Heater Core Bypass - TCCoA Forums
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post #1 of 16 (permalink) Old 06-05-2004, 07:32 PM Thread Starter
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Heater Core Bypass

hey guys, i need some help with bypassing my heater core....i need to know what the I.D. of the 2 hoses that run to the heater core are. i have misplaced my tape measure and can't measure them for myself
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post #2 of 16 (permalink) Old 06-05-2004, 08:34 PM
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I beleive it is 5/8ths...a standard size.




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post #3 of 16 (permalink) Old 06-05-2004, 11:36 PM
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ive heard of this before, but honestly im not 100% of how it benefits the engine, can someone explain to me heater core bypass pluses, and negatives?

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post #4 of 16 (permalink) Old 06-06-2004, 12:20 AM
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The bypass does nothing for the engine. He is probaly bypassing it because it is leaking. Changing a heater core in a mn12 is a real pain

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post #5 of 16 (permalink) Old 06-06-2004, 02:05 AM
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Hi i had to do it on my tbird... it was a 89 and the hose was back left i dk all about how my dad did it for me i was dumb back then, It will not hurt the engine at all, u cannot use ur heater though i dk about ac... but u get no heat, it stops the anti freeze from going to the heater core and ending up on the passengers feet. its also about a 200+ dallor job.
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post #6 of 16 (permalink) Old 06-06-2004, 06:12 AM Thread Starter
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yes, i am doing it because it is leaking (AGAIN ), and it really pisses me off because just last year i paid the stealership to replace it....i didn't have the time or desire to try to tackle the job myself....it was an expensive job, and now here it is, leaking again

GB, one of the hoses may be 5/8, but one of the hoses is a different size...anyone know for certain the sizes of both hoses?
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post #7 of 16 (permalink) Old 06-06-2004, 10:06 AM
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Just cut one of the existing hose to route it

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post #8 of 16 (permalink) Old 06-06-2004, 01:25 PM
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Quote:
Originally posted by 95ThundaChik'n
yes, i am doing it because it is leaking (AGAIN ), and it really pisses me off because just last year i paid the stealership to replace it....i didn't have the time or desire to try to tackle the job myself....it was an expensive job, and now here it is, leaking again

GB, one of the hoses may be 5/8, but one of the hoses is a different size...anyone know for certain the sizes of both hoses?
Have you tried any sealers??? I bought an '90 Eagle Premiere in '96 with a leaking core....added some sealer....just took it off the road last fall but not for any coolant leaking problems! About 60K miles elapsed since it was put in...If I recall right it was COPPERSEAL.

Just another possible route...

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post #9 of 16 (permalink) Old 06-06-2004, 10:42 PM
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if it 'failed again' the coolant has most likely become acidic. Flush it good and replace it (the coolant) even if you don't replace the core cause you will soon be replacing more expesive parts like the radiator or worse....
IT is possible that you might have some kind of over pressure problem.. check/replace your radiator cap and beg/borrow/steal a block checker to check for blown head gaskets if it is a 3.8

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post #10 of 16 (permalink) Old 06-07-2004, 09:08 AM
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his is a 95 V8 so i dont think he has to worry all that much

1995 Ford Thunderbird 4.6 LX - SC wheels, enlarged rear sway bar, full sound system, cut mufflers, PST 1 1/8" rear bar, Eibachs, Mark 8 LCA's, Al housed 3.55 gearset, cut mufflers
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post #11 of 16 (permalink) Old 06-07-2004, 09:23 AM
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If it failed within a year I'd take it back to the dealer I paid to fix it and jump up and down on the service manager's desk. They may fix it and they may not but I'd sure feel better when I was crawling around under there fixing it right. At the price they charged to fix it I think I'd also consider filing a complaint with the BBB - http://complaints.bbb.org/Welcome.asp
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post #12 of 16 (permalink) Old 06-07-2004, 10:00 AM
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He might have a leg to stand on with the dealer if they didn't install the ground strap Ford now recommends. Worst case scenario is buy a core and do it yourself. It will cost you all of about $50

http://members.tccoa.com/timb/Heatercore.htm

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post #13 of 16 (permalink) Old 06-08-2004, 09:35 AM Thread Starter
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ok, i finally found a tape measure and measured the 2 hose barbs, and they are 2 different sizes, one is 5/8" and the other is 3/4"....i just wanna make sure that i am measuring the correct hoses. if i have it correct, in order to bypass the heater core, i would just connect the 2 hose barbs that are circled in yellow in the picture below, right?

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post #14 of 16 (permalink) Old 06-08-2004, 10:48 AM
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yeah. What I did when I bypassed mine, was to take the two hoses and get a barbed male and female fittings. What is your email? Ill email you the pic of mine.

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post #15 of 16 (permalink) Old 06-08-2004, 11:01 AM Thread Starter
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i'm just gonna connect the 2 barbs together with 1 piece each of 5/8" & 3/4" hose, with a reducing hose barb coupling between them.....i really don't feel like struggling with disconnecting the ends of the hoses that are on the barbs that run through the firewall......i just wanted to make sure i was going to be connecting the right ones
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post #16 of 16 (permalink) Old 06-19-2004, 10:17 PM
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Timb Thanks for the instructions!!! I'm printing them out right now.

The heater core just went on my 96. I just got laid off so i think i have the time to do it myself. It doesn't seem like it should take more than 4 or 5 hours. I can see why it would cost $200 to replace. I'm up for the challenge.

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