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I took the fan out from my engine compartment and am now ready to test it. It consists of two fans, one larger than the other connected I believe in series with two large wires, one red, one brown running to the large fan motor and from there to the smaller motor. Also there are two smaller wires one green one black.

I have a small 12V (27A) battery. How do I safely test which component is failing? Don't be afraid to explain like I'm five.

It's on a 2007 Audi A3 2.0 TDI.

Edit: see pics

image 1 image 2 image 3

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Could you post a pic that shows the wiring? –  R.. Jun 4 '13 at 15:54
    
see edit thanks –  user1561108 Jun 5 '13 at 7:47
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With 4 terminals in the connector, I would guess they're not in series but wired separately. It's possible that one of them is for the A/C condenser and the other is for the radiator. But it's hard to be sure. Picking up the Haynes manual for this vehicle might be a good next step. –  R.. Jun 5 '13 at 17:26
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migrated from electronics.stackexchange.com Jun 4 '13 at 16:42

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2 Answers

you could first check if they are getting any current with a multimeter or a tester. Then apply the appropiate voltage directly to the fan and see if it works, most fans work with 12v but if yours are in series it may be different, check the manual.

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The factory electrical manual would be an excellent place to start, if they're still available for your car.

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