No Heat! - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-27-2012, 09:16 PM   #1
Newb
 
Join Date: Jul 2010
Location: Ohio
Posts: 8
No Heat!

All winter my heater has been blowing luke warm air and when it's below 30 F. you can barely feel it. I changed the thermostat and nothing, blowing the same cold air. Antifreeze is fine and it blows out okay, just cold. Any ideas?

kchulo is offline   Quote Quick Reply
Old 01-27-2012, 09:33 PM   #2
Jeeper
 
Tom125's Avatar
 
Join Date: Oct 2011
Location: Akron,Ohio
Posts: 159
Sounds like a plugged heater core. Maybe try flushing the system or changing the heater core.

__________________
Tom 97 TJ
Tom125 is offline   Quote Quick Reply
Old 01-27-2012, 09:41 PM   #3
Newb
 
Join Date: Jul 2010
Location: Ohio
Posts: 8
How do I flush the system? I'm not too knowledgable about certain things. Thanks!
kchulo is offline   Quote Quick Reply
Old 01-27-2012, 10:50 PM   #4
Jeeper
 
Tom125's Avatar
 
Join Date: Oct 2011
Location: Akron,Ohio
Posts: 159
pm sent.
__________________
Tom 97 TJ
Tom125 is offline   Quote Quick Reply
Old 01-28-2012, 12:06 AM   #5
Jeeper
 
Join Date: Jan 2012
Posts: 209
+1 on the plugged heater core.

I have a 06' and in Michigan on the coldest days, my heater will just about put 3 rd degree burns on my feet....and thats having a soft top. These TJ's are a whole lot different for heat than my old CJ's from the late 70's.
timberland is offline   Quote Quick Reply
Old 01-28-2012, 12:08 AM   #6
Jeeper
 
AntiTrust's Avatar
 
Join Date: Oct 2011
Location: charlottesville
Posts: 505
hook a hose to one end.. open the other and flush flush flush
AntiTrust is offline   Quote Quick Reply
Old 01-28-2012, 12:14 AM   #7
Jeeper
 
Join Date: Jul 2011
Posts: 274
I think I've got the same problem hoed u fix it?
Cole 33 is offline   Quote Quick Reply
Old 01-28-2012, 04:51 AM   #8
Jeeper
 
Join Date: Nov 2011
Location: New Jersey
Posts: 183
make sure you have a air hole in the t stat and place it at 12 oclock ,, if not you may be air bound .
i fought this for a week , i flushed and flushed with no help then i drilled a small hole ,, now all good
junkmanted is offline   Quote Quick Reply
Old 01-28-2012, 07:39 AM   #9
Jeeper
 
Join Date: Nov 2011
Posts: 717
hand test

Warm up the vehicle and check the hoses by hand.

Before the thermostat opens there should be coolant flow through the heater hoses. As the temp gets up to normal that supply hose from the engine should be too hot to hold tight. Maybe hold loosely. The return hose from the heater (with the fan blowing strong) should be somewhat cooler and comfortable to hold. If it is not very warm coming out, but hot going in, then you have restricted flow in the heater.

You need to be somewhat careful if back flushing the heater with a hose, as there is a lot more pressure from a garden hose if the system is plugged.

If there is restricted flow there can be a couple reasons. There can be a restriction in the hoses. That would usually be where the water enters and a flap of the inside of the hose as come loose and is blocking.

If I had a restricted core, I would get some solvent for flushing radiators. Remove both heater hoses at the engine. Pour the solvent into the one hose and keep the other one high. You want both hoses above the heater. Once you have filled them, let them sit for a period. Then flush and see how much flow you have.

Also, check and make sure you got a good thermostat. When it opens the top heater hose should heat up to where you cannot hold it. If not, then it is opening too soon.
ballistx is offline   Quote Quick Reply
Old 01-28-2012, 08:07 AM   #10
Jeeper
 
Cajunjay21's Avatar
 
Join Date: Nov 2011
Posts: 27
I just had my heater core changed last week. $45 for the core and $400 to install it. But now my instrument panel lights aren't working. I took it back, and they cannot figure it out. Any ideas?
Cajunjay21 is offline   Quote Quick Reply
Old 01-28-2012, 09:01 AM   #11
Jeeper
 
NC10735285's Avatar
 
Join Date: May 2011
Location: Just outside Charlotte NC
Posts: 125
Send a message via Yahoo to NC10735285
I had the exact same problem a few months back -

I did the "hand test" and realized that indeed my heater core had become somewhat clogged - but not blocked (there is a difference).

Started off by buying two 5/8 inch hose splice kits each including two clamps and one brass insert each.

My remedy was to cut both hoses (1 one intake and 1 exhaust) from the heather core. I then proceeded to use a garden hose to flush out the heater core (you wouldn't believe the crud that came out of there). When I flushed, I did a multi directional thing, switching back and forth on both hoses.

I also use an air compressor to blow out more crud.

After the air, I poured some CLR into the heater core and let it soak for about 20 minutes. If you thought you flushed curd from the heater core withe the initial water and air - wait till you see what CLR does........ After the soak, I flushed, and flushed again withe wather and compressed air.

Total time counting soaking was about 40 min

Once I got nothing but good clean water going both directions, I spliced my hoses together. Brought the engine up to temp, checked for leaks -and now have had HOT air (not warm - unless I want it) - double checked the fluid level and haven't looked back

NOTE -the CLR was used in the heater core ONLY - and did not make contact with any other internal parts......

Good luck
NC10735285 is offline   Quote Quick Reply
Old 01-28-2012, 09:21 PM   #12
Jeeper
 
Join Date: Nov 2011
Location: Iowa
Posts: 19
I had the same problem, I flushed my heater core and have great heat now. I posted a pic of what I set up for flushing it.

http://www.wranglerforum.com/f5/clog...re-134163.html

Here's a link to the post. Hope it helps!
Jim
Catmechanic is offline   Quote Quick Reply
Old 01-28-2012, 09:25 PM   #13
Jeeper
 
Pontiackid87's Avatar
 
Join Date: May 2010
Location: downingtown pa
Posts: 661
Check your coolant level.. if its eating or leaking coolant you will lose heat.
__________________
2000 wrangler
06 Pontiac solstice
84 IMSA fiero
2002 300M special
Pontiackid87 is offline   Quote Quick Reply
Old 02-12-2012, 11:12 AM   #14
Jeeper
 
eScott's Avatar
 
Join Date: Nov 2011
Posts: 59
Quote:
Originally Posted by ballistx View Post
Warm up the vehicle and check the hoses by hand.

Before the thermostat opens there should be coolant flow through the heater hoses. As the temp gets up to normal that supply hose from the engine should be too hot to hold tight. Maybe hold loosely. The return hose from the heater (with the fan blowing strong) should be somewhat cooler and comfortable to hold. If it is not very warm coming out, but hot going in, then you have restricted flow in the heater.

You need to be somewhat careful if back flushing the heater with a hose, as there is a lot more pressure from a garden hose if the system is plugged.

If there is restricted flow there can be a couple reasons. There can be a restriction in the hoses. That would usually be where the water enters and a flap of the inside of the hose as come loose and is blocking.

If I had a restricted core, I would get some solvent for flushing radiators. Remove both heater hoses at the engine. Pour the solvent into the one hose and keep the other one high. You want both hoses above the heater. Once you have filled them, let them sit for a period. Then flush and see how much flow you have.

Also, check and make sure you got a good thermostat. When it opens the top heater hose should heat up to where you cannot hold it. If not, then it is opening too soon.
My heater isn't blowing hot air, and after bringing the jeep up to operating temp neither of my heater hoses are hot. Does this sound like a blocked heater core? I'm going to try and flush it this afternoon, but I also don't hear the blend door opening and closing when I adjust the temp control.
eScott is offline   Quote Quick Reply
Old 02-12-2012, 11:32 AM   #15
Jeeper
 
Join Date: Nov 2011
Posts: 717
could be

If the rest of the system is working OK, then it is likely a blocked heater core, as compared to a restricted one. If it is blocked, you may have an issue where there is a flap of the inner layer of the heater hose blocking the entrance.

First try one of the methods of flushing the heater core. You can also disconnect the hoses from the engine to perform it. If you have flow in one direction and not the other, it is likely a flap inside the hose. If the hoses are questionable at all, it is cheap, and best, to replace them.

If it is blocked, I would try and soak it. Drop the hose ends to below the heater and drain out as much liquid as possible. Raise the hose ends above the heater and pour in the clr. Leave sit for 30 minutes. Then drop one hose below the heater into a bucket and see what comes out.

If about at much water as the heater core would hold comes out, then you can apply water to the top hose and see what comes out. You can switch back and forth between the hoses and you don't have to buy the flush kit.

Of course the flush kit gives more control and is somewhat easier.
ballistx is offline   Quote Quick Reply
Old 02-12-2012, 04:49 PM   #16
Jeeper
 
eScott's Avatar
 
Join Date: Nov 2011
Posts: 59
Thanks for the reply. My heater core is defiantly blocked, so I have it soaking in CLR now. The hoses are fairly new since the PO replaced the motor, radiator and hoses about 64k miles ago. Hopefully this will fix the problem, although I rarely need a heater it would be nice for it to work.

eScott is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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 email address for yourself.
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

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Does anyones YJ have really good heat? YJman YJ General Discussion Forum 17 10-31-2011 06:51 PM
Exhaust Manifold Heat Shield Question. 01TJSE TJ General Discussion Forum 5 04-13-2011 04:29 PM
98 TJ too much heat!!! Oldfart TJ Tech Forum 15 07-07-2010 12:10 AM
Any HVAC technicians here? mrcarcrazy Off-Topic 19 02-05-2010 03:23 PM
87 jeep wrangler heat issues. 94cummins YJ Tech Forum 9 12-30-2009 08:10 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:35 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC