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If it makes a clicking sound that means that the radio is catching static. OR If the noise comes from the area around the glove box, then you are hearing the climate control switchover valves trying to set the system to the ideal temperature, but it is having problems doing so because of a problem with the system. The problem can be anywhere in the system, but most likely a vacuum leak due to a leaky vacuum element. Or the feedback potentiometer is dirty, and is not providing a clear signal to the unit. Or the control unit itself is faulty, possibly due to a cracked circuit board due to years of driving. I have a web page set up to troubleshoot the complete 190 201 climate control system: http://cacavas.com/mb/TTM.html Good luck, John Cacavas Los Angeles jcacavas@gmail.com

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Q: Why do you hear a clicking sound when you switch the radio on in a Mercedes 190e?
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