Question about Mercedes-Benz E-Class

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I have a mercedes e class with knocking sound on air conditioning

I have a knocking sound coming from rhs of engine bay whilst the aircon is turned on.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 79 Answers

SOURCE: Knocking on front suspension Mercedes 200 C Class

probably the shock absorber

Posted on Apr 08, 2009

redbeard00
  • 957 Answers

SOURCE: air conditioning

If the system isn't cycling on and off every two seconds then the charge is fine, your evaporator may be clogged. It might be more cost efective to send it to the dealer.

Posted on Apr 26, 2009

SOURCE: Air Conditioning on 2001 Mercedes-Benz CLK

You could remove fuse 25 (30amp) in the underhood fuse panel, but then no blower for AC, heat, or defrost. Need to replace blower regulator.

Posted on May 20, 2009

  • 1619 Answers

SOURCE: I can't figure out the dials for my air conditioning

its automatic. Probably need a charge or have a bad sensor somewhere.

Posted on Jun 15, 2009

  • 811 Answers

SOURCE: 1996 bmw 323i m52b25 slight knocking noise from engine between

take rubber hose and place near ear use as stethoscope, pin point noise, and pull apart, till problem is located. buy manual

Posted on Sep 12, 2009

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1 Answer

Air condition in 1999 Mercedes E320 will not get cold, what could it be and about how much will it cost to repair? Will I have to take it to a Mercedes dealer for repair?


first take it to an aircon recharge garage(cheaper)the if that doesnt improve things and you are hands on get back to us....

Apr 05, 2010 | 1999 Mercedes-Benz E-Class

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E180auto passengerside aircon always blowing cold 1992 model


Sounds like the vent control motor is bad. It controls how much hot water flows through the heater core. OR the heater core for that side is clogged

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Air conditioning causes car to idle or die.


Depending on whether your car is Injected or Carby induction, The aircon system has an IDLE UP circuit which is supposed to raise the Idle while the Aircon Compressor is engaged. The Compressor cycles on & off to charge the system pressure as required. The Idle up system typically uses an IDLE UP SOLENOID which is usually mounted directly on the throttle linkage at the Carby or Throttle body itself, or a Vacuum Solenoid which switches vacuum to a Diaphram which is connected to a linkage on the Carby or Throttle body itself, or a Vacuum Switch which ports air into the throttle body to raise idle (This type on injected vehicles only). It sounds as if the IDLE UP system has failed or is not adjusted properly. Revving the engine spins the compressor faster thus charging the system sufficiently to dis-engage the compressor, which in turn removes the load from the engine, allowing it to idle again. A simple way to test is to disconnect the Aircon clutch wire (make sure it cannot fall into belt) & switch on the Air with the engine running. The RPM should raise typically around 300 RPM. If it doesn't the IDLE UP is not working. Hope this helps.

Dec 07, 2009 | Nissan Pulsar Cars & Trucks

2 Answers

Engine keep turning off


It could be a part called the Idle control Valve. It regulates the Idle speed and keeps it smooth. If it is choked up with carbon gum or the little motor inside it is faulty then it will not allow enough air too pass for smooth idle. When you put your air con on the engine is under more load because it has too turn the aircon pump so it will stall. Also you have a little device on aircon cars that raise the idle a little to compensate for the extra aircon load. If this is not working it could be that.

Jul 06, 2009 | 1996 Mercedes-Benz C-Class

3 Answers

Air conditioning blows warm in hot temperatures


HAS THE COMPRESSOR CLUTCH CONTROL MODULE BEEN REPLACED? ANOTHER PROBLEM IS THE CLOSING COIL OF THE ELECTROMAGNETIC CLUTCH GOES OPEN IN HOT WEATHER, HAS THAT BEEN REPLACED.

Jun 25, 2009 | 1995 Mercedes-Benz E-Class

1 Answer

Air Conditioning on 2001 Mercedes-Benz CLK


You could remove fuse 25 (30amp) in the underhood fuse panel, but then no blower for AC, heat, or defrost. Need to replace blower regulator.

May 18, 2009 | 2001 Mercedes-Benz CLK-Class

1 Answer

Blower motor not coming on


hello,check your fuse box for busted fuse,or you can remove the plastic cover in rear end in engine room,air filter and aircon motor can check for free movement,as well the blower regulator on top of blower,ty

May 05, 2009 | 1994 Mercedes-Benz S-Class

1 Answer

Air conditioning whistles


maybe the sound that you hear come from;a aircon flap not fit properly,freon flow from hose or tube you may buy a insulator tape,you may rap or cover the tube.

Feb 18, 2009 | 1997 Mercedes-Benz C-Class

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