First check to make sure the fan isn't locked up, disconnect the neg battery terminal then see if you can turn the fan by hand if you can, look in the under hood fuse block for a blown fuse if they're good check the fuse panel under the dash for the same thing if OK locate the fan relay in the under hood fuse block and swap it with one of the same number in the block. The coolant temperature sensor may also be bad after that you'll need a scanner to locate the problem. I hope this helps. Take care.
SOURCE: 99 DODGE STRATUS RADIATOR OVERFLOW BOTTLE
Double check that your rad cooling fan is operating as it should, but after that, I'd be looking at a good rad flush, or rad replace. Believe it or not, your heater core is like a small rad, and when you turn the heater on, it actually cools the circulating coolant, slighly,and therefore shows a difference on your gauge. Like I said, make sure the rad fan is coming on when engine temperature is at normal or slightly higher, and if it is, then I'd be taking a close look at my radiator, especially if it wasn't replaced when headgasket was done.
SOURCE: 1996 Pontiac Grand Am / Overheating
likely you have a blown head gasket or crack in head. Though common, this condition does not always show up in engine oil. To verify, have a shop do a hydrocarbon test on radiator.
SOURCE: 4.6 lit cadillac overheats although I replaced the thermostat
did you try replacing the radiator cap and the temp sensor?
SOURCE: 2004 hyundai sante fe is making coolant boil back
I take it this only happens when the vehicle is stopped & idling? If not, check radiator & hoses for blockage (since you've already replaced the thermostat & top hose) - repair/replace as needed. Next, check the coolant temperature sensor's operation (there are two sensors - one for the temp gauge on the instrument panel, the other is used by the ECM (PCM). If that one is malfunctioning (i.e., telling the computer that the engine coolant temperature is less than it actually is, The ECM (PCM) it won't turn on the cooling fans.
Since you didn't specify which engine you have (i.e., 2.4, 2.6 or 3.5), Photo locations of all three are included here.
Hope this helps.
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