I just bought a 2003 cls six speed in april and the car's been tight so far. The only problem I have with it is that whenever i turn on my rear window heater the radio gets a fuzzy like I cant get reception. Is this problem common as a result of a bad design or is my problem unique?

 

I don't have the problem.

It's probably related to the fact that the antenna for the stereo is built into the rear windshield.

 

Where do you live that you have needed it between April and now???

And I have no problems when its on, I even have metallic window tints and have no problems.

 

I was just trying out the button one day when i was driving, and it started doing that

 

If you get a grouding kit for your engine that might help with the problem. Some people that got the grounding kits claim it fixed their radio reception.

 

Looking at your avatar, I have a feeling you know a good bit about radio and radio waves.