What is used to seal heater hoses to heater box on 1968 Chevy C10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HeavyHauler · 05-02-2019, 02:15 PM

I am replacing the heater hoses on my 1968 Chevy C10 shortbed 396 fleetside that did not come with air conditioning.

What is the sealant that they used to seal the heater hoses to the heater box in order to seal off the opening around the heater hose?

Could some regular caulking be used?? Maybe some of that old style automotive front windshield rope sealing be used???

**clay68c10** · 05-02-2019, 04:47 PM

I’d use pipe wrap insulating foam and maybe a little of the black sealer (dum dum, monkey $hit, windshield butyl) to keep it in place.
There’s probably a specific seal for that, like the AC evaporator case seals.

72c20customcamper · 05-02-2019, 04:55 PM

Most residential HVAC places sell the packing. I used it to seal my lines in the plenum on my central air. Very dense black rubbery roll . Single side adhesive .

External · 05-02-2019, 10:05 PM

Well I'm about to find out. After putting a coolant overflow tank on my truck, and finding what I thought to be every weak spot on the ride, now my heater core is leaking. I'm about to have an all new collant system. Live and learn I guess.

HeavyHauler · 05-03-2019, 02:24 PM

Quote:

Originally Posted by External

Well I'm about to find out. After putting a coolant overflow tank on my truck, and finding what I thought to be every weak spot on the ride, now my heater core is leaking. I'm about to have an all new collant system. Live and learn I guess.

Yeah I am going to replace my heater core in the near future also even though it is not leaking but it has most likely never been replaced.

custom10nut · 05-03-2019, 07:07 PM

I just replace my heater core last year, and I used black caulk, just to fill in the gaps. It gives it a cleaner look and it’ll be easy to remove if the need arises again

garyd1961 · 05-03-2019, 07:18 PM

I replaced mine a couple years ago and didn't use anything. Hasn't caused any problems yet.
just on a side note I used plumbers putty to seal the heater box to the firewall and it worked great.

05-02-2019, 02:15 PM	#1
HeavyHauler Registered User Join Date: Nov 2011 Location: USA Posts: 447	What is used to seal heater hoses to heater box on 1968 Chevy C10 I am replacing the heater hoses on my 1968 Chevy C10 shortbed 396 fleetside that did not come with air conditioning. What is the sealant that they used to seal the heater hoses to the heater box in order to seal off the opening around the heater hose? Could some regular caulking be used?? Maybe some of that old style automotive front windshield rope sealing be used???

05-02-2019, 04:47 PM	#2
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,995	Re: What is used to seal heater hoses to heater box on 1968 Chevy C10 I’d use pipe wrap insulating foam and maybe a little of the black sealer (dum dum, monkey $hit, windshield butyl) to keep it in place. There’s probably a specific seal for that, like the AC evaporator case seals. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

05-02-2019, 04:55 PM	#3
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 8,925	Re: What is used to seal heater hoses to heater box on 1968 Chevy C10 Most residential HVAC places sell the packing. I used it to seal my lines in the plenum on my central air. Very dense black rubbery roll . Single side adhesive . __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.

05-02-2019, 10:05 PM	#4
External Registered User Join Date: Jun 2018 Location: Louisiana Posts: 186	Re: What is used to seal heater hoses to heater box on 1968 Chevy C10 Well I'm about to find out. After putting a coolant overflow tank on my truck, and finding what I thought to be every weak spot on the ride, now my heater core is leaking. I'm about to have an all new collant system. Live and learn I guess. __________________ '72 Chevy Custom Deluxe Highlander. Med Olive/White 350/200 ps,pb and Air Conditioning!

05-03-2019, 07:07 PM	#6
custom10nut Registered User Join Date: Apr 2015 Location: East Tn (In the heart of the Smoky Mtns) Posts: 1,903	Re: What is used to seal heater hoses to heater box on 1968 Chevy C10 I just replace my heater core last year, and I used black caulk, just to fill in the gaps. It gives it a cleaner look and it’ll be easy to remove if the need arises again

05-03-2019, 07:18 PM	#7
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: What is used to seal heater hoses to heater box on 1968 Chevy C10 I replaced mine a couple years ago and didn't use anything. Hasn't caused any problems yet. just on a side note I used plumbers putty to seal the heater box to the firewall and it worked great.



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