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Fan continues after turn off and runs battery down

Hi my car battery keeps going flat and the fan stays on. A garage has replaced the battery and found fault to be bad connection on battery and bad connection on temp switch in radiator but it is still running my battery flat. Garage has said it could need the electrics board replacing oh its golf

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  • Volkswagen Master
  • 42,159 Answers

Run fault codes to see if there is a faulty sensor .

Posted on Feb 10, 2014

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6ya6ya
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Posted on Jan 02, 2017

yotaguy
  • 232 Answers

SOURCE: The electric radiator cooling fan will not turn off

As long as the fan eventually shuts off this isn't a problem,the fan will continue to run for a bit after the car is turned off,once it reaches a set temprature it will turn off.

Posted on May 02, 2009

drsinister69
  • 2317 Answers

SOURCE: Electric Radiator Fan Does Not Come On

DTC P0480 - COOLING FAN CIRCUIT

Circuit Description

The cooling fan is controlled by PCM through the fan relay based on inputs from ECT sensor, IAT sensor, A/C selector switch, A/C refrigerant pressure switch and vehicle speed sensor. PCM controls cooling fan by grounding cooling fan control circuit which turns on cooling fan relay.

The fan relay will be commanded on when ECT reaches 223°F (106°C) or greater, A/C is requested or vehicle speed is less than 38 MPH. Cooling fan relay will also be commanded on regardless of vehicle speed when a DTC is set requesting cooling fan to be on, ECT is 304°F (151°C) or greater, or A/C refrigerant pressure is high. Cooling fan may also be commanded on when engine is not running, on certain conditions.

Conditions for setting DTC:

Battery voltage greater than 9.5 volts.

Cooling fan fault line detects a malfunction for 6 seconds.

1. Check the cooling system. Ensure coolant level and belt tension are correct. Adjust/repair as necessary. After repairs, go to step 23). If no adjustment or repairs were required, go to next step.

2. Turn ignition on, with engine off. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). If cooling fan is off, go to next step. If cooling fan is on, go to step 4).

3. Command cooling fan relay on. If cooling fan operates, go to step 23). If cooling fan does not operate, go to step 5).

4. Turn ignition off. Disconnect PCM harness connector. If cooling fan turns off, go to step 23). If cooling fan does not turn off, go to step 6).

5. Disconnect cooling fan relay harness connector. Using a test light connected to ground, probe battery feed circuits in relay harness connector. If test light illuminates on both terminals, go to step 7). If test light does not illuminate on both terminals, go to step .

6. Disconnect cooling fan relay harness connector. With test light connected to ground, probe battery feed circuit in relay harness connector. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).

7. Connect a jumper wire between cooling fan relay battery feed and cooling fan battery feed circuit. If cooling fan operates, go to step 11). If cooling fan does not operate, go to step 12).

8. Repair open in battery feed circuit. After repairs, go to step 23).

9. Repair short to voltage in cooling fan battery feed circuit. After repairs, go to step 23).

10. Connect test light battery voltage and probe cooling fan control circuit. If test light illuminates, go to step 13). If test light does not illuminate, go to step 21).

11. Connect test light to battery voltage and probe cooling fan control circuit. Using scan tool, command cooling fan on. If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).

12. With jumper wire still connected, disconnect cooling fan harness connector. Using test light connected to ground, probe cooling fan battery feed circuit. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).

13. Repair short to ground in cooling fan control circuit. After repairs, go to step 23).

14. Check terminals to cooling fan relay. Repair as necessary. After repairs, go to step 23). If terminals are okay, go to step 21).

15. Check cooling fan control circuit for open or poor connection. Repair as necessary. After repairs, go to step 23). If circuit or connection is okay, go to step 22).

16. Connect test light to battery voltage and probe cooling fan ground circuit. If test light illuminates, go to step 1. If test light does not illuminate, go to step 19).

17. Repair open or poor connection in cooling fan ignition feed circuit. After repairs, go to step 23).

18. Check for poor connections at cooling fan harness connector. Repair as necessary. After repairs, go to step 23). If connections are okay, go to step 20).

19. Repair open or poor connection in cooling fan ground circuit. After repairs, go to step 23).

20. Replace cooling fan motor. After replacing cooling and motor, go step 23).

21. Replace cooling fan relay. After replacing relay, go to step 23).

22. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.

23. Turn ignition on, with engine off. Command cooling fan on. If cooling fan operates, system is okay. If cooling fan does not operate, repeat step 1).

Posted on May 16, 2010

robbo1655
  • 1 Answer

SOURCE: Smart Car has Readout of 3 horizontal lines with gear selection

Hi there I just had a similar thing happen to me drove up the motorway and just as I came off at WSM I couldn't find any gear. The dredid 3 lines came up on the dash and a grinding noise from the back. I had to get the rescue service to take me back down to cornwall and dropped it at the garage. Just got it back the garage said they could not find the problem but they flushed the oil and fluids and bobs your uncle. Only time will tell if its ok but they did say sometimes the gears can stick and it just needs cleaning through. Is this true I don't know but all seems good now just makes me wonder it can happen again. It's got full service and was serviced last 2 months ago 53 passion. I did hear and read its common for the selector to go but I don't know anyone else with a smart car to ask. Anyway that's my woes I hope this anyone in a similar situation.

Posted on Nov 18, 2013

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1 Answer

I have a 2012 Kia Sorento and the cooling fan will not shut down. Ishut the engine off and it has been running for 30 minutes. Now it has run down the battery down


There is a thermostat which turns the fan on and off to maintain a reasonably level temperature of the coolant. If the fan has stayed on, I would think that the thermostat has jammed on and that's why it keeps the fan running. You will need a new thermostat. ( Not the water thermostat that is in the engine) A fan thermostat is what you will likely need.. A Dealer or parts outlet shop will know what you need.

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My fan speed is stuck on hi no matter were I set it. Also it stays on when you turn it off and it stays on for about 10 seconds after the car is shut off.


I would replace that switch first thing since there is nothing that can make it stay "on" other than itself.

Mar 24, 2015 | Cars & Trucks

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Fan continues run after car off. Runs for about 10-15 miutes.


The "cool down " sensor is malfunctioning , most stay on for only a minute or 2

Apr 02, 2014 | 1997 Acura TL Series

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Radiator fan will not shut off


In some vehicles, the radiator cooling fan is controlled independently by a thermostatic switch. What you perceive as a problem actually is normal operation. When the temperature reaches a certain point, the fan turns on. When you stop and turn off the ignition, the fan continues to run until the temperature decreases to a point where the fan turns off

May 11, 2013 | Pontiac Grand Am Cars & Trucks

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Coolant fan stays on after the engine is turned off, and runs until the battery is dead.


There's a thermostat control switch that lets the fan run after engine shutdown to bring the coolant temp down to an acceptable level. If the fan continues to run, this switch has gone bad. Any major parts store, or a Lincoln dealer, can sell you a replacement switch and show you a diagram that will let you locate and replace the bad one.

Jun 02, 2011 | 1993 Lincoln Continental

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I turn my car off and take the keys out but the fan keeps running?


if the car is warm the fans are designed to continue to run untill temp drops to normal temp and then fans shut off. This is a normal operation of the fan nothing to worry about. Now if they stay running for more than 10 minutes you have a problem.

Feb 03, 2011 | 2003 Mini Cooper

1 Answer

Engine cooling fan run all the time when car is running. had t stat replaced recently. what controls the fan relay?. unplug coolant sensor and fan stays running. need a wiring diag.


Hi, the relay is turned on by the PCM based on data from the coolant temperature sensor. Disconnecting the sensor sends the computer into safe mode so it keeps the fan on. Check the sensor wire continuity to the PCM. If good, try replacing the sensor. Please let me know if you have more questions.
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Dec 31, 2010 | 2002 Mazda Protege

1 Answer

Cooling fan staying on for long periods, running battery flat


There are 2 possible cause for that over working RAD FAN!
  • Check ur temperature switch that might be shorted already or the connector wire have fuse each other that makes the continuity of running the fan.
  • Check the relay, that might have stuck the contactors together and gives power to the FAN!

Check that or u could bring ur car to the nearest garage to assess the situation!

Dec 01, 2010 | 1998 Volvo S70

1 Answer

Flat battery on s type 2001


Hi

Sounds like the battery to me.

Have they done a heavy discharge test on your battery at the garage, and can assure you it is 1OO% ?

The alternator is supposed to keep the battery topped up on charge nicely, even if it is only a few mile run every day, with your head lamps and heater going full blast, and then your fan runs on after switch off.
By the way it should only run for short time, how long have you heard yours run ?
Possibly the thermal switch is staying on too long ?

Did they test your charging rate on your alternator too, at your garage ?

How old is the battery ?

Is it of recommended type ? and not a cheepie from Halfords ?

Hope I have been of some help.

Good Luck

John.



Jan 05, 2009 | 2002 Jaguar X-Type

4 Answers

Does the radiator fan keep running even after switching off the engine


The temperature actuated switch is stuck in the ON position if the cooling fan(s) continue to operate after the engine has cooled down. Locate the defective sensor switch and replace it to eliminate the problem. This could be continuous or intermittent and either way if the switch is faulty it should be replaced.

Jul 21, 2008 | 2004 Honda Civic

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