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The cooling fans are supposed to run any time the a/c is on in order to keep air flowing across the condenser. Your a/c will not work properly at idle if they quit.
This is normal and there should even be a warning label near the fan shroud. It is cooling the radiator and as long as it eventually does go off there is nothing to worry about.
There may be a problem but some cars keep the radiator fan running after motor has been turned off to help cool the engine. My car uses this system but if it is cool out (below 60 degrees) it will not keep the fan running.
Is the cooling fan running? If so, drain the radiator with the heater control set to hot. Install a new thermostat, and fill the system with a 50/50 mix of antifreeze and distilled water. Bleed all air from the system by using bleeder screws if equipped, and by starting the engine with the radiator cap off radiator full. Watch for escaping air bubbles and keep the radiator full. When you see no more air escaping put the cap back on. If the fan is not running then that is your problem. Turn the A/C on and the fan should run continuously. If it does not the fan motor is more than likely bad. Check the fuse for the fan. If it is good, Apply 12 volts directly to the fan motor to check it. If it runs then replace the thermal relay.
some models will allow the fan to continue to run after the key is turned off Check to see if there is a sticker somewhere near the radiator that says "fan may start at anytime even when engine is not running"of something like that.......if not it is probably the fan sensor switch.........they are usually either in the intake manifold or sometimes in the radiator.(also in the housing near the thermostat)
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