About 4 months ago my 2004 Kia Optima stating intermittantly overheating while driving. It did, however, blew a head gasket and radiator several weeks after that. The dealership repair the engire and replaced the radiator, but the car still overheats. I took it back to the dealership and that advise to replace the radiator hoses. I replaced both radiator hoses, timing belt, driving belts, and checked all of the fuses as well, but I still have the same issue of overheating. This issue occurs only when I have the A/C running and I make short stops like at red lights. When the A/C is not running, the call runs just fine without overheating. What could be the problem?
Engine Overheating on 2004 Kia Optima
you have cooling fans that assist cooling that have to wor. when the ac is on, the fan must operate or the ehat from the condenser will cook the radiator and cause an overheating situation.
There could be a flow problem, you may need to flush the radiotor, replace or check water pump or jacket, just some theories.