I've owned the man van ('12 GC SXT) for about 3 months now and have come to the conclusion that the interior is about as soundproof as a tin roof in the rain. I have unlimited access to dynamat style sound deadener at work, but was wondering if anyone has used an expanding foam in the A and B pillars to cut some of the noise? I've read that "Great Stuff" will work, and have also read that the "Great Stuff" isn't...great....stuff.....

Anyway, anyone have any experience with this?

 

i can't contribute anything to this, but i was just telling my wife that the van was a lot noisier than our old yukon when we took it on a road trip.

 

I've used expanding foam to keep the elements out of a rusty caravan I kept to get myself a new degree. It held fast even though directly exposed in some areas (yeah, it was that rusted out) and yes I believe it helped reduce cabin noise remarkably. You might want to make sure you don't gum up the works, though. It wouldn't be fun to dig through it to find a wire and would easily clog up window function.

I used it in the rear wheel wells.

 

I also have a 2012 GC SXT which has rattles galore I have been chasing. I cant add to your question about using expanding foam but I was considering pulling off the panels and using dynamat type sound deadener. I know from experience using that product though, that it is very expensive. Do you have any advice for me as to where to obtain a similar product which is cheaper than dynamat. Also can you explain to me where the "A" and "B" pillars are located you referred to.

 

We use a knock off at work that works just as well called "Road Kill" by Stinger. It's still pricey but not near as much as dynamat is. The a pillars are the posts between the windshield and the front doors, and the "B" pillars are the posts between the front and rear doors