Question about 2003 Kia Optima

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I have a 2003 kia optima and evry cple weeks it overheats,ive checked the oil for signs of water and there are none and cannot find any signs of leaks anywhere from the coolant

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Try this procedure:

  • The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

  • Make sure the radiator and the overflow bottle are filled to the proper levels.

  • Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

  • Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

  • Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Posted on Apr 25, 2015

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  • Master
  • 444 Answers

Have you changed the termostat in it, Or are you shure the water pump is working (Properly) You should not leave a problem like that unatended so long It can do serious (Damage) to the engine, Like cause it to seaze up.

Posted on Nov 04, 2012


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Posted on Jan 02, 2017

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SOURCE: golf 1.6 coolant

mark 3 and 4 golfs loose water from nearside front bottom corner ov radiator ,does your heater work ok ? these cars also have water pump problems,if this is the case it pushes the water out the header tank and you wont find a leak.

Posted on Oct 19, 2008

  • 957 Answers

SOURCE: Sebring 2003 2.4l Coolant reservoir emptied

Fill the coolant system back-up to level and pressure test the system. Check for chalky, white trails, antifreeze trails, spots on the ground, and see that the pressure is holding for more then five minutes. Could be: head-gasket, freeze plug, hose, heater core, water-pump, or radiator.

Posted on Jun 11, 2009

  • 30 Answers

SOURCE: We have a 1997 Subaru Legacy overheating, we

Pretty common on subaru's, try elevating the front of the car whilst bleeding the cooling system.

Posted on Nov 23, 2009

  • 68 Answers

SOURCE: kia optima 2003 has an overheating problem

This is very vague and hard to diagnose without more detail. I have a hunch the the brakes "locking up" is a different problem than the engine overheating. To check the engine: Remove the radiator cap from the cold radiator. Be sure the radiator in almost topped off with 50/50 antifreeze & water. Start the car and let it idle until either you can turbulence in the radiator, or the engine is getting really hot. Is the water temp gauge working? You can keep an eye on it during the process. If you see turbulence then the thermostat is opening, and the water pump is pumping. The thermostat is fairly easy to replace. The water pump is lots of work. Usually the timing belt, tentioner, pulley, and accessory belt is changed at the same time as the water pump, because the labor costs more than the parts. Hopefully nobody ever put straight water into the radiator. It causes corrosion, and lots of related problems.

Posted on Jan 29, 2010

  • 1033 Answers

SOURCE: display reading top up coolant, losing water but no signs of leak

Replace your overflow cap. You usually don't see it leaking but the cap no longer holds the psi and the water comes out and dries quickly from the heat. Try replacing the cap and I think you will be surprised at such a simple problem can cause.

Posted on Jul 03, 2010

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You could also have some kind of blockage on your radiator. If there is a lot of dirt in the fins, air cannot circulate and remove the heat. Use some compressed air to blow the fins clean.

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