BMW E36 Blog

Electric Fan Problems On My BMW E36

20th April 2008

Electric Fan Problems On My BMW E36

posted in Cooling System, Technical Info, Tips & Tricks, Uncategorized |


post rating
PoorOkayGoodGreatExcellent (No Ratings Yet)
Loading...

 

I’m having 3 problems with the electric fan in my car.

First, I know that the electric fan should have 2 speeds: Low and High. My electric fan does work on the high speed only, I guess that I’m having a problem here. I also noticed yesterday that the temperature gauge moved a little bit towards the one clock instead of the normal 12 clock position when I left the engine running (with the A/C on) and went to grab something. The second problem that I have with the fan is that whenever the fan kicks in, the RPM bounces for like 20 seconds or a little bit more, then it returns to normal.

The third problem happens usually after I reach home and turn my engine off, the electric fan kicks in and keeps working for like 30 or maybe 40 seconds before it stops.

I noticed these problems before (except for the temp. gauge one) but I didn’t pay much attention to it until yesterday when I popped up the hood and decided to trace how the electric fan is supposed to work. The task is simple; there’s a coolant sensor that is placed in the returning hose to the car’s radiator. This sensor is supposed to keep watching the temperature of the coolant and to send a signal whenever the coolant temperature exceeds a certain value (176F, 80 C according to Bentley Manual).

To my surprise, I found that the electric fan power source is not connected to any special part that is connected to the ECM as I previously thought!! Instead, it’s connected to a relay that can connect/disconnect the fan with the battery directly LOL! I celebrex without prescription, purchase clomid. have to say that the electrician who used to work on my babe is a stupid one :D . The relay of course is controlled by the coolant sensor and whenever the coolant reaches a specific temperature, it will simply give the relay a signal and thus closes the electric fan circuit with the battery which drops the power from the battery because as we all know, the fan consumes a lot of power and thus the RPM starts bouncing because the ECM is trying to compensate for the loss.

So, I’m trying now to figure out how to re-connect my electric fan correctly to the auxiliary fan relay (which I found in the BMW E36 fuse box layout).

Anyone of you guys can help with this? I need to know what are the colors of the wires that are connected to the electric fan and to the coolant temperature sensor. Some pictures may be good too ;-)

 

BMW E36 Blog: The ultimate BMW E36 M3 information source.

 

Join the BMW E36 Forum

BMW E36 Forum
 

Want to receive exciting tips & information about BMW E36 cars? Enter your Email:-


 

 

Having A Problem With Your Bimmer?

Use JustAnswer Service to get help from a BMW expert now! You can also read my review of this service here.

There are currently 5 responses to “Electric Fan Problems On My BMW E36”

Why not let us know what you think by adding your own comment! Your opinion is as valid as anyone elses, so come on... let us know what you think.

  1. 1 On April 20th, 2008, Dennis said:

    LOL!

    Think my reley and sensor might be broken then, i have never ever heard my electric fan running,. Not even if i have been driving at 180 km/h for 5 hours, in 20 degree C sunshine…

    Think there is something broken, or does is my coolant just below 80 degrees all the time?

    Dennis

  2. 2 On April 21st, 2008, Tony Sticks said:

    Dennis, does your temperature gauge move beyond the 12 clock?

  3. 3 On April 21st, 2008, Dennis said:

    Hi Tony,

    No is does not move beyond 12 clock, sometimes when driving at high speeds (190- km/h) it stays between 12 and 13 clock. But it drops quickly to 12 clock again. I just think it’s weird i have never heard the electrical fan turn on, or is it just me being paranoid?

    Dennis

  4. 4 On April 22nd, 2008, Tony Sticks said:

    I’m not really sure. My car fan seems to be messed up, so I can’t judge about that. I suggest you take a look at your fan and how it’s connected. As long as your car’s temp doesn’t go up, I don’t think you have any problems.

  5. 5 On July 12th, 2008, sam said:

    just replaced my radiator in my 95 318i and now my temp stays at 12 for a while and then temp starts to rise slowly.even when i drive it begins to go past 12 after a while.my electric fan also doesn’t come on at all even before i changed radiator the fan never came on and my temp gauge alway’s stayed at 12.could my problem be a fan relay,thermostat,water pump or more serious problem?

Leave a Reply