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Radiator fan not coming on when the A/C turned on?

Tiny
BHAMDOC1973
  • MEMBER
  • 2010 AUDI A5
  • 3.2L
  • V6
  • 4WD
  • AUTOMATIC
  • 92,000 MILES
HVAC unit works fine. Fan not coming on when ac turned on. A/C compressor turning. These are the codes I found.
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Tuesday, September 17th, 2024 AT 11:49 AM

8 Replies

Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
I think its the pressure switch. I removed the front plastic cover and found it but everywhere online it looks different. Can you get me part number? Here is mine and what I found online.
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Tuesday, September 17th, 2024 AT 2:48 PM
Tiny
KEN L
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  • 47,526 POSTS
I don't think the pressure switch will make the blower motor stop working. Here is a guide to help test to see if the blower motor is bad:

https://www.2carpros.com/articles/how-to-test-an-automotive-hvac-system-blower-fan-motor-a-detailed

I would check the blower motor wiring connections and the wiring at the speed resistor which I have seen burn up the wiring at the connectors. Here is the location for both.

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Check out the images (below). Please let us know what happens.
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Tuesday, September 17th, 2024 AT 4:12 PM
Tiny
BHAMDOC1973
  • MEMBER
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No. I meant the engine fan not coming on, blower works fine.
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Tuesday, September 17th, 2024 AT 4:14 PM
Tiny
KEN L
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Okay, here are the radiator fan wiring diagrams so you can see how the system works. That pressure switch looks like a high-pressure switch, I don't have the part number for it.
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Wednesday, September 18th, 2024 AT 8:34 AM
Tiny
BHAMDOC1973
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If the switch is bad will it stop the compressor and therefore the fan from coming on?
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Wednesday, September 18th, 2024 AT 8:35 AM
Tiny
KEN L
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Does the system have refrigerant in it? This will cause the problem you are having. Try unplugging the pressure switch and then jump it to see if anything changes.
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Wednesday, September 18th, 2024 AT 5:33 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Replacing the sensor strangely fixed it you hardly see that on audis. Thanks for the help.
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Saturday, September 21st, 2024 AT 3:39 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Sunday, September 22nd, 2024 AT 10:06 AM

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