Question about 2003 Kia Sedona

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I have a 2003 KIA Sedona and it is overheating after about 5 minutes of driving. Coolant reserve levels are normal and I checked the radiator and it appears to be full. Any idea as to what the problem could be? Maybe the thermostat or water pump? Thanks!

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If you are not losing coolant the first things to check are if the fan(s) are engaging and if the thermostat is opening. Start the engine cold and monitor the temperature as it warms up. As it starts to get hot, Gently and carefully grab the upper radiator hose. If it is cool to the touch but the engine is hotter than normal the thermostat is stuck closed and needs to be replaced. At the same time listen and watch for the cooling fan to engage. You should have 2 electric cooling fans. One works off of coolant temperature and the other off of accessory load. Turn on the a/c during this test with the temperature setting on hot. This way you can see if the fan is working while you check the thermostat operation and the fan will engage and help cool the engine if it is operating properly. Feel the hose for breaks in the coolant flow, if the thermostat opens, to detect if air pockets are present in the system. if you have never opened up the cooling system for repair, there should not be any air in the coolant.

Posted on May 27, 2010

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Start with the easiest things first. Check coolant level, if it's low you need to find out why. If it's at a normal level you know the coolant is not circulating through the motor. To test this run the car to temperature then feel the upper radiator hose, it should be hot and firm to the touch. Next feel the lower radiator hose it to should be hot and firm to the touch. If it's not the coolant isn't flowing through the motor which is the result of a stuck thermostat.

If the thermostat checks out ok crawl under the car and check all the connections between hoses/motor/radiator. Look at the side tanks of the radiator. If there's a carack in one they will only leak while the system is under pressure. Next check to make sure the water pump is circulating the coolant and not leaking. A siezed water pump will usually stop the pulley from turning resulting in a broken belt.

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2003 Hyuandai Elantra after driving for about an hour is it common for you engine to feel very hot? Please advise


After 5-10 of driving the engine temp. should be at 195-210 F.

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When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

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Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

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MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

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Please post more information by clicking the comment link on the top right corner.

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1 Answer

2002 KIA Sedona Overheating


most likely, replace thermostat .

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