as high as 350 F. Sustained high heat will break down the oil faster shortening useful life.
I would check the transmission fluid colour: red is good, brown is dirty, black is burnt. If your transmission is burning (smoking) then the oil will show it.
Engine crankcase oil also gets hot, and can burn. Check this oil for the same indicators.
As noted by Andrew, a simple leaking gasket could be causing a drip leading to burn off.
2008 Kia Sorento, when you apply the brakes at
It is difficult to say what the problem is with any certainty without being able to see the vehicle.
The driveshaft in this vehicle is not considered to be a serviceable part- in other words the proper repair procedure is to replace the driveshaft if there are any problems with it. If someone has lubed it up and that seemed to have temporarily "fixed" the problem, then you might just need a new driveshaft as this will not be a permanent fix.
Before replacing an expensive driveshaft, though, I would carefully check the brakes for loose pads moving in the brackets or dry slide pins in the calipers as these things can sometimes produce sounds which mimic a driveshaft noise and can sometimes even fool an expert.
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