I do not know if someone can help.

The A/C compressor does not start (or click on) despite the gas pressure is fine.

I changed the big relay located under the battery, I checked the sensor pressure which seems to be fine, i checked the relay 53 under the dash board driver side.

Every component seems to be fine but i have not power on the compressor ??

Any idea welcome

 

On the center console of your A3, there should be a couple of ***** with the temperature control. Right there should also be a screen displaying the temperature and fan speed. One of the buttons next to the display says "ECON". That button, when on, turns on economy mode, which disables the compressor in the A/C so as to prevent unnecessary power loss in the engine. To turn the compressor on, turn off economy mode. Unfortunately, with the compressor on, you will experience a slight loss of performance with the engine, but so long as you aren't drag racing, I think you'll be okay! I hope this solves your problem!

Bon chance!

 

sjcarton's advice may be simple, but I once spent half an hour diagnosing a fuel problem before I reliazed I was out of gas. My only defense was the car didn't have a gas gauge.