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#1 |
Registered User
![]() Join Date: May 2010
Location: Harlem, GA
Posts: 72
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Need to bypass the heater core
What is the best way to bypass the heater core for a short time? Can I just go from the water pump straight back into the engine? My core is shot and I don't have the time to fix it just yet...more projects than time right now.
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#2 |
Registered User
![]() Join Date: May 2010
Location: Harlem, GA
Posts: 72
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Re: Need to bypass the heater core
Sorry...that heater core is on a 1970 GMC 350 without AC
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#3 |
Cops, ha, catch me if you can!
Join Date: Jun 2009
Location: Santa Barbara, CA.
Posts: 271
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Re: Need to bypass the heater core
That is the way I have it setup right now. I don't think its a problem.
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72 C-10 Stepper 350/TH350 3.73 in the back Edelbrock intake and Carb Hooker Comp Headers 275/60R15 on Rallies ![]() ![]() |
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#4 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Need to bypass the heater core
You could do that or just get some NPT pipe plugs.
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#5 |
Registered User
![]() Join Date: May 2010
Location: Harlem, GA
Posts: 72
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Re: Need to bypass the heater core
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#6 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Need to bypass the heater core
I got mine at Kragen or Autozone, one of those kind of places.
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#7 |
Registered User
![]() Join Date: May 2010
Location: Harlem, GA
Posts: 72
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Re: Need to bypass the heater core
Thanks for the quick answers guys....I will just bypass it for now and maybe get those plugs as I get around to it.
THanks again!! |
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#8 |
Gone to greener pastures
![]() Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: Need to bypass the heater core
Pipe plugs are cheap, but they may be even cheaper at Homie, Lowe's, Ace, etc.
Since the repair is only temporary, just bypassing the heater core with you existing heater hose is even cheaper still. Sometimes pulling the hose barbs to install plugs can be a real PITA if the are corroded in place. I'd just use the 3/4" hose and then just double clamp it on the 5/8" manifold hose barb. Just be sure you put some kind of anti-seize in the plug threads so you can get them out later, if you go that route.
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck Last edited by El Jay; 07-14-2010 at 02:33 AM. |
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#9 |
AMBITION
Join Date: Nov 2009
Location: Fresno Ca
Posts: 389
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Re: Need to bypass the heater core
i didnt even run my hoses to the waterpump at all i just plugged them also
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#10 |
Registered User
Join Date: Jan 2007
Location: Toronto Canada
Posts: 265
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Re: Need to bypass the heater core
Same I just plugged mine at the pump and intake. Got some nice chrome ones so it even looks good.
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#11 |
Registered User
Join Date: Jan 2008
Location: Lacombe, Alberta
Posts: 353
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Re: Need to bypass the heater core
I was kind of wondering the same thing, but mine is a 5.3L.... I don't have the heater box back in it yet and would also like to bypass or plug the outlets on the water pump.
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1968 short box stepside. 2007 5.3L 4L60, tuned w/EFI Live 2005 Silverado bucket seats. Dominator 2600's all around. Porterbuilt tubular control arms. Magnaflow 3" dual exhaust. |
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#12 | |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Need to bypass the heater core
Quote:
As already mentioned, the best way is to plug the ports at both ends. If you want a cheap and dirty fix, use the hose, but stick a short length of close-fitting dowel into one end of it first. Ray |
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#13 |
Registered User
Join Date: Mar 2007
Location: Carroll County, MD
Posts: 165
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Re: Need to bypass the heater core
What size are the plugs for the intake & water pump?
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'69 short step with dreams of being a hot rod You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape. |
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#14 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Need to bypass the heater core
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#15 |
Registered User
![]() Join Date: May 2010
Location: Harlem, GA
Posts: 72
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Not sure what has been said from someone about bypassing the thermostat...I went with the larger hose straight from the output of the engine right back into the engine...I am a newbie (and like most newbies don't understand everything) but I have only bypassed the heater core and nothing else. Started up and no leaks as of yet. I have a lot on my "plate" right now (son got his license and took over my daily driver, I am in school full-time, have a job as well) so I just needed the quickest fix I could use for now....plus I live in HELL HOT Georgia and don't need the heater core right now. I just hope I did the right thing for now
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#16 | |
Account Suspended
Join Date: Jun 2000
Location: over yonder
Posts: 14,270
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Re: Need to bypass the heater core
Quote:
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#17 |
Never Done?
![]() Join Date: May 2000
Location: Ohio
Posts: 1,435
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Re: Need to bypass the heater core
It all depends where you stick your thermostat
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#18 |
Registered User
![]() Join Date: May 2010
Location: Harlem, GA
Posts: 72
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Re: Need to bypass the heater core
I just ran the in from the heater core straight back into the engine. Nothing else was touched....two hoses made into one basically (if that makes sense)....the only thing bypassed is the heater core.
![]() Last edited by lmac1210; 07-16-2010 at 03:35 PM. |
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#19 | |
Registered User
Join Date: Nov 2007
Location: Indianapolis
Posts: 1,162
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Re: Need to bypass the heater core
Quote:
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