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The rear screen heater is a pure resistance being fed with direct current and normally will cause no radio interference as it does not vibrate or oscillate, though a loose or dirty connection or dirty switch could produce interference.
Some cars use the rear screen as a radio aerial and these are prone to producing radio interference, especially when trying to receive vertically polarised signals.
I tried this myself using a bi-fi rear screen aerial adaptor and was very disappointed with the results, the signal-to-noise ratio was appalling.
If your car uses the rear screen as an aerial there is likely to be a box of electrickery physically somewhere near the rear screen where the aerial cable originates. This box contains stuff to decouple the radio signals from the HRW circuit and will probably contain a signal amplifier.
The static you hear might just be a drastic reduction in signal strength rather than actual generated interference. You can do little else but to check the connections to and from the unit particularly the ground connections and check the voltages present on the related wiring. If no external faults are found it is likely the box of electrickery has failed.
Spending a while looking at dedicated forums might help further.
by noisy do you mean static, squeal on starting the car or what
if it is static it could be a bad aerial
squeal could be electrical interference from starter motor
dealers do not fix radios so you would be better off taking it to a radio shop ( where radios are installed ) for a qualified opinion and diagnosis
if you take it to several and you get the same opinion then get a quote to fix or replace
I recommend you get a 9v battery (like the one in a kids walkie talkie) rig it so you can connect it to the battery leads. this will keep the programming in the radio and computers alive momitarily while you remove the battery hold down and terminals.
This problem will only deal with the antenna cable correctly connected behind the unit and up to the exterior roof antenna. Any break in the harness may cause this effect. In early VW's when the antenna was located on the front left fender, owners were complaining of poor reception and static interference from the ignition coil near by. Besides hearing your AM station you also hear electrical noise which changes pitch as you increase the engine speed while keeping FM unaffected. The solution was insulation and relocating the antenna at the farthest part of the vehicle, rear roof. Make sure you have the the right connector for your unit to make a perfect connection.
A static on AM is just interference. Similar to operating a mixer when you are watching TV. You would remember the grains in the TV but no audio disturbance because, video is AM transmitted and audio FM transmitted. A static on AM radio could be due to many factors in the car. The ac system, the music system itself or the engine rpm. The solution does not lie in finding out which is creating the noise, it lies in insulation. Check the antenna and change it if needed. That should fix it.
The filter in the radio has gone bad or the antenna connection shield is not grounded properly. Electromagnetic interference is the problem. Difficult to run down. Try another radio to determine if it's simply the internal filter in the radio/audio head. If a different radio eliminates this noise, the problem is in the radio's filter. If the problem is still there, is't most likely in the antenna circuit.