our 2006 clk 500 had a low battery. charged and started. then a sound like a drone (buzzing ) started occasional . stops after car sits. what is the cause

Asked by Apr 28, 2015 at 01:04 PM about the 2006 Mercedes-Benz CLK-Class CLK 500 Convertible

Question type: Maintenance & Repair

loud buzzing after car has run and turned off.  never happened before the low battery.  could it be the car reprograming the computer, the alternator or something else.  doesn't do it everytime

2 Answers

11,805

This is a guess, but It may be a cooling fan(s) that is still running after the car is shut off. Depending on the temperature of the engine, they may continue to run after the ignition is off to cool the engine and compartment.

15,345

Do you know the reason for the low battery? If you disconnected the battery, you may have to reprogram the battery, but I think only new batteries need to be re-programed. The alternator will only operate whe the engine is running as it is connected to a belt driven by the running motor. It stops turning after the engine is turned off. Like Mark above stated, the fan from the radiator may still be running. Lift the hood and look, and listen. If the battery goes down again, have the battery tested for a possible bad cell. Do you have air shocks? It may be adjusting the car to a level position after you stop or charging the system. Some cars have that suspension system and the air compressor will charge the tank up even if the car is turned off.

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