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SOUND LIKE COOLANT FANS HAS A FAULTY THERMO SWITCH LOCATED AT THE BOTTOM OF THE RADIATOR ON LEFT HAND SIDE.CHECK THE FUSES 8 IN THE ENGINE COMPARTMENT AND CHECK FUSE 16 IN THE PASSENGER COMPARTMENT FUSE BOX.WHEN ENGINE OVERHEATING IF BOTH COOLING FANS WORKING.OVERHEATING PROBLEM COULD BE BLOWN HEAD GASKET.CHECK ENGINE OIL LOOKS LIKE MILK HEAD GASKET LEAKING.SEE WHEN YOU DRIVING LOW AND HIGH SPEEDS THE COOLING FANS SUPPOSE TO BE RUNNING.IF THEY NOT RUNNING THAT IS YOUR OVER HEATING PROBLEM.
Replace your overflow tank cap. This is a small problem that a lot of people overlook and end up replacing everything. What happens is the heated water and engine heat causes the seal to break down, and overtime the cap/seal can no longer hold pressure which causes the car to have a high temp or over heat. It will also cause you to lose coolant sometimes if you find yourself refilling on a regular basis. Try a new cap or have yours pressure checked at a local store. A new cap is $7-$12
clogged radiator? bad water pump...cooling systems are quite simple...water circulates through the engine under the force of the pump...even if the thermostat is working it still needs the pump to move the water...still have the old thermostat? put it in a pot of cold water on the stove and turn on the burner...see if it opens at the proper temp setting...if the old one does you dd not need a new one..oh, I have installed brand new thermostats that were bad...
check for air bubbles in the system also check the pressure cap and have it tested also squeeze the upper radiator hose together and if it doesn't open up in your hand right away the water pump could be weak work on getting the air bubbles out first before going to the water pump