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2007 Audi A4 FWD 2.0L turbo (BWT engine code). This vehicle…

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Hello, 2007 Audi A4 FWD 2.0L...
Hello,
2007 Audi A4 FWD 2.0L turbo (BWT engine code). This vehicle is having an issue with the cooling system where the fans won't engage. To make sure that the fans motors are working I've pulled the temperature sensor plug. Both fans are working but I've noticed that the bigger fan (A/C compressor side) has more speed than the smaller fan which doesn't seem to reach full speed.
On an different test, once I turn on the A/C, it take several minutes to see only the bigger fan trying to engage but never continuously full speed. By reading the signal voltage (red and white wire) on the big connector for the fans, it never reach 12 volts. It keeps oscillating between 0 to 9 volts.
Could you give me another direction to ping point this problem? Or is there a common problem that you know?
Thank you.
Submitted: 8 months ago.Category: Audi
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Answered in 12 hours by:
11/22/2017
Audi Mechanic: Wolfgang, Audi master tech replied 7 months ago
Wolfgang
Wolfgang, Audi master tech
Category: Audi
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Experience: Senior Audi Master Tech 15 yrs
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Thanks for choosing Just Answer . I'm Wolfgang here to help!!

I am confident we can resolve your problem together. Please
understand that I don't know your skill level. In most cases when you have a problem
with the way the vehicle performs, specialized tooling is required to acquire computer
data/information or engine testing results. We didn’t build these complicated vehicles; we
just diagnose and fix them. Also understand that I can't see, smell, hear, or touch the
vehicle either, so it may take a few replies to get to satisfactory results. Note there may be an issue where the complexity of the issue will require a Premium Service. This service will be an addition to the normal question cost. Usually it does not come down to this but keep in mind!! I am also going to direct you with the fastest, easiest and most common things to check first. Please be
patient and permit me to do what I do best.
I also try to give all of the information you may need, expecting a “positive rating” in
return. I will also continue assisting you after you have rated me, if necessary. If there
is any reason I cannot get a positive rating, please let me know why “in advance”, so I
can go another direction for you. I am sorry you’re having this problem; I’ll help you
through it.
Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail.

Did you perform a scan test of the engine ecu to see if any codes are stored?

thanks

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