My 2003 hyundai accent is over heating I replaced the thermostat the belts are fine Im not sure what else it could be

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HI If all fuses are fine,EML warning light in cluster not on, The problem aria in these models were IGNITOIN COIL PACK ,CRANK SENSOR and make sure that ENGINE TIMMING BELT has not broken. BE advised that a diagnostic check will be required .

first before you change the rad check your thermostat and try to flush your system and check if you got leak aroud the w/pump.

your temp mark will also depends on your thermostat range anywhere between say 90 and say 180 if your temp goes in the red then you should be concern

take out the old thermostat and back flush the system.check the water pump for any leaks and for any perished hoses.then refill with antifreeze with a 50/50 mix.any problems will obvious as/when you get to them (the radiator for hyundai is week by the way around the top join.as it is soldered.)

Do you have a digital camera? Take pictures of your engine bay,especially the belt routing and save them to your computer for later viewing.
Next push down on your belt with enough pressure to see which pulley arm moves.This is your tensioner,if you put a box end wrench on the bolt of that pulley you can push down on it and release the tension on the belt for removal.
Then look at your pictures as to how the belt was originally installed.You'll need to move that tensioner enough to replace the belt.After replacing the belt make sure it's on 100% before starting the engine.

If the water tends to keep going down then there has to be a leak somewhere. Try also looking at the hose coming from the overflow tank and see if the hose might be kinked. You might also be blowing antifreeze out the tailpipe. Take a look and if there is bluish white smoke then you have confirmed that theory,

Check the coolant level, do this with a cold engine. Or if you have recently used it. let it cool down for about 25 minutes before removing the radiator cap. if it is low, refill with coolant. If it does not, check your thermostat. Or better yet replace your thermostat. Be sure to get the right one . the same degrees as your old one. Just ask the teller to give you one for your engine size and car Model.And year.See where the radiator cap is. Then drain some coolant to where it will not spill from the radiator cap. Remove the hose nearest the radiator cap and you will get to the thermostat housing. Remove the housing and note how the thermostat is placed. Take of the thermostat housing and the old thermostat. Clean the housing and around the hole where the thermostat goes of any deposits. Get some grease and cover the new gasket with grease on the housing to hold it in place. replace the New thermostat and make sure it is flush with the engine and the housing. If it is off , you could break the housing upon tightening the housing.replace the hose and refill with coolant slowly to eliminate any air spaces.. Also check the coolant reservoir and fill it to the indicator line. Restart the car and chek for any leaks. Then check the heater after the engine heats up. If that does not do the job it could be the temperature sensor or the heater core.The heater core will take more time to check and clean or replace.

first thing i need to know is did the timing belt break?
second is are you sure you aligned the timing marks and after the belt tensioner was tight you rechecked to make sure the timing stayed where you had it.
next step would be a compression check to if a valve was bent whenchanging the belt
i have seen this happen and this engine is an interferance engine.
later paul