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Old 12-23-2013, 07:26 PM   #1
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Luke warm heat ( help )

I have done the thermostat , radiator flush , flushed the heater core , the blend door seems to be working. Air seems to blow harder when on the cold side but on the warm side it blows slower. I have no idea what's going on , can anyone help ? I have a 2002 TJ

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Old 12-23-2013, 09:07 PM   #2
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Could be your heater core is block on the NON coolant side....... the side the air is drawn in on....... get it out and see if it is clogged.....

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Old 12-23-2013, 09:17 PM   #3
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I was thinking the same thing. Sometimes the area around the core gets full of crap like leaves, hair, dust... and needs to be cleaned out.
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Old 12-23-2013, 10:52 PM   #4
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Is your TJ running at the normal 210 temp? If not did you install the correct 195 degree thermostat?
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Old 12-24-2013, 07:56 AM   #5
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Originally Posted by Jerry Bransford View Post
Is your TJ running at the normal 210 temp? If not did you install the correct 195 degree thermostat?
it's running right at 210 - I put a fail safe stat in . I flushed the heater core again last night with vinegar and let it sit in the core for about 1/2 hour . It seemed to help a little . Should I use clr ? I'm thinking that it is a core issue. I'll use some of the tips you guys gave me and check it out today . Thanks
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Old 12-24-2013, 09:26 AM   #6
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Originally Posted by Juttstj View Post
it's running right at 210 - I put a fail safe stat in . I flushed the heater core again last night with vinegar and let it sit in the core for about 1/2 hour . It seemed to help a little . Should I use clr ? I'm thinking that it is a core issue. I'll use some of the tips you guys gave me and check it out today . Thanks
Probably a clogged heater core then, your idea to flush it more thoroughly is a good one.

And the very last type of thermostat you want to install is a fail safe. They very commonly fail prematurely in the open position which will cause the engine to not warm up properly. A good standard 195 degree thermostat like from Stant is all you need.

If you can find a vented thermostat like the one below on the left, that would be good. Or drill a hole in the flange like the one on the right. The hole allows air that is trapped in the cooling system to escape more easily, position it at the very top when mounting the termostat.
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Old 12-24-2013, 02:59 PM   #7
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I flushed my heater core in June, it finally got cold and my heat got Luke warm. Just last night reflushed it, both ways, and a TON more gunk came out. Jeep feels like a furnace now. Just my experience
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Old 12-26-2013, 07:20 PM   #8
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Thanks for the advice - I have been stuck at work doing double shifts - Saturday night I'll put a different stat in and flush the core one more time. Does any one have any good advice on flushing the core ? Like using clr or something else ?
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Old 12-26-2013, 08:33 PM   #9
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I was thinking the same thing.
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Old 12-28-2013, 10:53 AM   #10
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I just completed a heater core flush and still blows cold air at idle. Used CLR and let it soak in core for 30 minutes then did a 25 minute flush. Is it possible that there is air in the system and would that cause an issue? Or could the core just be in need of replacement?
Thanks for this great forum!!
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Old 12-28-2013, 11:52 AM   #11
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First make sure your hoses to the heater core are hot, if they are continue as below. If they aren't change your thermostat..

How to flush the heater core:

Go to hardware store and get a 2' piece of 5/8" hose and a 2'piece of 3/4" hose, two female garden hose couplers, and two hose clamps to fit over the hoses..

Pull the stock hoses off of the heater core, clamp on the new hoses that you just bought (with the garden hose coupler connected on the ends)

Connect the garden hose from your house onto the bottom hose and run it full blast till the water comes out clean

Then connect garden hose to the top hose and run it full blast till it comes out clear

Do it again on them back and forth a few times each, more and more gunk will keep coming out..

Once it does finally come out clear, reconnect stock hoses and fire up the Jeep.

You should have heat!
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Old 12-28-2013, 03:34 PM   #12
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Thanks Rob

Ok......did the above and flushed from both top and bottom twice, water clear. Thermostat/ temp gauge is holding at 195.
Both hoses (top and bottom ) seem to be hot but only blowing warm...not hot air. Still feel like I am missing something and open to ideas.

Dave
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Old 12-28-2013, 04:06 PM   #13
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Old 12-28-2013, 04:59 PM   #14
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Quote:
Originally Posted by Dave99tjindy View Post
Thanks Rob

Ok......did the above and flushed from both top and bottom twice, water clear. Thermostat/ temp gauge is holding at 195.
Both hoses (top and bottom ) seem to be hot but only blowing warm...not hot air. Still feel like I am missing something and open to ideas.

Dave
The most likely item left is the blend door that lets heat in from the heater core. When not blocked by gunk somewhere, the heater core is always hot & that blend door is what opens to let heat into the passenger compartment. There are also some vacuum actuated components in the HVAC system so that could also be the problem if it's not the blend door.

Here's a kit from Dorman that fixes the blend door... http://www.dormanproducts.com/digita...902-326_IS.PDF

This Google search result has a lot of good info... https://www.google.com/#q=repairing+Wrangler+blend+door

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