A/C Cab Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sinister · 10-13-2009, 05:23 PM

Is the air flap under the cowl, made of steel on an A/C cab? Got a small leak in my cab and pretty sure that's where the water's coming from, I'd like to weld it shut.

msgross · 10-13-2009, 05:46 PM

air flap under the cowl? do you mean the air vents on the sides? unless an A/C cab is totally different than non A/C i'm not picturing the area that you are talking about.

Sinister · 10-13-2009, 05:56 PM

There is an air flap under the cowl on the passenger's side, pretty sure it's vacuum operated. I can't remember if it's steel or not. If you pull the cowl you can see it on an A/C cab.

69GMCLonghorn · 10-13-2009, 06:28 PM

Ah yes, the first rain in Los Angeles in... what? 10 months? literally! Great time to start finding new leaks, and other foul weather related problems. Good luck sealing it up!

Sinister · 10-13-2009, 06:35 PM

I've been waiting for this for a while, to see if shaving my firewall cured the leak. No such luck, but I did finally find the leak, or at least I think I did.

Dynomutt · 10-13-2009, 06:46 PM

The one on my 72 is a composite or plastic. Not metal.

Well I was going to post a pic for you but it's not giving me that option for some reason....

Sinister · 10-13-2009, 06:51 PM

Quote:

Originally Posted by Dynomutt

The one on my 72 is a composite or plastic. Not metal.

Well I was going to post a pic for you but it's not giving me that option for some reason....

Thanks dude. Well, looks like I have some work to do this weekend.

cdowns · 10-13-2009, 06:56 PM

most cab leaks are from dried out drip rail caulking

Sinister · 10-13-2009, 07:02 PM

Quote:

Originally Posted by cdowns

most cab leaks are from dried out drip rail caulking

Thanks cdowns, but I think I've got it nailed now. It's leaking from under the airflap in the cowl.

69GMCLonghorn · 10-13-2009, 07:02 PM

Quote:

Originally Posted by Dynomutt

The one on my 72 is a composite or plastic. Not metal.

Well I was going to post a pic for you but it's not giving me that option for some reason....

You have to go into the "advanced" mode (there's a buttom to click on).

Dynomutt · 10-13-2009, 07:05 PM

The fresh air intake (flap) does have a rubber seal around it that might be bad. You may try replacing it before just welding it up. The "flap" comes out real easy.

No attachments while migrating to the new site server is what I read so it looks like I won't be getting that pic to you anytime soon.

Sinister · 10-13-2009, 07:15 PM

Quote:

Originally Posted by Dynomutt

The fresh air intake (flap) does have a rubber seal around it that might be bad. You may try replacing it before just welding it up. The "flap" comes out real easy.

Do you know which vendors might have that seal? I think I might just close it up anyway though. Plan on going with Vintage Air and don't need it.

Dynomutt · 10-13-2009, 07:26 PM

Quote:

Originally Posted by Sinister

Do you know which vendors might have that seal? I think I might just close it up anyway though. Plan on going with Vintage Air and don't need it.

I've seen them but don't remember where. May have even been the whole door and not just the seal. I'm going with vintage Air as well but I'm not far enough along to know if the VA unit needs a fresh air intake or not so haven't made the decision to weld mine up just yet.

Sinister · 10-13-2009, 07:46 PM

I'm like 99% sure the Vintage Air Surefit kit doesn't need it. They have the installation instructions available for download.

msgross · 10-13-2009, 10:49 PM

good info... thanks.

try photobucket for easier pic posting... upload your pics and then copy the IMG link to your text...

Richard H. · 10-14-2009, 04:43 PM

The AC vent you speak of would only leak into the fresh air plenum and what ever water there is should drain out the hole in the bottom of the plenum behind your kick panel vent unless it is clogged. The only hole I saw on my stripped cab today was in the top right corner for the antenna.
Mine is an AC cab. HTH

Sinister · 10-14-2009, 04:49 PM

Quote:

Originally Posted by Richard H.

The AC vent you speak of would only leak into the fresh air plenum and what ever water there is should drain out the hole in the bottom of the plenum behind your kick panel vent unless it is clogged. The only hole I saw on my stripped cab today was in the top right corner for the antenna.
Mine is an AC cab. HTH

That's what I thought. Kick panel is clear, but water seems to be sitting there in the plenum and leaking into the cab at a seam towards the corner. Got a little bit of rust there as well, so evidently it's been doing this for years.

Richard H. · 10-14-2009, 05:07 PM

Give me a minute ... ah here it is
http://67-72chevytrucks.com/vboard/s...d.php?t=253241
In the bottom left there is hole big enough to get your finger in or a mouse.

Sinister · 10-14-2009, 05:12 PM

Thanks for the pic.
Mine is actually leaking towards the top by the cowl. Pretty sure water is coming in at the air flap and sitting in there.

Richard H. · 10-14-2009, 05:28 PM

Quote:

Originally Posted by Sinister

Thanks for the pic.
Mine is actually leaking towards the top by the cowl. Pretty sure water is coming in at the air flap and sitting in there.

Well like I said my cab stripped and I did look for you today as I was fabbing my under dash brakes and the only other thing under there is a butt load of seam sealer.
You don't wanna here this probably but in the front the windshield 0n each side I welded all that in rather than using caulk liked they did years ago. Oh , and the top also.

Sinister · 10-14-2009, 05:34 PM

Any pics of where you welded? I'm pretty sure it's not the windshield. I went out there while it was raining and it's leaking right behind where the glovebox would go in the corner. This leak is driving me nuts.

Richard H. · 10-14-2009, 06:04 PM

Quote:

Originally Posted by Sinister

Any pics of where you welded? I'm pretty sure it's not the windshield. I went out there while it was raining and it's leaking right behind where the glovebox would go in the corner. This leak is driving me nuts.

As it should ,I will take em tomorrow in and out but I think it is your windshield area. Try this.. use masking tape and seal it off and use a water hose on it for a while. If that ain't it then do the cowl area.

Sinister · 10-14-2009, 06:15 PM

Here's a pic of where it's leaking. Under the windshield is dry.

Dynomutt · 10-14-2009, 06:43 PM

I'm not sure if that's under the fresh air intake or just beyond it but it's right in that area. that black plastic nut in your picture is the back side of the flap latch. I think I would take the flap out and just look and feel around and see what it looks like. You have to take out three 5/16" screws (just two if your A/C box is not on the firewall) and a spring loaded catch to get the flap out. My cab is at the blaster so I can't look at it for you or I would.

Sinister · 10-14-2009, 06:46 PM

I think it's just to the right of the air flap. I'm going to see what's up with it this weekend. Thanks for the help guys.

10-13-2009, 05:23 PM	#1
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	A/C Cab Question Is the air flap under the cowl, made of steel on an A/C cab? Got a small leak in my cab and pretty sure that's where the water's coming from, I'd like to weld it shut. __________________ Beat it to fit, Paint it to match... Last edited by Sinister; 10-13-2009 at 05:24 PM.

10-13-2009, 05:46 PM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: A/C Cab Question air flap under the cowl? do you mean the air vents on the sides? unless an A/C cab is totally different than non A/C i'm not picturing the area that you are talking about. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 10-13-2009 at 05:46 PM.

10-13-2009, 05:56 PM	#3
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question There is an air flap under the cowl on the passenger's side, pretty sure it's vacuum operated. I can't remember if it's steel or not. If you pull the cowl you can see it on an A/C cab. __________________ Beat it to fit, Paint it to match... Last edited by Sinister; 10-13-2009 at 05:57 PM.

10-13-2009, 06:28 PM	#4
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: A/C Cab Question Ah yes, the first rain in Los Angeles in... what? 10 months? literally! Great time to start finding new leaks, and other foul weather related problems. Good luck sealing it up!

10-13-2009, 06:35 PM	#5
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question I've been waiting for this for a while, to see if shaving my firewall cured the leak. No such luck, but I did finally find the leak, or at least I think I did. __________________ Beat it to fit, Paint it to match...

10-13-2009, 06:46 PM	#6
Dynomutt Registered User Join Date: Mar 2009 Location: North Texas Posts: 440	Re: A/C Cab Question The one on my 72 is a composite or plastic. Not metal. Well I was going to post a pic for you but it's not giving me that option for some reason.... __________________ MARQ Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=446194

10-13-2009, 06:56 PM	#8
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: A/C Cab Question most cab leaks are from dried out drip rail caulking __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-13-2009, 07:05 PM	#11
Dynomutt Registered User Join Date: Mar 2009 Location: North Texas Posts: 440	Re: A/C Cab Question The fresh air intake (flap) does have a rubber seal around it that might be bad. You may try replacing it before just welding it up. The "flap" comes out real easy. No attachments while migrating to the new site server is what I read so it looks like I won't be getting that pic to you anytime soon. __________________ MARQ Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=446194

10-13-2009, 07:46 PM	#14
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question I'm like 99% sure the Vintage Air Surefit kit doesn't need it. They have the installation instructions available for download. __________________ Beat it to fit, Paint it to match...

10-13-2009, 10:49 PM	#15
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: A/C Cab Question good info... thanks. try photobucket for easier pic posting... upload your pics and then copy the IMG link to your text... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

10-14-2009, 04:43 PM	#16
Richard H. Spanked once Join Date: Oct 2006 Location: Intheshop, Indiana Posts: 969	Re: A/C Cab Question The AC vent you speak of would only leak into the fresh air plenum and what ever water there is should drain out the hole in the bottom of the plenum behind your kick panel vent unless it is clogged. The only hole I saw on my stripped cab today was in the top right corner for the antenna. Mine is an AC cab. HTH __________________ The ole 350 budget build.

10-14-2009, 05:07 PM	#18
Richard H. Spanked once Join Date: Oct 2006 Location: Intheshop, Indiana Posts: 969	Re: A/C Cab Question Give me a minute ... ah here it is http://67-72chevytrucks.com/vboard/s...d.php?t=253241 In the bottom left there is hole big enough to get your finger in or a mouse. __________________ The ole 350 budget build.

10-14-2009, 05:12 PM	#19
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question Thanks for the pic. Mine is actually leaking towards the top by the cowl. Pretty sure water is coming in at the air flap and sitting in there. __________________ Beat it to fit, Paint it to match... Last edited by Sinister; 10-14-2009 at 05:12 PM.

10-14-2009, 05:34 PM	#21
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question Any pics of where you welded? I'm pretty sure it's not the windshield. I went out there while it was raining and it's leaking right behind where the glovebox would go in the corner. This leak is driving me nuts. __________________ Beat it to fit, Paint it to match...

10-14-2009, 06:15 PM	#23
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question Here's a pic of where it's leaking. Under the windshield is dry. __________________ Beat it to fit, Paint it to match...



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10-14-2009, 06:43 PM	#24
Dynomutt Registered User Join Date: Mar 2009 Location: North Texas Posts: 440	Re: A/C Cab Question I'm not sure if that's under the fresh air intake or just beyond it but it's right in that area. that black plastic nut in your picture is the back side of the flap latch. I think I would take the flap out and just look and feel around and see what it looks like. You have to take out three 5/16" screws (just two if your A/C box is not on the firewall) and a spring loaded catch to get the flap out. My cab is at the blaster so I can't look at it for you or I would. __________________ MARQ Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=446194 Last edited by Dynomutt; 10-14-2009 at 06:47 PM.

10-14-2009, 06:46 PM	#25
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: A/C Cab Question I think it's just to the right of the air flap. I'm going to see what's up with it this weekend. Thanks for the help guys. __________________ Beat it to fit, Paint it to match...

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