My car is overheating


Asked by Aug 30, 2015 at 02:52 PM about the 2012 Kia Optima LX

Question type: Maintenance & Repair

replaced the radiator, the radiator cap, thermostat. Everytime the car heats up the coolant would boil and push the coolant out from the container. We checked the water pump and fans, everything ok...When the car is started, it blows out cool air, and the radiator hose on the right side is really hot. Seems its not curculating....we dont know what else it the problem? The car is 2012 Kia Optima LX

7 Answers

Sterling Grinnell

head gasket. how soon after starting it from cold does it blow coolant out of the radiator? take the cap off and top the fluid off and start the car see if it pushes the fluid out right away if so look at head gasket or head being warped. other thing you can do is pull the cap off the radiator and with out running it give it a sniff see if you smell exhaust if not start it let it run for a cupple secounds and then smell it again.

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its cold right as soon as the car is started. what type of fluid? i been using the 50/50 Prestone...i think its the wrong one. it doesnt push the fluid out, takes about 30 minutes to.

Sterling Grinnell

ok the 50/50 is fine but you might want to call a parts house and see if it should be using a dexcool rather then conventional antifreeze. if it takes 30 min for this to happen what I want you to do is fill the radiator up put the cap on it start it and run it till it gets warm check to see if you can feel it if the bottom raddiator hose is getting warm. thinking you might have a thermostat that is bad and not allowing circulation. this would also cause the heater hoses to stay cold

Sterling Grinnell

if it starts getting close to the hot line shut it down see if the hose on the bottom is still cool it should be hot by now and well as hot as the top one.


if everything dont go the way it should, what would be the problem? If it were the heads, then how does that get placed.?


if there is no circulation of the coolant, you could have a bad temp sensor and/or a bad water pump. The water pump impeller can be damaged to not create enough flow thru the engine.


sounds like you have air trapped in your heater matrix, remove radiator cap and fill with coolant start engine and run till hot with heater lever in hot position squeeze water hoses that come from bulkhead too engine block, you should see air come out through top of radiator, when all the air has finished switch on heater blower to check heater is hot this should cure your fault

1 out of 1 people think this is helpful.

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