507AMGEE

Hi I’m having a little problem with my 2015 507 with 30k miles seeing if anyone here had this problem and know of a fix before I bring it to the stealership.

So this morning started the car The AC worked fine and was blowing cold air. Drive around to run some errands then stopped to get gas and started the car back up and boom AC blowing outside air and my radiator fan stays on from startup to shut off now. Only good part is coolant and oil temps dropped a lot with the fan stuck on but NO AC in 90 degree weather!

thanks in advance

Charlie Simmons

It's no big deal. Someone suggested it might be the computer system of the air vent system is messed up after Eg. Change of battery or system being disconnected. That makes sense. So I reset the system to bring it back to factory setting.

First of all, you turn the key to position 1, that is not fully turn on the car. Press the control over the Multifunction steering wheel on the left until it shows on the display: settings: To reset, press Reset button for 3 seconds. Note: reset button is on the left hand side of the display, a small black knob. Then it show on the display- Return to factory settings.

Then you turn the key to start the car. Cool air blow out! Bingo! I hope it works on your car as well!

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507AMGEE

Thanks Charlie but I don’t think that is for the w204

CanadianC63

I had this same problem and it was the low pressure switch.

Is the larger of the a/c lines under the hood getting cold? If not, your compressor may not be turning on due to the faulty switch.

507AMGEE

thank you so much! I’ll mention for the dealer to check my switch out tomorrow before they suspect I have a bad compressor or something. Dealers love just throwing parts at your car.