Clicking Noise from radio

I have a 1997 Lincoln Town Car Executive Edition. Currently I noticed that a clicking noise, simlilar to when the hazard lights are on, is coming from the center of the dashboard, sounds like behind the radio. This noise seems to come and go with out any rhyme or reason. Can someone shed some ight on this. Thank You
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The random POP may be due to having your BASS control at maximum setting.
Check this link.
http://www.markviii.org/LOD2/blend_door_repair.htm
It makes you wonder why Ford could not have done a better design job with this part, doesn't it?