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  #1  
Old 02-28-2008, 11:42 AM
dieseldan44's Avatar
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Location: Boston
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Question Replacing under-dash sound deadener?

Pulled my evaporator box and now Im staring at some crumbling 25 year old sound insulation. The main spot where its cracking is under where the evap box sat.

Anyone replace this with anything? I could use dynamat or something like that, but I'm worried about the lack of 'hard top' that the factory stuff has, or messing up the fit of the evap box with thicker material.

All ideas greatly appreciated! Someone surely has gone down this road before :-)


An aside - so glad I pulled the evap box - its not hard. It was full of dirt and stank. Using dmorrison's instructions it took me 9 hours to get the dash off, evap box out, and totally apart on my bench. Im going to replace the evaporator, probably the heater core, expansion valve and clean the snot out of it.

Pic 1: Naked dash area of Tex. Cracked and crumbling insulation can be seen under where the evap box goes.
Pic 2: Evaporator caked full of crud. Theres like 1/2" on there.
Pic 3: All pieces of evap box apart. In the foreground L-R are the evaporator, fresh air section and evaporator bottom. Background L-R is the front with the vacuum switched and the heater core standing up.


thanks,
dd
Attached Thumbnails
Replacing under-dash sound deadener?-acc-001.jpg   Replacing under-dash sound deadener?-acc-002.jpg   Replacing under-dash sound deadener?-acc-003.jpg  
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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  #2  
Old 02-28-2008, 01:40 PM
imagesinthewind's Avatar
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Join Date: Mar 2006
Location: Denver-ish
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Wow.
I'm afraid to attemp a dash removal.
What if I could never get it back in right!!!!!

Let us know when you put it all back together!
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  #3  
Old 02-28-2008, 03:37 PM
Diesel Head
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Check out this thread for info. I replaced all insulation and even added some where it never existed. Very quiet ride now. If you need more info just ask.


Sound Proofing a 126
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  #4  
Old 02-29-2008, 10:31 AM
dieseldan44's Avatar
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thanks diesel head-

im leaning toward just re-doing my firewall with the damplifier pro and going from there. while its apart i will do the top of trans tunnel as well. i bet that is a big noise intrusion area. im hoping the $100 amount of damplifier will be enough. i just want to cover the areas that i cant get to with the dash/evap box.

what started as maybe propping the top ACC vent open has turned into a complete ACC and under dash rebuild i have the time now to do it...so might as well.
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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  #5  
Old 02-29-2008, 11:19 AM
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I would dynamat the crap out of that area "while you're in there" seeing as its a pita to remove the dash
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