Ka's are temperamental. First check your oil and water and make sure they aren't contaminated with each other (water/coolant + oil = chocolate milk...also look to see if there are any oil rainbows in your water, good indication if you are about to have a hg go.). Next do a compression check and leak down test. Then check the sensors. Water pump and or thermostat could be a likely candidates as well. Lastly check you radiator for build up or just replace it all together. 240 owners are plagued with what previous owners did or didn't do to their cars.
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-Retired
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