Got to work this morning after running the defroster on high, turned the key off and the speakers popped, like a static discharge or a high-power amp powering up. I turned the key back on and off several times and it still happened. Started it up to come home and everything was normal. Got home after running the defroster on high all the way and the problem happened again.

After the truck cab cooled off the problem went away again???? It almost seems like the radio was getting too hot. I did a search and only one thread had the word speaker.

2008 f150 4x4 4.6 am/fm single cd factory radio

 

My 07 does the same thing. Sometimes it will do it everytime I shut the truck off and other times it can be months in between it doing it.


Being in the desert I only use the defrost a few times a year so I dont think its related.

Do you happen to have the factory Ford power code alarm with remote start?

I have the factory radio with the 6 disk changer MP3 aux input stock speakers.

 

Post over here Audio & Video Systems, Navigation, Satellite Radio & Mobile Electronics - Ford Truck Enthusiasts Forums for a better chance of an answer.

 

09-20-10*** SPEAKER POP AND/OR RADIO INOPERATIVE/BLANK/LOCKED UP

This TSB should help. It's the radio and the use of the heater on high settings.