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Old 05-05-2014, 12:23 PM   #1
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Heater core bypass

Just installed electric fans, aluminum radiator, 68 degree thermostat, 3G alternator. Everything's running smooth except my heater core appears to be leaking. Is the best or easiest way to bypass to just pull one end off at the firewall and reattach one single hose connecting both metal lines coming from the intake? I'm at work now and will be sitting in traffic going home. Looking for a way to assure I'm not gonna be stuck on the side of the road.
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Old 05-05-2014, 08:14 PM   #2
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The metal heater tubes are 2 different sizes the inlet tube is 3/4" and the outlet tube is 5/8" so you just can't take one of the hoses and bypass the heater core.

You can drive your car even if the heater core is leaking you won't run out of coolant unless you're going to drive a couple of hundred miles with that leak from the heater core.
I suggest to drive home and if you find a Autozone or Napa Auto on your way stop and get a U-Shaped hose that is 3/4"on one end and 5?8" on the other and the drive home and do the hose swap.

You can go to Auto Zone and buy hose number B87629, it’s about $8.00 cut about 1" off and it fits perfectly.
Or
Napa Item: Hose - Radiator Upper (U-shaped bypass hose)
Product Number: NBH10743
Price: 7.49

The parts number change occasionally but if you ask for a U-shaped hose 3/4" on one end and 5/8" you've got the hose that you need to do the heater core delete.
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Old 05-05-2014, 09:04 PM   #3
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Man, I took a piece of electrical conduit and cut it about 3 inches and then hose clamped the two hoses together with the conduit and it worked flawlessly for months until I found time to install a new heater core. No joke, its not a big deal. An 1/8” can be compensated for with tight enough hose clamps. Actually, its was a conduit elbow that was cut a few inches. Ill post a pic if I can find it.
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Old 05-06-2014, 09:20 AM   #4
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I ended up getting a piece of PVC that was 5/8-3/4 and just clamped em together. Made it home in traffic with no problem. I mainly just didn't want it to really blow out when I was in traffic. It was just a small leak but I didn't know how it was gonna act yet with the new electric fans.
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Old 05-07-2014, 12:21 AM   #5
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They make nipples like that to bypass it. I had to do it to mine when all my coolant was disappearing.

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