Possible heater core leak ? - JeepForum.com
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post #1 of 17 Old 06-10-2013, 05:37 PM Thread Starter
Tom95YJ
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This morning on my way to work (6 mile commute ). I was sitting at a red light and notice steam coming from my defroster vent and it had the sweet coolant smell. So I looked on the ps floor pan to find a small puddle. I thought my heater core had took a crap on me. Once I arrived at work I had topped off the coolant. On my way home from work it did not emit any steam or leak any coolant does anyone have any Idea what the issue could be before I rip out the heater box and replace everything ?

Btw it's on the 89 with 4.2l. The temp gauge reads 195. The entire time


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post #2 of 17 Old 06-10-2013, 05:49 PM
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Sounds like the heater core to me....sorry
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post #3 of 17 Old 06-10-2013, 05:51 PM
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Quote:
Originally Posted by Tom95YJ
This morning on my way to work (6 mile commute ). I was sitting at a red light and notice steam coming from my defroster vent and it had the sweet coolant smell. So I looked on the ps floor pan to find a small puddle. I thought my heater core had took a crap on me. Once I arrived at work I had topped off the coolant. On my way one from work it did not emit any steam or leak any coolant does anyone have any Idea what the issue could be before I rip out the heater box and replace everything ?

Btw it's on the 89 with 4.2l. The temp gauge reads 195. The entire time
Have you ever replaced the heater core before? Check the hoses on the firewall under the hood and make sure they are connected nice and tight. It's possible that a piece of debris has clogged the hole. It's not a hard job to take out the heater core. The bolts for the blower housing are all on the firewall side and are easy to reach. Steam is a good sign of a heater core taking a crap all over the place.

Sent from my iPhone, probably because I am bored at work.

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post #4 of 17 Old 06-10-2013, 05:53 PM Thread Starter
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Quote:
Originally Posted by bigbossd1030

Have you ever replaced the heater core before? Check the hoses on the firewall under the hood and make sure they are connected nice and tight. It's possible that a piece of debris has clogged the hole. It's not a hard job to take out the heater core. The bolts for the blower housing are all on the firewall side and are easy to reach. Steam is a good sign of a heater core taking a crap all over the place.

Sent from my iPhone, probably because I am bored at work.
The hoses are good on the underhood side I have replaced a heater core before but it was a task (94 z28)

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post #5 of 17 Old 06-10-2013, 06:13 PM
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Quote:
Originally Posted by Tom95YJ

The hoses are good on the underhood side I have replaced a heater core before but it was a task (94 z28)
Ok I would bet this is the heater core and this one will be a cake walk. The hardest part was making sure the defroster vent lined up right and all the cables.

Sent from my iPhone, probably because I am bored at work.

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post #6 of 17 Old 06-13-2013, 08:40 AM Thread Starter
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Well I am 100% positive it's the heater core. I didn't leak for a few days. But it did leak some more today. I noticed that it leaks when I take the rpm upto 3000 it will start to leak when I shift at 2200 it will not leak.

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post #7 of 17 Old 06-13-2013, 08:53 AM
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Just bypass it under the hood, fix it when it starts getting cold again.

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post #8 of 17 Old 06-13-2013, 09:20 AM Thread Starter
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Quote:
Originally Posted by Old4X
Just bypass it under the hood, fix it when it starts getting cold again.
I'll probably bypass it tonight after work then when I get time next weekend I will replace the core and do the blazer motor swap

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post #9 of 17 Old 06-13-2013, 09:38 AM
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Mine was doing the same thing. Do you have a/c on your rig? If so, the a/c system has to be unbolted and moved out of the way to get the heater duct out. I never have, nor will I ever, use my a/c, so I took the opportunity to rip mine out. Made the job easier and gave me a spot to mount my CB. LOL

The hardest part I had was lining up the blend door. Dang thing kept wanting to fall to the side as I put the cover back on the duct. Took a couple tries, but I got it to go.

Good luck.

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post #10 of 17 Old 06-13-2013, 10:22 AM
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Just bypassed mine last night, cake walk! Connector was $2.99, its a 3/4" to 1/2" FYI. Gonna replace the core later and do the bronco blower swap at same time and after reading maybe ripping out the ac system...
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post #11 of 17 Old 06-13-2013, 11:28 AM Thread Starter
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Quote:
Originally Posted by Rproject
Mine was doing the same thing. Do you have a/c on your rig? If so, the a/c system has to be unbolted and moved out of the way to get the heater duct out. I never have, nor will I ever, use my a/c, so I took the opportunity to rip mine out. Made the job easier and gave me a spot to mount my CB. LOL

The hardest part I had was lining up the blend door. Dang thing kept wanting to fall to the side as I put the cover back on the duct. Took a couple tries, but I got it to go.

Good luck.
I don't have ac. So that's not an issue only sissys need ac in wranglers

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post #12 of 17 Old 06-13-2013, 11:34 AM
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Quote:
Originally Posted by Tom95YJ View Post
I don't have ac. So that's not an issue only sissys need ac in wranglers
Hence the reason I pulled mine.

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post #13 of 17 Old 06-13-2013, 11:43 AM
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Write up for heater core replacement .....
http://www.jeepforum.com/forum/f12/heater-core-219329/
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post #14 of 17 Old 06-13-2013, 12:05 PM Thread Starter
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Quote:
Originally Posted by idaholtby
Write up for heater core replacement .....
http://www.jeepforum.com/forum/f12/heater-core-219329/
Thanks for the link but I've replaced a blower motor on my 95 Yj so I know how it comes out already

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post #15 of 17 Old 06-13-2013, 12:10 PM
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Quote:
Originally Posted by Tom95YJ View Post
Thanks for the link but I've replaced a blower motor on my 95 Yj so I know how it comes out already
If you are already up to speed on this then great, perhaps then this will help others with the same issue who are reading this thread.
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