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Old 04-10-2003, 08:30 AM
12013134 12013134 is offline
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Exclamation Bypass heater core on the fly

My commute into the office was more difficult than usual because of the fumes pouring out of the vents. I have a 1997 F-150 5.4 V8. should I remove both in and out hoses from the firewall and connect them with a plastic fitting not to risk breaking the aluminum fittings on the motor?(There is an advanced a mile away) OR is it possible for me to remove the in hose from the firewall and remove the outhose from the motor, and run the in hose directly into the motor. Are the fittings the same and can I do that with limited time and tools?

Thanks for anything,
Robert
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Old 04-10-2003, 01:15 PM
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Bypass heater core on the fly

Hi 12013134 and welcome to FTE

Unfortunately the heater hoses have a quick coupler sorta thing where they go on to the heater core so you cant really just unhook them and join them together. You could maybe pick up a piece of heater hose and a couple clamps and remove the original heater hoses from the engine and join them together with that.
Or maybe take a couple needlenose Vise-Grips and pinch off both heater hoses until you can get the core replaced. Or just try some Bars-Leak and see if that stops the leak for now.
And be prepared for lots of work or lots of money if you get someone else to replace the core.....you have to remove the whole dash to get at it
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Old 04-11-2003, 09:37 AM
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Bypass heater core on the fly

You are right about the quick disconnect couplers. I stopped by the bumper to bumper last night and grabbed a couple of 5/8 flush T’s and some hose clamps for a couple bucks. I tossed one in my toolbox for future use (putting the hoses back together after core replacement). I drained half the coolant, cut the hoses and joined the two ends coming from the motor with a flush T. That should give me some time to plan this project. I had a friend look it up on Mitchell Direct and it estimates 10 hours service to replace a heater core . I’m not shuckin’ out $500 to pun in a $40 part. If you know any tips and tricks please give em’ up. Anyway, I live in Louisiana so I wont need the heater for a while.

Thanks again for the heads up Racerguy.
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Old 04-11-2003, 12:29 PM
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Bypass heater core on the fly

I don't recommend bars leak. It leaves a residue on the entire cooling system, which could cause cooling problems later, or even get in the new heater core and plug it. You don't want to pinch off the hoses either. There needs to be circulation, that's why the factory uses a bypass valve on some heater cores, not a shut off valve.
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Old 04-11-2003, 05:33 PM
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Bypass heater core on the fly

I dont really like Bars-leak either but it does serve a purpose and can usually be flushed out without leaving any permanent damage.
I believe the block has a coolant bypass built in behind the water pump as coolant needs to circulate when the thermostat is closed so pinching the heater hoses shouldnt cause any problems. Correct me if I'm wrong though
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Old 04-11-2003, 05:37 PM
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Bypass heater core on the fly

Be careful about just routing those heater hoses into each other. The flow from the water pump will take the path of least resistance, which could wind up being through your bypass instead of through the rest of the cooling system. While it's probably fine on a stock motor, we smoked a 302 race motor using a bypass hose. Now we plug them off instead.
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Old 11-27-2013, 12:03 PM
Seanan Effin Thames Seanan Effin Thames is offline
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bypass or replace heater core

About a year ago my fiancé and I replaced the heater core on my 89 bronco II. After receiving a quote of $500 from a mechanic we knew, we were shocked. SO, we took out the glove box and some carpet (easy as pie), accessed the heater core from there and under the hood. All in all, the new core cost about 20$, with him under the hood and myself under the dash, it took 30 minutes to remove and replace. Do not! I repeat, do not pay a mechanic if you have a decent collection of tools and a free half hour in a day. Going to do the same to our F-150 today, granted for a bit more in part cost, but you can't beat $40 and a half hour compared to $500 and a two day wait to have your wheels back!
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Old 11-27-2013, 12:50 PM
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Quote:
Originally Posted by Seanan Effin Thames View Post
About a year ago my fiancé and I replaced the heater core on my 89 bronco II. After receiving a quote of $500 from a mechanic we knew, we were shocked. SO, we took out the glove box and some carpet (easy as pie), accessed the heater core from there and under the hood. All in all, the new core cost about 20$, with him under the hood and myself under the dash, it took 30 minutes to remove and replace. Do not! I repeat, do not pay a mechanic if you have a decent collection of tools and a free half hour in a day. Going to do the same to our F-150 today, granted for a bit more in part cost, but you can't beat $40 and a half hour compared to $500 and a two day wait to have your wheels back!
Let us know how that works out with your F-150. Especially if it's a 97 or later F-150 pertinent to this forum. I'm gonna wager a bet that you'll take longer than 30 minutes this go round if it's a truck from the model years including in this particular forum......not a 1989 Bronco II. The heater core replacement on these trucks is legendary compared to the older trucks. I did mine last fall....took me about 7 or 8 hours over the course of three days. My brother's 94 Ranger took about 20 minutes. Trust me, there is a difference.
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Old 11-27-2013, 02:41 PM
Seanan Effin Thames Seanan Effin Thames is offline
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Thanks for the info Doc. Hopefully it won't be such a big job. Crossing my fingers and doing more research before disassembly. Will update soon

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Let us know how that works out with your F-150. Especially if it's a 97 or later F-150 pertinent to this forum. I'm gonna wager a bet that you'll take longer than 30 minutes this go round if it's a truck from the model years including in this particular forum......not a 1989 Bronco II. The heater core replacement on these trucks is legendary compared to the older trucks. I did mine last fall....took me about 7 or 8 hours over the course of three days. My brother's 94 Ranger took about 20 minutes. Trust me, there is a difference.
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Old 11-27-2013, 02:41 PM
 
 
 
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