87 wrangler 4.2 heater core inlet & outlet - Jeep Wrangler Forum

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Old 12-27-2009, 06:57 PM   #1
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87 wrangler 4.2 heater core inlet & outlet

I just replaced my heater core a couple days ago and i think i may have mixed the hoses up. Which is the inlet on the heater core? the top or bottom line and which hose hooks to the inlet and outlet... Im not the sharpest tool in the shed but man im still tryin..... Thanks
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Old 12-27-2009, 07:24 PM   #2
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Seeing as how I have to replace mine this week I'd be interested in the answer to this one too...

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Old 12-27-2009, 08:28 PM   #3
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94cummins If you are not getting enough heat you are probably right. Just switch the hoses around and see if you get more. It won't hurt anything and only take a minute.
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Old 12-27-2009, 08:30 PM   #4
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The 3/4" nipple on engine goes to the 5/8" on the heater core. The 5/8" from engine goes to the 3/4 nipple on core. That way they hope you will go buy the factory hose @ $20 ea. I used 5/8 goodyear hose for both. Just heat the end with a hairdryer and it will fit over the 3/4 nipple. For about $8 for both.
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Old 12-28-2009, 08:29 AM   #5
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I'm not positive about this, but why would it make a difference?

The heater core wouldn't really be directional if you think about it. It's basically a length of copper tubing that's been bent & stuffed through some aluminum fins.

On mine, the (3/4") hose coming from the water pump is connected to the upper/outboard core barb. The lower/inboard barb is connected to the (5/8") hose leading to the intake manifold.
90YJ 98XJ
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