Question about 1999 Volkswagen Passat

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Electric fans runs after car is shut off, drains battery

2002 rabbit, 2.0 liter engine, electric fan continues to run on after car is hut off, seems to run on for 20 minutes and my battery is always drained, battery is new

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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.

A.

Posted on Nov 29, 2008

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When I turn the engine off the engine cooling fan stays on and does not shut off


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.

Sep 28, 2015 | 2009 Dodge Grand Caravan

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What causes fan to continue running when engine is off and the battery is drained


it could be a faulty fan relay, however some of these had a continue run time program that allowed the motor to cool off after engine shut down. it shouldn`t run longer than about 2/3 minutes.

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Fan relay switch


The fan relay could be defective, especially if the fan continues to run after shutdown and drains the battery.

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I have 2003 Mercury Grand Mrq. the fan is not shut down when I shut down the car; it keeps running consuming the battery in the car, there is a kind of electrical connector next to the fan upper right...


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.

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How to change the radiator fan?


Electric Engine Fan - Fan Switch

Removal & Installation
2.7L Engine
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Disconnect the electrical connector .
  4. Remove engine coolant sensor from coolant outlet tube .
To install:
  1. Apply thread sealant to sensor threads.
  2. Install engine coolant temperature sensor into coolant outlet tube.
  3. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  4. Connect electrical connector to engine coolant temperature sensor .

3.2L And 3.5L Engines
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. With the engine cold, disconnect coolant sensor electrical connector.
  4. Remove sensor.
To install:
  1. Install engine coolant temperature sensor.
  2. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  3. Attach electrical connector to sensor.
  4. Connect negative battery cable.
Removal & Installation
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Remove upper radiator hose.
  4. Disconnect cooling fan electrical connector.
  5. Remove cooling fan mounting bolts.
  6. Remove radiator cooling fan assembly from vehicle.

    f9d971c.jpg
    Fig. Removal and installation of the radiator fan-2.7L Engine shown
To install:
  1. Position radiator cooling fan assembly in vehicle.
  2. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
  3. Connect cooling fan electrical connector.
  4. Install upper radiator hose .
  5. Fill cooling system.
  6. Operate engine until it reaches normal operating temperature.
  7. Check cooling system and automatic transmission for correct fluid levels.

Hope helps (remember comment and rated this).

Jul 13, 2010 | 2001 Dodge Intrepid

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Have tried 2 new batteries. car starts at once. runs smoothly. but when ignition is switched off for about 30 minutes, the battery goes dead! The alt. has been checked OK. The problem started when we...


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.

Oct 28, 2009 | 1994 Toyota Camry

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Fan won't shut off


Remove the negative battery cable. Otherwise, it's going to run down your battery.

Oct 10, 2009 | 2002 Chevrolet Cavalier Coupe

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Radiator Fan continuously running with engine off, discharging battery


It is not the fault: for long time Renault has that concept, that is to prevent engine oveheating when coolant circulation is suddenly stopped.

Radiator fan can continue to work up to 10 minutes after engine is off. You should worry about it only if it wouldn't stop even after 10 minutes.

Oct 12, 2008 | 2000 Renault 181

4 Answers

Fan continues to run/Battery goes dead


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






Jun 13, 2008 | 1999 Volkswagen Passat

1 Answer

Seems to be electrical problem


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.

Hope this helps and good luck!

-WB.

Jun 12, 2008 | 2002 Mazda Tribute

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