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Cooling fan blowing too loud?

Tiny
JBUDNEAL13
  • MEMBER
  • 2007 BMW 328
  • 2WD
  • AUTOMATIC
  • 257,000 MILES
I bought this car, I the wiring is all messed up, I will eventually post another question concerning that... But anyway my fan is roaring, and I look by a coolant hose and notice a missing plug, I find the plug in the air filter box, I have. I clue where the wires go, while other wires are out of place.
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Sunday, November 20th, 2022 AT 3:36 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

That is the coolant temperature sensor in pic 2. What colors are the wires in the harness you found?

The radiator outlet coolant temperature sensor is used by the DME to operate the cooling fans. The wiring should go to the DME. What colors are the wires in the harness/connector you have? See if they match the ones in the pic below.

Let me know.

Joe

See pic below.
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Sunday, November 20th, 2022 AT 9:53 PM
Tiny
JBUDNEAL13
  • MEMBER
  • 7 POSTS
They are black and yellow, the wires on this car are not good. When I connect the piece in, I don’t see anywhere to connect the wires, they possibly are gone or out of place (I found the connector in the air filter). I need a wiring diagram for the whole car honestly, I can show you what I am talking about in the morning.
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Sunday, November 20th, 2022 AT 10:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If you go to the DME, is there anything cut? Also, I would be happy to provide the schematics I have, but I need to narrow things down. Otherwise, I will be attaching pics for a week. LOL

Tell me if there is a specific circuit you want to focus on. For example, do you need the powertrain management schematics or the transmission, ABS, and so on?

Let me know.

Take care,

Joe
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Monday, November 21st, 2022 AT 6:26 PM
Tiny
JBUDNEAL13
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  • 7 POSTS
I can give you a run down from what I’ve seen so far, I will definitely need to visually see it because I’m novice. But I will need to see headlight schematics, that connector for the outlet sensor, and also o2 electrical connections.
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Tuesday, November 22nd, 2022 AT 10:15 AM
Tiny
JBUDNEAL13
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  • 7 POSTS
I honestly couldn’t tell you if anything looks cut or not, there are a bunch of wires there, you want me to take it out and show you?
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Tuesday, November 22nd, 2022 AT 10:25 AM
Tiny
JBUDNEAL13
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  • 7 POSTS
This is my dme and the others are the loose wires I’m thinking some terminals are missing.
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Tuesday, November 22nd, 2022 AT 11:59 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Pic 2 is the tire pressure monitor module. I'm not sure what I'm looking at in pic 3. I can only see a harness.

As far as the schematics, pics 1 and 2 are the headlamp schematics for the non-xenon lamps. Pics 3 and 4 are with the xenon system. Pics 5 and 6 are the adaptive front headlamp circuit.

Pics 7 and 8 are for the oxygen sensors. I highlighted all wiring related to the 4 different O2 sensors.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

I hope this helps. Let me know if you have questions.

Take care,

Joe

See pics below. Note: I cut each schematic in half to make them readable for you. In order, every 2 pics is equal to the one page I got the schematics from.
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Tuesday, November 22nd, 2022 AT 6:40 PM
Tiny
JBUDNEAL13
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  • 7 POSTS
Thank you, one last question. If I have a wire and it just won’t reach, what will I need to do?
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Wednesday, November 23rd, 2022 AT 8:20 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If you have a wire that won't reach, you will need to add to it. When I do this, first I make sure to get wiring of the same size or gauge. Then, I remove approximately 1/2" of insulation on each wire and slide shrink wrap over the wires. I then solder the two wires together, making sure they are tight and have a solid connection. Once that is done, slide the shrink wrap over the repair and heat it with a heat gun.

Based on its location and function, often times I will wrap electrical tape around the shrink wrap as well to provide more insulation to the repair.

Let me know if that helps or if you have other questions.

Take care and Happy Thanksgiving.

Joe
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Wednesday, November 23rd, 2022 AT 7:54 PM

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