Possible heater core leak ? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Possible heater core leak ?

Rampage Bowless Soft Top Oconee offroadAlloy USA Still AvailableAdvance Adapters SYE Kits

Reply
Unread 06-10-2013, 05:37 PM   #1
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,565
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

__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote Quick reply to this message
Unread 06-10-2013, 05:49 PM   #2
Reno72
Senior Member
1992 YJ Wrangler 
 
Join Date: Jan 2013
Location: Cardiff by the Sea - Glamis North, Ca
Posts: 623
Sounds like the heater core to me....sorry
Reno72 is offline   Reply With Quote Quick reply to this message
Unread 06-10-2013, 05:51 PM   #3
bigbossd1030
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB, Alberta
Posts: 2,515
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.
__________________
[COLOR="DarkGreen"]/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)[/COLOR]
[COLOR="Blue"]OFFICIAL JEEPER[/COLOR]
[COLOR="Red"]Any Jeepers in Edmonton, AB
I am on channel 33.[/COLOR]
I live, I ride, I am JEEP.
bigbossd1030 is offline   Reply With Quote Quick reply to this message
Unread 06-10-2013, 05:53 PM   #4
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,565
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)
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote Quick reply to this message
Unread 06-10-2013, 06:13 PM   #5
bigbossd1030
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB, Alberta
Posts: 2,515
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.
__________________
[COLOR="DarkGreen"]/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)[/COLOR]
[COLOR="Blue"]OFFICIAL JEEPER[/COLOR]
[COLOR="Red"]Any Jeepers in Edmonton, AB
I am on channel 33.[/COLOR]
I live, I ride, I am JEEP.
bigbossd1030 is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 08:40 AM   #6
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,565
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.
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 08:53 AM   #7
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,094
Just bypass it under the hood, fix it when it starts getting cold again.
__________________
418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 09:20 AM   #8
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,565
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
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 09:38 AM   #9
Rproject
Web Wheeler
 
Rproject's Avatar
1987 YJ Wrangler 
 
Join Date: Aug 2008
Location: Sandwich, IL
Posts: 2,769
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.
__________________
1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ

The "sideways" build thread: http://www.jeepforum.com/forum/f22/r...hread-2164793/
Rproject is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 10:22 AM   #10
RobzRidez
Registered User
1990 YJ Wrangler 
 
Join Date: Apr 2013
Location: Xenia, Oh
Posts: 67
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...
rsz_s7300482.jpg  
__________________
90 YJ Islander*Nuttered4.2*MC2150*4" RE Lift*BESRK 1" Boom Shackles*33x12.5x15 BF MTs*Spyder bumper*
RobzRidez is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 11:28 AM   #11
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,565
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
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 11:34 AM   #12
Rproject
Web Wheeler
 
Rproject's Avatar
1987 YJ Wrangler 
 
Join Date: Aug 2008
Location: Sandwich, IL
Posts: 2,769
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.
__________________
1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ

The "sideways" build thread: http://www.jeepforum.com/forum/f22/r...hread-2164793/
Rproject is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 11:43 AM   #13
idaholtby
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Write up for heater core replacement .....
http://www.jeepforum.com/forum/f12/heater-core-219329/
idaholtby is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 12:05 PM   #14
Tom95YJ
[] Eye'd Jeep Connoisseur
 
Tom95YJ's Avatar
1999 XJ Cherokee 
 
Join Date: Sep 2004
Location: Salt Lake City, Utah
Posts: 8,565
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
__________________
'89 YJ The Smurf Build Thread
'99 XJ Black Betty Build Thread
Tom95YJ is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 12:10 PM   #15
idaholtby
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
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.
idaholtby is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.