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Is it ACTUALLY overheating? Check for heat at the top and bottom radiator hoses, and at both heater core hoses. If one is cold then your radiator or your heater core may be plugged and in need of a individual flush.
REPLACE THERMOSTAT IF TOP COOLANT COOLANT HOSE GOING TO RADIATOR IS HOT TO TOUCH THERMOSTAT OPEN. TO BLEED COOLANT SYSTEM FIRST YOU NEED TO ADD COOLANT TO THE COOLANT OVER FLOW JUG UNTIL COOLANT LEVEL STOP DROPPING AND STAY AT FULL COLD MARK.WAIT 3 MINUTES IF COOLANT DROPS ADD MORE COOLANT UNTIL COOLANT STAY AT FULL COLD MARK.WITH RADIATOR OVER CAP OFF CRANK ENGINE FOR MINUTE WATCH COOLANT LEVEL AT OVERFLOW JUG.IF COOLANT DROPS ADD MORE COOLANT IN THE OVERFLOW JUG.WHEN COOLANT LEVEL STOP DROPPING IN OVERFLOW JUG.SCREW BACK ON THE RADIATOR CAP TO OVERFLOW JUG.WHILE ENGINE IDLING WATCH TEMPERATURE GAUGE WHEN TEMPERATURE START CLIMBING TURN OFF ENGINE WAIT A WHILE KEEP FROM GETTING SCALDED.WHEN COOLANT COOL DOWN SOME. PLACE A LARGE RAG OVER THE COOLANT OVERFLOW JUG OPEN CAP LITTLE AT A TIME UNTIL PRESSURE RELEASED, THEN REMOVE CAP ADD MORE COOLANT IN THE OVERFLOW JUG TO THE FULL COLD MARK.THEN REPEAT THE PROCESS SCREW BACK ON THE COOLANT OVERFLOW RADIATOR PRESSURE CAP.THEN START ENGINE WATCH TEMPERATURE GAUGE WATCH COOLANT TEMPERATURE GAUGE WHEN COOLANT TEMPERATURE START RISING TURN OFF ENGINE AGAIN WAIT UNTIL ENGINE COOL DOWN ENOUGH TO KEEP FROM GETTING SCALDED TAKE PLACE LARGE RAG OVER RADIATOR CAP WHICH IS THE COOLANT OVERFLOW JUG CAP OPEN CAP LITTLE AT A TIME UNTIL PRESSURE RELEASED ADD COOLANT UNTIL AT FULL COLD MARK. WHEN YOUR COOLANT LEVEL STOP DROPPING.AND TOP RADIATOR HOSE VERY HOT THERMOSTAT OPEN AND AIR IS OUT THE COOLANT SYSTEM. MAKE SURE YOUR COOLANT OVERFLOW JUG HAS COOLANT IN IT,WHEN ENGINE COOL DOWN CHECK COOLANT OVERFLOW JUG KEEP COOLANT LEVEL AT FULL COLD MARK.BECAUSE IF OVERFLOW JUG IS EMPTY THATS A SIGN RADIATOR COOLANT LEVEL LOW.WHEN OVERFLOW JUG EMPTY IT WILL ALLOW AIR GET IN THE COOLANT SYSTEM AND CAUSE CAR TO OVERHEAT.WHEN REPLACING THERMOSTAT ALSO REPLACE THE RADIATOR CAP ON THE COOLANT OVERFLOW JUG.
That's what's happening. Have you had any work done recently that would involve the coolant having to be drained? If so you may have air in the system. Click my screenname and go to my Tips and Tricks to see how to burp air from the cooling system. If it's not that, you may have clogging in the radiator (at temperature, part of the radiator will feel cool), low coolant (add some), or a stuck thermostat (if burping the system doesn't work and you still overheat, take off the radiator cap when the car is cool and drive that way - it should stay ok). Also if the thermostat is stuck, the lower radiator hose will be cool when the upper is hot. Last cause would be a tear in the head gasket between a coolant galley and a cylinder - a compression check would show this.
check coolant level, you may have air trapped in the system.
Also, is car engine warming up to normal range on gauge? IF not, change thermostat.
Loosen the radiator cap when cold. start car, let engine warm up and see if you get a burp of air out. Fill radiator as it cools.
Have you burped the system? If air gets trapped it can prevent the thermostat from opening and make your engine overheat. To get the air out, start with a cold engine, turn the heat on vent or floor only and run full blast, run the engine with the radiator cap off until it gets to operating temperature. Keep an eye on the coolant level and add as needed until it doesn't drop in level for five minutes. Some cars may require removal of the thermostat so you can drill a small hole in it to allow air to escape from the engine side of the thermostat. Keep any eye on the temperature gauge to make sure you don't over heat it while trying to burp it.
Follow the lower radiator hose back from the radiator to the engine. Where it attaches is the thermostat housing. Open that up, remove the old thermostat, put the new one in (there's a small bleed valve on the face of the thermostat -that needs to be at the 12 o'clock position), reassemble, and then burp the cooling system (click my screenname, go to Tips and Tricks, and follow the burping instructions there).
you could have an air pocket in the cooling system that has to be burped. With a cold engine, park uphill and leave the radiator cap loose. Fill radiator and coolant reservoir. Start engine with cap loose and run at 1500 rpm until temp gauge reads normal. Feel if top radiator return hose from engine to radiator is hot. If yes, coolant is flowing and thermostat is open. If cold, thermostat is not staying closed until engine is hot.
the temp is controlled by a blend door near the heater core and A/C evaporator core deep inside the dash, the blend door has an electric motor called a stepper motor, it has failed, so whenever the door was when it failed is where it will stay, in your case cold air position, to change this part the dashassembly must be removed.
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