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

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.

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.

No. i meant the engine fan not coming on, blower works fine.

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.

If the switch is bad will it stop the compressor and therefore the fan from coming on?

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.

Replacing the sensor strangely fixed it you hardly see that on audis. Thanks for the help.

Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.