Engine Cooling problem
2004 Kia Optima 4 cyl Front Wheel Drive Automatic 64000 miles
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While the car is moving the temp gage does fine. I drove over 2 hrs without it over heating. But when I come to a red light and have to sit for a while it starts to go up, and if I have to wait very long it goes into the red. One mechanic told me the cooling fans not working but when I turn the car on both fans are going. He said it could be the low speed working but not the high speed. From the radiator there are 2 hoses one from the top going to the top of the engine and one from the bottom going just below the top, from this hose where it connedcts I found white dry spray and later on found antifreeze below this connection. Could this problem be caused from my thermostat?