Question about 1998 Kia Sephia

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'99 Kia Sephia overheats and coolant boils out...

My '99 Kia Sephia overheated a few times and the coolant boiled out at the end of my trip and when I parked. I flushed the engine cooling system, changed the thermostat and the coolant. The problem didn't go away. I inspected the water pump and it seems to be working properly. Upon further inspection, I noticed that the fans didn't turn on no matter how hot the engine got. I tested the fans by hooking them directly to the battery and they work fine. The just don't turn on when they are supposed to. I will change the relays, the Intake Air Temperature sensor and the radiator cap. I don't know what els to do. I'll report back when I make the repairs.

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  • kelvinjwalla Jul 04, 2009

    One thing that you asked was key to helping me fix the problem. You asked if the fan runs when w/ the a/c on. When I checked, one of them did (the one on the right side). I later learned that was the condenser fan. The other was the cooling fan. Since the condenser fan worked, I switched the relays and fuses for both fans and saw that the condenser fan still worked even with the non-working fan's relay and fuse. So the relays and fuses were ruled out. I thought it might be the Engine Coolant Temp. sensor, so I bought a replacement at Autozone for 40 bucks and replaced it. It was a pain in the butt because I had to get the right length 3/4 socket to fit around it to get it off. So after changing the coolant, the sensor, and the radiator cap, the fan still wouldn't come on. Then something occurred to me - try disconnecting the problem fan and reconnect it. As I pulled on the connector wire, the fan started and stopped. I wiggled the wire and the fan went on and off again. I finally realized the problem. The connection had a short. After fixing that by splicing and reconnecting the wires without the plastic connector harness, the fan now works just as it should. The temp stays at the proper level and the car does not overheat. Problem solved. Thanks for pointing me in the right direction. I only wished I tried that before it spent all that cash and time on antifreeze, sensors, caps, and tools.

    All the best!!!

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Rplace coolant temp sensor,and bleed all air out of coolant system ,fan relay checks and fuses check is good,,do fans run with ac on? if they do ,fuse and relay most likely ok but check relays any way

Posted on Jul 04, 2009

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Hey, my car is experiencing the exact same thing. i did everything you've done, and i found that the fan motor relay is causing my problem, i jiggled it around and it the fan started to work. I then saw that the wire from the car into the relay was a little damaged and burned. fix the relay and it should be okay. that's what I'm going to do today.

Posted on Jul 26, 2009

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I drive a Camry V6 3.0L Every time I top up the coolant to the recommended level and after driving the contents in the reservoir boil over and spill out.


There may be a slight head gasket leak to the coolant jacket, not large enough to overheat the engine. It is normal for some coolant to escape at operating temp, but not lots, and it should cool down to about the recommended level again.

Something is pressurising the coolant jacket. Have it tested for the presence of combustion gasses in the coolant. This is a simple test.

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