Make sure air flow to the radiator (through the A/C condenser) is unobstructed, that fan is coming on when it should and that the thermostat isn't stuck part way open. Also, can be caused by the beginning of a head gasket problem. (hydrocarbon test at radiator will show that) Rare, but can happen, ignition module may be bad.(usually also changes engine performance a bit as well)
I listed these items in order you should look at them.
Good Luck
You may have a bad thermostant, or cooling fans arent working, could be a sensor or fan is bad, trun on a/c is if fans trun on, is yes then start with thermostant. hope this helps.
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