Name That Mystery Rattle! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bry593 · 03-23-2021, 02:06 PM

1971 C20 with A/C.

I have a rattle, sounds like something is just hanging by a screw and banging against the firewall. This is inside the cab and sounds like it is behind the glove box and just forward of the A-pillar.

Anyone know what this rattle could be?

I've put my hand on things while driving and it does not mute the rattle. I also opened the glove box and held the door stop. No change.

Could this be an HVAC door or something? Maybe it is outside under the cowl? Sure sounds like it in the cab though...

Any advice or pointers is appreciated! Thanks!

**3757chevy** · 03-23-2021, 05:06 PM

There is a air baffle inside the cowl above the glove box. Mine was broken on my K5 . I don't remember a rattle because of it.

bry593 · 03-24-2021, 08:44 AM

Thanks!, that's a good suggestion.

I'm also going to check the fresh air door assembly on the passenger side kick panel. I took the door out a few months back to clean the crud out of the cowl.

03-23-2021, 02:06 PM	#1
bry593 Registered User Join Date: May 2016 Location: Oklahoma Posts: 201	Name That Mystery Rattle! 1971 C20 with A/C. I have a rattle, sounds like something is just hanging by a screw and banging against the firewall. This is inside the cab and sounds like it is behind the glove box and just forward of the A-pillar. Anyone know what this rattle could be? I've put my hand on things while driving and it does not mute the rattle. I also opened the glove box and held the door stop. No change. Could this be an HVAC door or something? Maybe it is outside under the cowl? Sure sounds like it in the cab though... Any advice or pointers is appreciated! Thanks! __________________ 1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs

03-23-2021, 05:06 PM	#2
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 4,060	Re: Name That Mystery Rattle! There is a air baffle inside the cowl above the glove box. Mine was broken on my K5 . I don't remember a rattle because of it. Attached Images __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

03-24-2021, 08:44 AM	#3
bry593 Registered User Join Date: May 2016 Location: Oklahoma Posts: 201	Re: Name That Mystery Rattle! Thanks!, that's a good suggestion. I'm also going to check the fresh air door assembly on the passenger side kick panel. I took the door out a few months back to clean the crud out of the cowl. __________________ 1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs



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