TRC

This has happened on 2 occasions with my 15' 3500, both times after I had all the doors open for an extended period of time. I had vacuumed an detailed the interior, when finished I hopped in and started the truck to move it away from the garage and the radio was at full volume. I assumed I turned it up when cleaning the dash/radio but as fast as I could turn the knob the the radio volume and volume indicator would climb back to full, turn the key remove and open the door and it turned off. Key back in and on and it was back to normal. After that I was very careful detailing the truck around the radio, and it didn't have the issue for maybe a year, and a few cleanings. Most recently it happened again after interior detailing, this time I couldn't get it to turn off, key out of the ignition drivers door open. I tried Mute, volume on the steering wheel volume knob and changing the radio station. It would not stay below full volume, it lasted long enough that I played with every button and turned the key on and off started the eng. stopped the eng. and finally went to get tools to disconnect the battery and it stopped when I was walking away, key out and drivers door open. I was terrified driving it for a long time, wondering when or where id be when the radio would come on full bore. Its been about 6 months without issues. I really hope m3n00b's dealer is onto something.

I just went checked how the flow actually feels out the defrost vents, it feels pretty even across the the openings and it does seem to be a decent flow. The fan and air sure make it sound like its moving a lot, and the cabin does heat up and get hot with just defrost vents on. As soon as I get a a little bit of free time Ill take it to another dealer and see what they have to say on the issue, maybe talk to a service manager to see if its ever been a compliant before, Thanks for the suggestion!

Do you find it necessary to keep the defrost on a relatively high setting? I hate to be a pain it the a** but maybe ill try to take it to another dealer and see if there's any suggestions or upgrades that could be done, because its apparently not a known issue. Ive worked in a dealership before, it might be more useful to contact GM regarding this potential safety hazard, seem that the manufactures are more worried about safety than independent dealers are. If i wanted to have icy wipers and a streaky frozen windshield id daily drive a s***box not a $45k truck. Thanks for the reply, if anything comes of this ill be sure to update.

Hey guys sorry to drag this antique out from its resting place, its all I have found in internet searches that describes my issue. I'll start with I have a 2015 GMC 3500HD with the 6.0 gas engine and driving in the Northeast winters is now more inconvenient and dangerous then it was with my past trucks. The massive "ditch" between the windshield and end of the hood, deep in that ditch is where the wipers hide, far below the defrost vents on the dash. The issue is that the water and slush running off the warm glass along with drifting snow off the hood gets trapped in here and freezes solid with the defrost any less then maxed out (Cant hear anything in the cab and its way to hot like this) This happens fast enough that when driving in snow or freezing rain the wipers freeze solid in the "ditch" in as little time as turning the wipers off for a couple minutes (or turning down the defrost) or parking to get gas, or run into the store. its a major event to clear the frozen mass from the wiper arms and blades. For those of you who say every truck does this ill say, no, they don't I have a 2004/5 2500HD and prior to that a 2005 F150. My company vehicle Is a 2012 GM3500, also in that fleet is a 2002 Chevy 2500, 2008 GMC 2500, and a 2011 GMC none of these have ever had this issue to anywhere near this extent. I've tried different wiper blades different brand of washer fluid/deicer Am I the only guy who has ever had to drive in the s***y weather with a 2015-2019 HD truck and had this issue?!? Sorry for the lengthy ramble, just wanted to explain the issue as clearly as my simple little brain will allow,