Evaporator housing seal? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gibson · 02-07-2012, 11:46 PM

I removed my leaky A/C evaporator housing in an attempt to reseal it (leaks every time it rains). I've gotten it all cleaned up, but now I need to reseal the two sides and remount them to the firewall. What product should I use to create those seals? RTV? Or is there a specific product for this?
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C15_Sierra · 02-08-2012, 01:43 AM

I just did mine up with some silicone adhesive seal. I made sure to put a thick bead on and just laid it up on the firewall. I dunno how it'll hold, but I did a search before I went to town on it, and that's what people were recommending

Gibson · 02-08-2012, 08:16 AM

Did you use the same stuff to join the two halves of the box?
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homemade87 · 02-08-2012, 08:30 AM

I went to oriellys and got a role of ribbon strip like they use for installing windshields in early cars. Worked great. Just stretch it to the diameter you want. It is real close to what they used originally.

C15_Sierra · 02-08-2012, 09:07 AM

The box already came sealed, looks like they used a rubberized adhesive (probably similar to the silicone adhesive I used)

**old Rusty C10** · 02-08-2012, 09:41 AM

they used RTV Black silicone on mine when it was done last

Junqueboi · 02-08-2012, 10:02 AM

I believe the factory used 3M "Strip Calk" (that's how it's spelled). You can ask for this stuff by name at NAPA..but I think you can get it at pretty much any auto parts store.

It comes in a box & it's basically 12 inch long strips of black, sticky, claylike stuff that you just push into place. Theres a string in the middle of it to keep it from breaking apart. Really easy to work with. It doesn't ooze out & make a mess of things either.

Junqueboi · 02-08-2012, 10:13 AM

I believe the factory used 3M "Strip Calk" (that's how it's spelled). You can ask for this stuff by name at NAPA..but I think you can get it at pretty much any auto parts store.

It comes in a box & it's basically 12 inch long strips of black, sticky, claylike stuff that you just push into place. Theres a string in the middle of it to keep it from breaking apart. Really easy to work with. It doesn't ooze out & make a mess of things either.

Gibson · 02-08-2012, 10:43 AM

You guys rock - thanks! Maybe I can finally close up that huge hole in my firewall now!

88Jimmy4x4 · 04-19-2012, 10:15 PM

do you use this same stuff to wrap around ends where connections come thru to accum and hose?

crewcabsquared · 04-20-2012, 08:43 AM

Quote:

Originally Posted by 88Jimmy4x4

do you use this same stuff to wrap around ends where connections come thru to accum and hose?

Yes, just knead a few strips together to make a fat strip and install around evap. inlet and outlet. Just did mine with the strip calk, and water tested it with a hose, no leaks

88Jimmy4x4 · 04-20-2012, 05:26 PM

Thanks, installed a new evaporator today and used the 3M stuff, boy that stuff is sticky. Kinda pricey at $23 from oreilly but they give you plenty.

02-07-2012, 11:46 PM	#1
Gibson Registered User Join Date: Jul 2009 Location: Maryville, TN Posts: 132	Evaporator housing seal? I removed my leaky A/C evaporator housing in an attempt to reseal it (leaks every time it rains). I've gotten it all cleaned up, but now I need to reseal the two sides and remount them to the firewall. What product should I use to create those seals? RTV? Or is there a specific product for this? Posted via Mobile Device

02-08-2012, 01:43 AM	#2
C15_Sierra Registered User Join Date: Apr 2011 Location: Hartford CT Posts: 223	Re: Evaporator housing seal? I just did mine up with some silicone adhesive seal. I made sure to put a thick bead on and just laid it up on the firewall. I dunno how it'll hold, but I did a search before I went to town on it, and that's what people were recommending __________________ -Steve 1980 GMC C15 Sierra LWB Dark Carmine Red/Carmine Int Was: 250/3spd (1980-88), then a 305/TH350 (1988-2011) Now: 5.3/4L60E, 2.73 12-bolt open rear

02-08-2012, 08:16 AM	#3
Gibson Registered User Join Date: Jul 2009 Location: Maryville, TN Posts: 132	Re: Evaporator housing seal? Did you use the same stuff to join the two halves of the box? Posted via Mobile Device

02-08-2012, 08:30 AM	#4
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: Evaporator housing seal? I went to oriellys and got a role of ribbon strip like they use for installing windshields in early cars. Worked great. Just stretch it to the diameter you want. It is real close to what they used originally.

02-08-2012, 09:07 AM	#5
C15_Sierra Registered User Join Date: Apr 2011 Location: Hartford CT Posts: 223	Re: Evaporator housing seal? The box already came sealed, looks like they used a rubberized adhesive (probably similar to the silicone adhesive I used) __________________ -Steve 1980 GMC C15 Sierra LWB Dark Carmine Red/Carmine Int Was: 250/3spd (1980-88), then a 305/TH350 (1988-2011) Now: 5.3/4L60E, 2.73 12-bolt open rear

02-08-2012, 09:41 AM	#6
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: Evaporator housing seal? they used RTV Black silicone on mine when it was done last __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-08-2012, 10:02 AM	#7
Junqueboi Registered User Join Date: Oct 2008 Location: Leasburg, NC Posts: 55	Re: Evaporator housing seal? I believe the factory used 3M "Strip Calk" (that's how it's spelled). You can ask for this stuff by name at NAPA..but I think you can get it at pretty much any auto parts store. It comes in a box & it's basically 12 inch long strips of black, sticky, claylike stuff that you just push into place. Theres a string in the middle of it to keep it from breaking apart. Really easy to work with. It doesn't ooze out & make a mess of things either. __________________ Jel

02-08-2012, 10:13 AM	#8
Junqueboi Registered User Join Date: Oct 2008 Location: Leasburg, NC Posts: 55	Re: Evaporator housing seal? I believe the factory used 3M "Strip Calk" (that's how it's spelled). You can ask for this stuff by name at NAPA..but I think you can get it at pretty much any auto parts store. It comes in a box & it's basically 12 inch long strips of black, sticky, claylike stuff that you just push into place. Theres a string in the middle of it to keep it from breaking apart. Really easy to work with. It doesn't ooze out & make a mess of things either. __________________ Jel

02-08-2012, 10:43 AM	#9
Gibson Registered User Join Date: Jul 2009 Location: Maryville, TN Posts: 132	Re: Evaporator housing seal? You guys rock - thanks! Maybe I can finally close up that huge hole in my firewall now!

04-19-2012, 10:15 PM	#10
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: Evaporator housing seal? do you use this same stuff to wrap around ends where connections come thru to accum and hose? __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

04-20-2012, 05:26 PM	#12
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: Evaporator housing seal? Thanks, installed a new evaporator today and used the 3M stuff, boy that stuff is sticky. Kinda pricey at $23 from oreilly but they give you plenty. __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

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