Question about 2003 Kia Sedona

1 Answer

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!

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 343 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2003 kia sedona ex heat not working

If the engine temp rise while sitting at lights then you have an air flow through radiator problem. Electric fans not working or viscous fan hub is faulty. high heat except at speed may indicate an air lock in the cooling system or coolant level in the radiator. Check at radiator cap not the reservoir.

Nov 30, 2013 | Cars & Trucks

1 Answer

Ac blows hot air in kia sportage

A/C BLOWS HOT. Radiator in Kia is rather small it overheats quickly. I should have checked the simplest thing first which was the radiator coolant level. I had a slow leak in radiator it was losing coolant but not very noticeably. I initially took it to have the a/c system checked all was good,they referred me to an electric repair shop but all the fuses and relays were good. I don't normally check coolant level as it is checked by dealer when oil is changed,this is a 2nd car and I don't drive it daily. Since coolant level was dropping slowly the engine would not overheat,however coolant got low enough to trigger emergency a/c compressor shut down switch to keep engine from overheating. That's why a/c would cool for 10 mins. in the morning but then shut off. Simple fix I filled the radiator and overflow tank. A/C started working perfectly again. After doing this a few times I realized the radiator had a leak which eventually had to be replaced $700.00 parts and labor. Its all good now.

Apr 11, 2013 | 1999 Kia Sportage

1 Answer

My kia sedona 2003 is overheating is it the water pump

Probably not the water pump. The most common cause is rusted out/leaking underbody heater rear heater lines. The steel portions of the lines rust and leak coolant. The low coolant level will cause the engine to overheat. If overheated repeatedly these engines will usually warp the cylinder heads. This will cause severe overheating and may damage the radiator and other components due to combustion gasses entering the cooling system. A cooling system pressure test should be done to check for external leaks, and a block test can be done to check for the presence of combustion gasses entering the cooling system.Make sure to check coolant level in the radiator when cold, NOT in the reservoir on the inner fender. This could also be caused by something as simple as a thermostat or radiator fans that aren't working.

Jan 09, 2013 | 2003 Kia Sedona

2 Answers

Will it cause problems if the radiator overflow bottle is broke? and what is the signs of a bad radiator thermostat?

Yes, it will cause coolant to leak and allow air into the cooling system. This can cause engine damage. Signs of a bad thermostat are the engine overheating, or overcooling.

Mar 06, 2011 | 2003 Kia Sedona

1 Answer

My kia van hardly has any heat but the temprature gage says normal whats going on

The first thing you should do is to check your coolant level and check for leaks. I assume you mean the internal heater isn't getting very hot-If the temp gauge is reading correctly and there is no engine overheating then the thermostat and radiator is working correctly, so if the coolant level is OK there is either an airlock or the heater matrix is blocked or the heater valve is not opening. You will need to have the system pressure tested at a garage. In any event it will probably need to be drained to fix the problem. I hope I have been of help but please do not hesitate to ask if you have any further questions.

Feb 19, 2011 | 2003 Kia Sedona

2 Answers

The car is overheating

Check to see if the radiator is full (when engine is cold) Make sure you can hear the Thermo fans running when at normal operating temperature. If all that seems fine, replace the engine thermostat.

Nov 22, 2009 | 2007 Kia Spectra LX Sedan

2 Answers

Overheating 94 tercel

Overheating can be the result of several things including: No coolant, stuck thermostat, cracked head, blown head gasket, bad water pump, cracked radiator side tanks, and poin holes in one or more hoses.

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.

NExt look around the area of the head gaskets for signs of leakage, again this will only leak while the system is under pressure. Check the oil, if it looks milky there's coolant in it which is a sure sign of a gasket failure or cracked head. Good luck.

Nov 01, 2009 | 1994 Toyota Tercel

2 Answers

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.


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

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


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

This test will kill two birds with one stone.




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


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.

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

DON'T FORGET to RATE ME if my tip is helpful to you!

Aug 14, 2009 | Hyundai Motor 2003 Elantra

1 Answer

2002 KIA Sedona Overheating

most likely, replace thermostat .

Apr 14, 2009 | 2002 Kia Sedona

Not finding what you are looking for?
2003 Kia Sedona Logo

757 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kia Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

80668 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Kia Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides