Have you checked the water pump? Also, you may want to check the oil to ensure no water is getting into it. This would be a milky color oil which would indicate a bad head gasket or head. Is your radiator fluid staying at the full level or are you losing fluid? if all of this looks good, you may have air in the system. You can google or search on youtube for ways to clear the engine of air in the cooling system.
Check that the cooling fan comes on....could be relay temp sensor fuse? make certain the air is out of the system. make certain the radiator and over flow is full of coolant.
lastley the radiator could be dirty.
How long before it overheats...it's overheating all the time...stop and go and highway?
SOURCE: Car overheating
there should be a cap some where but if not there should be some sort of hose coming out of the top of the radiator pull the hose and fill it up from there, and top it all the way off, make it spill, all the way full! and when an engine over heats it usually ruins the thermostat so i would recomend replacing it also
SOURCE: 2005 Hyundai accent overheating, radiator
A car can overheat for a lot of reasons.First make sure this is the problem by checking the radiator hose or water level. Open the radiator cap when the car is cold, crank it, and then watch the water level. If it drops when the car warms up this is not the problem.
The tools you will need will depend on what you have to take off to get to it. If you can access the thermostat you should only need a ratchet or wrench to remove it and something to scrape off old gasket with.
Location:The thermostat should be inside the thermostat housing on the motor. Follow your top radiator hose to the place where it goes into the motor. There should be a sort of dome shaped housing there with probably a bolt on either side of it.The thermostat is inside that.
This is a reasonably easy job, but shouldn't be done carelessly. It's also kind of messy.
When the car is cold remove the bolts from the housing with a ratchet. Lots of coolant and water will drain out. But the thermostat will be visible.Pay attention to which side of the thermostat is up.It should just lift up. Remove all the old gasket from around the area and clean it up well. Replace the thermostat and gasket then the bolts. Be very careful not to over tighten the bolts or the housing will be ruined.
SOURCE: my car keeps overheating while it is idling.
If it's only happening while sitting at a stop light and idling, the problem is probably in the cooling fans. Turn your A/C on high and pop the hood. Check your cooling fans to see if they're running. If they aren't running, it's the fan relay. In my 99 Taurus, the high speed fan relay is located in a slim black box next to the battery, it's the large square relay right up front. Use a known working relay of the same size and pop it into this relay. If the fans turn on, there's your problem. Replace the relay. Try the same with the A/C on low, but this relay is in the power distribution box (number 31). The 2002 may have a CCRM (Constant Control Relay Module). The CCRM is an expensive part (over $100.00). You'll be able to tell because the CCRM is a very large box that is mounted next to the battery and contains relays that are not replacable. It'll have a part number followed by a large letter/number. You'll need this part number and large letter/number to order the new.
SOURCE: why is my 1998 hyundai accent overheating?
The head gasket has gone so pressure builds up in the cooling system and forces water out of the overflow
You need someone to take the head off , skim it and fit a new gasket
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