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Radiator fan Kicks on and runs for a couple of minutes then cuts off

Tiny
HUMBLE EMACULATE
  • MEMBER
  • 2008 DODGE CHARGER
  • 3.5L
  • V6
  • RWD
  • AUTOMATIC
  • 155,768 MILES
Hey, when I am driving my radiator fan kicks on and runs for a couple of minutes then cuts off. My temperature gauge is in the middle but sometimes it goes to hot then goes right back to normal temperature. Would you know what the problem might be? My car just started doing this.
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Saturday, December 31st, 2016 AT 2:46 AM

12 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
This is a rather complicated two speed fan system. I am not sure what you could possibly know about how the fan is operating while you are driving. There are a number of different situations that trigger fan operation at differing speeds. About the only reason a fan would kick on in a moving vehicle would be due to AC or defroster operation that engaged the AC compressor. There is a possibility you could be missing the low speed but you would need a bidirectional scan tool to test any of that.

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Saturday, December 31st, 2016 AT 6:39 AM
Tiny
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Sorry, I gave you the wrong wiring diagram. Here is the correct one.
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Saturday, December 31st, 2016 AT 6:46 AM
Tiny
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I am not talking about my AC fan I am talking about the radiator fan. I run the AC or heater at the same time and hear two different fans at the same time.
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Saturday, December 31st, 2016 AT 9:30 AM
Tiny
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They are one in the same. The radiator fans operate for AC purposes.
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Saturday, December 31st, 2016 AT 9:33 AM
Tiny
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I know yesterday I did not really run the AC or heater and the cooling fans kept coming on. Is it because my engine is running too hot?
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Saturday, December 31st, 2016 AT 9:35 AM
Tiny
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No, that is what they were put there to do. The only question there could be is if both high and low speeds are working and you will likely need a scan tool to find out. I have not read anything here that would make me suspect there is anything wrong.
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Saturday, December 31st, 2016 AT 10:08 AM
Tiny
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Well, yes my high speed is working when I turn heater or AC on full speed.
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Saturday, December 31st, 2016 AT 10:26 AM
Tiny
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  • MECHANIC
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The fans are controlled by the PCM using the same temperature monitor used for mixture control. There are no sensors dedicated to cooling fans.
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Sunday, January 1st, 2017 AT 4:33 AM
Tiny
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I found the problem there was not any coolant in my reservoir, but I have a leak I just do not know where.
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Sunday, January 1st, 2017 AT 8:57 AM
Tiny
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That probably should have been one of the first things checked, but now you need to do a pressure test to locate the source of the leak.
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Sunday, January 1st, 2017 AT 9:02 AM
Tiny
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Thanks it was my water pump
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Wednesday, January 4th, 2017 AT 3:25 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Glad you could get it fixed please use 2CarPros. Com anytime we are here to help

Best, Ken
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Monday, January 9th, 2017 AT 11:54 AM

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