Bypass Heater Core - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ole Blue 68 · 07-09-2009, 11:25 AM

My heater core is shot and I'm thinking about ways to bypass it till I decide what I'm gonna do on the HVAC side of things. Rather than mess with the plumbing on my intake, can I just connect the inlet hose to the outlet hose?

Sinister · 07-09-2009, 11:26 AM

You can do that, but I would just plug the intake and water pump.

67chevemall · 07-09-2009, 12:07 PM

Ya the hoses are different sizes.
Buy the two plugs and screw em in.

Once I put a smaller hose inside the two hoses and used a bunch
of ring clamps to hold it all. It never leaked for years, but the plugs are better.

Ole Blue 68 · 07-09-2009, 12:35 PM

Thanks for the advice guys, I'll look into getting the plugs.

ChevLoRay · 07-09-2009, 12:41 PM

Do you have heat and AC? I know that when I pulled my unit off of my truck, I marvelled at the bits and pieces. I think I'm gonna go with aftermarket, now. Too much work to do on the firewall, and aftermarket is too clean.

Ole Blue 68 · 07-09-2009, 12:45 PM

Quote:

Originally Posted by ChevLoRay

Do you have heat and AC? I know that when I pulled my unit off of my truck, I marvelled at the bits and pieces. I think I'm gonna go with aftermarket, now. Too much work to do on the firewall, and aftermarket is too clean.

Nope. I'd have to replace at least the compressor, heater core, blower motor and the control unit to get it up and running again. So, like you, I'm thinking more and more about aftermarket.

Texasbigblock · 07-09-2009, 03:58 PM

dayco makes a brass nipple that has 3/4 on one side and 5/8 on the other.......check your local parts store. just connect the two.

07-09-2009, 11:25 AM	#1
Ole Blue 68 Registered User Join Date: Aug 2005 Location: Philly Posts: 1,140	Bypass Heater Core My heater core is shot and I'm thinking about ways to bypass it till I decide what I'm gonna do on the HVAC side of things. Rather than mess with the plumbing on my intake, can I just connect the inlet hose to the outlet hose?

07-09-2009, 11:26 AM	#2
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: Bypass Heater Core You can do that, but I would just plug the intake and water pump. __________________ Beat it to fit, Paint it to match...

07-09-2009, 12:07 PM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: Bypass Heater Core Ya the hoses are different sizes. Buy the two plugs and screw em in. Once I put a smaller hose inside the two hoses and used a bunch of ring clamps to hold it all. It never leaked for years, but the plugs are better. __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

07-09-2009, 12:35 PM	#4
Ole Blue 68 Registered User Join Date: Aug 2005 Location: Philly Posts: 1,140	Re: Bypass Heater Core Thanks for the advice guys, I'll look into getting the plugs.

07-09-2009, 12:41 PM	#5
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Bypass Heater Core Do you have heat and AC? I know that when I pulled my unit off of my truck, I marvelled at the bits and pieces. I think I'm gonna go with aftermarket, now. Too much work to do on the firewall, and aftermarket is too clean. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

07-09-2009, 03:58 PM	#7
Texasbigblock Registered User Join Date: Mar 2007 Location: Texas Posts: 252	Re: Bypass Heater Core dayco makes a brass nipple that has 3/4 on one side and 5/8 on the other.......check your local parts store. just connect the two. __________________ -Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia"

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