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Insulation in blower duct- is it necessary?

dwg on Sun June 21, 2009 6:24 PM User is offline

Year: 1967
Make: chevy
Model: Impala

When I removed the Blower air intake snorkle from the passenger's side kickwell, I noticed that it was lined with a heavy felt insulation.

The whole thing was rusty and deteriorating, so I have cleaned it all up, fixed the rust holes and repainted it. It looks like brand new, and I am ready to reinstall it, but I am wondering about that insulation, is is necessary? Insulation in a place like that is just begging to get wet, trap water, and start rusting all over again.

I figure it is there either as thermal insulation, to keep that duct from sweating when it is drawing cold air from inside the car, in the recirc mode, or as acoustic insulation, so that the blower fan is not so noisy. Does anyone know for sure why the inside of that duct was insulated, and what will be the results if I just leave the insulation out?

Thanks for any assistance.

Chick on Sun June 21, 2009 9:45 PM User is offlineView users profile

It was for noise reduction, no one liked to buy a new car that sounded like three squirrels fighting over one acorn.. try it and see if you can live with the noise..we can't hear it from here.. I bet you can....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

dwg on Mon June 22, 2009 7:23 AM User is offline

Thanks,

I thought that is what it was, I wish I knew just how noisy it was going to be, Has anybody left this stuff out, and then regretted it?

It would be much nicer to just leave it smooth inside. Especially since I have never seen this padding for sale, and have no idea where to even get it.

On the other hand, it will be nearly impossible to install the insulation after the duct is installed, and very easy right now.

I guess I have to pay my money and take my chances.

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