Review on Conditioning Pressure Switch Sensor 4H0959126B by Patrick Ceo

Well it works. Read to the end. Used on Audi A6 (C7) 2012. Took about 15 minutes to install on 9/4/19. Background; parked car in the garage air conditioning (works perfectly). The next morning, as usual, the air conditioning in the car didn't turn on, which I didn't realize until I was driving down the street. So I pressed the AC button, just warm air. After checking all the fuses (no luck) as the compressor won't turn on. Went on the forums to find a similar problem, most pointed to this pressure switch (in front of the radiator), see photos. I have checked with AC pressure gauges that the system is holding pressure on both sides to ensure there is no refrigerant loss or leakage. You will need a 24mm spanner or Phillips wrench. The crescent wrench worked best to loosen and then unscrew by hand, my 24mm was too long to fit. Most vehicles will require you to restore and then replace the coolant. Not this Audi. It has a schrader valve on the side of the car for a pressure switch. It only allows pressure and refrigerant to pass or check if the valve is screwed tight. I objected to replacing the o-ring after inspection. Don't overtighten! Do not use a 24mm socket! You might be able to use the 24mm oxygen sensor socket from what you have. Retighten with about the same force that was required to loosen. Probably only 150 to 200 ounces of torque. Yes"in ounces". The O-ring is responsible for the actual sealing. AC o-rings are different (if you decide to swap). The process I used is a car with the air conditioning off. Then the machine is switched off. Disconnect and replace the switch. Full autostart. Wait for the engine to idle. Air conditioning is on. It must be cold. Zip everything under the hood and you're done. Call your friends and tell them you saved between $250 and $500. Replace at your own risk. I'm not a professional, just sharing my personal experience.