Non AC heater install help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wpavlis · 11-19-2017, 09:00 PM

So I have had my heater out for a while to fix the leaky heater core and to remove the sizable mouse nest within the inside section. I have the inside box restored and installed and tried to test fit the engine side box today. Does anyone have any tips for installing it? I squeezed and twisted it to get it into place, but every time the rubber seal arround the fan inlet would come off. I even glued it on using some weather strip glue I had. Maybe I need some stronger glue? If it matters it's a 68. I have the inner fender completely removed and I did not remove the hood hinge. Thanks!

Bill

saxart · 11-19-2017, 11:28 PM

I had the same issue with mine. Ended up using RVT silicone to hold the gasket to the heater box. Had to be cautious with the pre-clean, and then let it dry overnight, but it held the gasket on just fine.

Best of luck to you.

wpavlis · 11-20-2017, 12:41 AM

Thanks. Did you need to remove the hood hinge? I guess it's time to clean up the leftover residue and try the rtv.

projectking · 11-20-2017, 10:30 PM

I use 3m wetherstrip adhesive

wpavlis · 11-21-2017, 05:15 PM

That is what I used. Maybe I didn't use enough. The first time I tried the rubber ring got kinda folded over. Maybe that broke the bond so it didn't hold the second time I tried. I guess I will just try it again this weekend.

wpavlis · 12-17-2017, 11:44 PM

Wanted to say thanks to those who helped me get this done. I looked closer at how I had glued the gasket to the heater box. It looks like it had slipped upward causing it to stick out farther than it should have. I used some scrap plywood I had laying around to fix that issue.

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Once the glue set up I tried to install it again. It worked better this time, but I still couldn't get it on. I gave up an loosened the hood hinge so I could get it out of the way. Worked like a charm after that. I should mention that I used 3M strip caulk to seal it to the firewall. That stuff is sticky!

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Of course, I scratched it all up due to stubbornly refusing to loosen the hood hinge. As a result I had to mask up the area and apply some spray paint afterwords.

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I am amazed at how well the fan works without a huge mouse nest inside it! As a bonus, the cab no longer smells like mouse urine.

Thanks again for the help!

11-19-2017, 09:00 PM	#1
wpavlis Registered User Join Date: Oct 2015 Location: San Tan Valley, Arizona Posts: 313	Non AC heater install help So I have had my heater out for a while to fix the leaky heater core and to remove the sizable mouse nest within the inside section. I have the inside box restored and installed and tried to test fit the engine side box today. Does anyone have any tips for installing it? I squeezed and twisted it to get it into place, but every time the rubber seal arround the fan inlet would come off. I even glued it on using some weather strip glue I had. Maybe I need some stronger glue? If it matters it's a 68. I have the inner fender completely removed and I did not remove the hood hinge. Thanks! Bill

11-19-2017, 11:28 PM	#2
saxart Registered User Join Date: Aug 2012 Location: St. Croix River Valley, WI Posts: 795	Re: Non AC heater install help I had the same issue with mine. Ended up using RVT silicone to hold the gasket to the heater box. Had to be cautious with the pre-clean, and then let it dry overnight, but it held the gasket on just fine. Best of luck to you. __________________ Meet "Old Roy": http://67-72chevytrucks.com/vboard/s...d.php?t=707801

11-20-2017, 12:41 AM	#3
wpavlis Registered User Join Date: Oct 2015 Location: San Tan Valley, Arizona Posts: 313	Re: Non AC heater install help Thanks. Did you need to remove the hood hinge? I guess it's time to clean up the leftover residue and try the rtv.

11-20-2017, 10:30 PM	#4
projectking Registered User Join Date: Oct 2006 Location: Orland Park Il Posts: 2,041	Re: Non AC heater install help I use 3m wetherstrip adhesive __________________ 68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback

11-21-2017, 05:15 PM	#5
wpavlis Registered User Join Date: Oct 2015 Location: San Tan Valley, Arizona Posts: 313	Re: Non AC heater install help That is what I used. Maybe I didn't use enough. The first time I tried the rubber ring got kinda folded over. Maybe that broke the bond so it didn't hold the second time I tried. I guess I will just try it again this weekend.

12-17-2017, 11:44 PM	#6
wpavlis Registered User Join Date: Oct 2015 Location: San Tan Valley, Arizona Posts: 313	Re: Non AC heater install help Wanted to say thanks to those who helped me get this done. I looked closer at how I had glued the gasket to the heater box. It looks like it had slipped upward causing it to stick out farther than it should have. I used some scrap plywood I had laying around to fix that issue. Once the glue set up I tried to install it again. It worked better this time, but I still couldn't get it on. I gave up an loosened the hood hinge so I could get it out of the way. Worked like a charm after that. I should mention that I used 3M strip caulk to seal it to the firewall. That stuff is sticky! Of course, I scratched it all up due to stubbornly refusing to loosen the hood hinge. As a result I had to mask up the area and apply some spray paint afterwords. I am amazed at how well the fan works without a huge mouse nest inside it! As a bonus, the cab no longer smells like mouse urine. Thanks again for the help!



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