Ok your probably thinking what the hell is this,,,F30 N20 A/C lines going to the firewall,,,bolting up to the expansion valve. And here is the high side switch and shredder valve,,,,ok hear is where I’m going with this,,,,customer complained about a whistling /beeping sound coming from the center dash area,,,, only happens when fan speed on low and A/C button off,,,,and temp setting at 60′,,,,radio off and car must be sitting outside in the heat,,,,,guess what I heard it,,,,it’s is a beeping noise coming from the center vents. Will look at what the fix is from BMW ,,,yes the high pressure A/C line from the expansion valve to the front condenser,,,,,do you notice something differ on the new A/C line,,,,yes that is a valve to shut off the pressure inside the line,,,it is a electrical valve that we have to splice into the harness to activate it when the A/C system is off. Here the valve built into the line,,,this whole thing doesn’t make any sense and you will see at the end of this blog.so I install this fix it all A/C line as BMW what’s us too. Here the A/C line installed,,,here where that valve sits right under the heater hoses,,,so I charge the A/C system back up and test drive the car just like the customer said,,,,,and guess what the dam noise is still there,,,,son of bitch,,,,lol,,,so now I have to make a puma case and tell them it didn’t fix the problem,,,now they want me to put a A/C compressor in the car for the fix,,,,,well so far so good,,,no noise after putting in the A/C compressor.
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