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Re: electric fans runs after car is shut off, drains...
Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.
If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).
If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.
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depending on the engine temperature the fan is supposed to remain on after you turn the engine off, until the engine reaches a preset cooler temperature. when it reaches cooler temperature usually within 5 minutes or so it should cut off... if you cut it off and it is running 30 minutes later.. then there is a problem with the fan relay or temperature sending unit.
You have an electric cooling fan - this is normal for this to occur. Do not be alarmed. The fan is controlled by a thermostat. If your fan continues to run after 20 minutes then I would trace the wires, and check the connections to the thermostat. Verify the reading across the terminals are out of spec before replacing it. First, time the fan to see how long it runs for - just sit there and look at a magazine while you wait - it shouldn't be that long. When you hear it stop, look at your watch. If it's more than 20 minutes (I sincerely doubt it will run that long) then trouble shoot the thermostat as mentioned previously.
The cause is most probably a current drain on the battery when the vehicle is switched off.
Check for a drain current from the battery while the vehicle is standing with engine and all electrical system turned OFF - [ while in this condition, if you don't have a current meter, temporarily connect a small bulb (6-12W) in series with the main battery ground cable - lamp glow indicates current drain - remove fuses, disconnect items to identify cause of current drain],
Also check alterator output voltage (measured across the battery terminals) is approx 14.5V when engine is running and electric system is loaded with headlights or blower fan on.
Hi Scott, The electric fan should run, for a few minutes or more depending on how hot the cooling system is. ( normal ) I would suspect that the problem is the battery, Or the terminals are corroded or loose. Have it checked under load, Any auto parts store will do it for free. Heat and vibration are the most common cause of battery failure. Unless you are constantly draining it all the way down, with a car stereo. or some other voltage drain. The average lifetime of a battery is actually about two or three years, Less in hot climates. Good luck and Keep those Jumper Cables handy till you get it diagnosed. Regards paul
What initiated the need for jump starting? Is the alternator charging? Has the battery been checked?
To check the alternator, once the engine has been jumped and is running, remove one of the battery post connections. If the engine dies, the alternator is not charging the battery, and the symptoms you describe are the on-board computer going through low voltage spasms until sufficient electrical power to operate the engine / tranny is drained and the car dies.
If the car continues to run with no battery attached, the alternator is charging - - - and I would recommend removing the battery and having it checked and (if good) recharged to full capacity. I would also recommend having it charged even if the alternator is the problem just to delay the onset of the low voltage problems. The car should operate normally for a few miles before the battery drains too low after a full recharge, enabling you to get it to a shop for alternator service / replacement.
If you attempt replacing the alternator yourself, make sure the battery is disconnected prior to starting the job. Saves blowing up good stuff by accidental short.