Anyone know why my fans turn back on after I turn off the car?
Hey guys my 06 Mini Cooper S fans have been turning back on right after I turn it off for about 5-10 minuets. Is there something going out ? Maybe radiator, fans or possibly even low coolant?
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Your resistor for your low speed fan is probably shot, thus why your high speed fan is turning on after the car is off in order to cool it down.
Reference the later pages in this thread for the fix. Its relatively simple and <$10. https://www.northamericanmotoring.co...-solution.html |
Could be stuck relay as well.
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Originally Posted by pmanliu
(Post 4342543)
Your resistor for your low speed fan is probably shot, thus why your high speed fan is turning on after the car is off in order to cool it down.
Reference the later pages in this thread for the fix. Its relatively simple and <$10. https://www.northamericanmotoring.co...-solution.html |
Originally Posted by r53coop
(Post 4342565)
Could be stuck relay as well.
As far as diagnosing potential radiator fan resistor issues, here's a good quote from back in the day (bottom section explains how to enable actual coolant temp inside your speedo!)
Originally Posted by cooperSml
(Post 3692923)
1) Turn off the car if your fan is still running disconnect the battery.
2) Open the fan connector (on my case Cooper 2006 S) it is only one connector for fan 1st stage and second. 3) Reconnect the battery, the fan should not be running 4) Now with a voltimeter measure on the fan connector (side that connects to fuse box) if on either 1st and 2nd stage pins you have 12 volts 5) If so the relays must be operated. To confirm remove the relay fan 1st and 2nd stage. 6) Now on the fan connector you should NOT have voltage. 7) If there is voltage you must have a short in the cable. Note: The Control Module activates the FAN based on temperature readinds of the car. If CM is operating the FAN even with the car not running it is possible because there is situation where the car is leaking coolant when you stop the cast iron block is still heating up and the CM keeps the FAN running until the temperature drops. In your case (if no short circuit somewhere) my guess is that in some how the CM is thinking the temperature is above the threshold and keeps the FAN running regardless. ====================================== Regarding the weird behavior with low voltage. A health battery when you start the car goes to a 9-10V due the load imposed by the start motor. If a battery is not healthy and has a weak charge it can fluctuate more, on this case causing oscilation in voltage and the effect can put electronics in the threshold almost cutting off where you can observe weird behavior. I had a drain of current (almost a short circuit ) in the clutch of my AC a while back, everytime I was turn the AC on lights on the dashboard were coming with no reason. ======================================== Do you know how to use the On Board diagnosis on your Mini? You could use that to see how the CM is seeing the coolant temperature in your MINI. When you enter the test MODE you can check stuff like this, but you are going to be insterested on TEST 9.0 and TEST 7.0 1.0 Chassis number 1.1 Kilometer count 1.2 Parts number 1.3 Coding-, Diagnostic- and Bus-index 1.4 Production Date (Calender week/year) 1.5 Hard- and Software status 1.6 Injectorstatus, Cylinder count, Engine factor. 2.0 Combisystem Test 3.0 Service intervall counter 4.0 Actual fuel consumption in l/100km. eg.0154 = 15,4 liters/100kms. 4.1 Consumption in liters/100kms. 5.0 Distance consumption in l/100kms. 5.1 Actual rest distance with available fuel in Kms. 6.0 Actual amount of fuel in tank. eg. 123321 =12,3liters left 32,1 liters right 6.1 Total amount of fuel in tank. 6.2 Show value of Fuel guage. 1= both senders OK, 2= sender failure, 3=ti signal unplausible (no reading) 7.0 Actual coolant temp. 7.1 Actual outside temp. 7.2 Actual engine revs. 7.3 Actual speed 8.0 Hexadecimal readings of menu 7.0 to 7.3 9.0 Actual on board voltage (Battery) 10.0 Land codes 11.0 Unit codes 12.0 No funktion 13.0 Gong test 14.0 - 14.4 On board diagnostic codes. eg 000000 = no failures 15.0 - 18.0 No funktion 19.0 On/Off for Test menu. 20.0 Correction factor for Fuel consumption Formula for correction: Shown consumption x 1000 / user defined consumption Push the trip reset button to begin the correction. Numbers count up from 0-9, when correct number shows push trip reset button. 20.1 Sets 10ths. for consumption factor 20.2 Sets 100ths. and 1000ths. for consumption factor 20.3 Saves the new consumption factor and shows new value 21.0 Software reset. (Same as disconnecting battery) |
This is completely normal behaviour if the engine temp is high when you turn off the car. Does nobody read their manual?
Could be not cooling properly or it could've been a hot day. |
Originally Posted by Mini-Moi
(Post 4342899)
This is completely normal behaviour if the engine temp is high when you turn off the car. Does nobody read their manual?
Could be not cooling properly or it could've been a hot day. Please advise of the page number, I like to keep records of certain problems/issues. |
Hot days and track days it will kick on. On cold days with non track times its a sticky relay or low coolant.
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It can also be a symptom of low coolant. Once it cools down, check your level and your overflow tank for leaks. It was happening on my buddy's car and his tank was leaking. Replaced the tank and topped up the coolant, and the fan issue went away.
The plastic overflow tanks are relatively inexpensive and not hard to replace. If I were doing it over, I would have sprung for an aluminum one rather than replacing the plastic with plastic. I know it will fail again eventually, and NEXT time I'm paying for the more durable part! Duane |
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