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Old 11-02-2011, 12:52 PM   #1
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Heater not working

Hey, on the first cold day here I tried to use my heater and found out that I am only getting cold air. I don't know if the temperature slide is broken or what but it is getting cold here and I will be wanting to use it. I don't really know where to begin so I would appreciate some input. Thanks!

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Old 11-02-2011, 01:14 PM   #2
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Ours didn't work. Replaced the thermostat still didn't work. Took the heater hoses off the heater core. Flushed out the core with a garden hose. A bunch of crude came out. Heater works great now.

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Old 11-02-2011, 01:20 PM   #3
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I am the farthest thing possible from a mechanic so could you explain that in detail please?
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Old 11-02-2011, 05:00 PM   #4
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Sure there are two around 1" thick black hoses that run into the passenger side firewall. They are your heater hoses. Loosen the clamps and remove them. Make a note of which hose is connected where. Take your garden hose and place it in the lower outlet. Turn the hose on and watch what comes out of the top outlet. Switch back and forth a few times to flush the heater core out. Hook the hoses back up and see if that fixes it. I found a picture that shows the hoses. The two to the right one on top of the other. Hope this helps.
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Old 11-02-2011, 05:32 PM   #5
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I would advise to do it closer to the radiator, not as cramped, and little more flex without possible damage to the in/outlets on the heater core.
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Old 11-02-2011, 05:46 PM   #6
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I had the same problem, flushed my radiator and heater core now its nice an warm
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Old 11-02-2011, 10:21 PM   #7
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Ok so I did all of that and actually did a full radiator flush while I was at it and it made zero difference. Still feels like the A/C is on. When I did the core flush I got nothing out of it as far as gunk or whatever might have been messing it up. I guess I could have done it improperly but it didn't seem like it was that difficult. Basically what I did was I got one of those flush n fill kits from Walmart and did a flush with that. Then I removed the heater hoses from the water pump and radiator and shot water through them in both directions. A few tiny bits of dirt or something came out but not much. The water flow didn't seem to be restricted or anything so I have no idea what's going on now. Both of the heater hoses get plenty hot when the engine temps are up and when I took the line off some antifreeze came out. Any other suggestions?
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Old 11-03-2011, 04:33 AM   #8
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Check your blend door to make sure it is functioning properly. I suggest an internet search on this.
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Old 11-03-2011, 01:09 PM   #9
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The blend door seems to be working fine. I was also wondering something about how the radiator drains. The plug on the bottom does not come all the way out on mine which causes coolant to shoot everywhere making a huge mess. Is that how it is supposed to be or is mine messed up?
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Old 11-03-2011, 02:54 PM   #10
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I am actually wondering if it is the blend door after all. I was reading that it is supposed to make a very distinctive thud sound when I adjust it and it definitely does not do that. I looked under the dash while I moved the slider and the cable moves but it doesn't seem to be doing anything beyond that. I will search for some fixes but can anyone recommend something as well?
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Old 11-08-2011, 12:36 PM   #11
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Alright I am really needing some help now. I back flushed the core again and there is no way that it is plugged. It flowed out both ways just fine and was nothing but clean water. My understanding is that if the heater core itself was bad then it would leak or something right? The only other thing I can figure is the blend door. On a 97 is it just a cable operated door or are there vacuum lines and stuff too? I really need to figure this out because it is getting cold out and will definitely be needing a heater here soon.
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Old 11-08-2011, 12:40 PM   #12
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You might have to flush it out a couple of times for it to work. That's what I had to do with mine. Also make sure your blend air door is moving when you switch from air to heat. The door should be pulled closest to the passenger seat not pushed away from it. You can move it with your hand if it won't move automatically
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Old 11-08-2011, 12:41 PM   #13
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You do have vacuum lines but if they were unattached your air would probably be coming out of your defrost vents.
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Old 11-08-2011, 12:47 PM   #14
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You might have to flush it out a couple of times for it to work.
If it flows freely, it flows freely.
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Old 11-08-2011, 12:57 PM   #15
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You do have vacuum lines but if they were unattached your air would probably be coming out of your defrost vents.
The vacuum lines are only for the vent selector though right? Or do they control the temps as well? If there is a cable in the 97 that controls a door then I don't think there would be vacuum lines for that too.
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Old 11-08-2011, 01:28 PM   #16
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Originally Posted by bighog85

The vacuum lines are only for the vent selector though right? Or do they control the temps as well? If there is a cable in the 97 that controls a door then I don't think there would be vacuum lines for that too.
I couldn't tell you man. I know vacuum lines do control the vent selector but don't know about the temps and all that. I have a 97 myself, and just started to get into the mechanical part of jeeps. I had a heat problem as well. I flushed out the heater core, bought a vacuum connecter, and that was that. All I know to tell you is to make sure your cable doesn't have a kink in it, and is letting your door move freely and as far as it needs. I read about a few guys having that problem when i was doing research about my heater too
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Old 11-08-2011, 02:36 PM   #17
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I have a 97 and had a case of my heater not working. Engine ran cool and took a while to warm up and heater NEVER blew warm air. Did a reverse flush and all that and still nothing. Except...

Everything in my cooling system had been replaced by me after I got the TJ. Except the water pump. I pulled it out and the impeller wouldn't turn. AT ALL. That explains the smell too.

Replaced the pump with the proper pump (Look for the "R" on the impeller to see if it is reverse flow - my 2.5L is reverse flow). Engine is now up to operating temp within 5-7 minutes and blowing hot air after that even when it is about 25 degrees outside.

Do your hoses feel hot at all when running?
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Old 11-08-2011, 03:32 PM   #18
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Both of the heater hoses get plenty hot when the engine temps are up
that alone means the odds of a bad heater core are almost nil...

there's a very good chance that it is the blend door control cable (or solenoid if it's vaccum, but you mentioned a cable, so...), but you'll have to look at the other end of the cable to see why. I'm assuming it's a cable operated because you mentioned seeing the cable operate at the control panel (vaccum is a really similar system though, just has more parts that can fail, and some have purely electrical systems with electric solenoids that get even more failure-prone). Find the other end of that cable and that's your blend door (never messed with a TJ, but there's a VERY good chance it's behind the glove box... it's almost always on the inside of the firewall at the same place the heater core connections are on the outside.). If you disconnect the cable or solenoid form the blend door, you should be able to move the connection (usually a little lever or a screw slot type deal) on the housing back and forth fairly easily by hand to verify that the blend door isn't siezed (it happens sometimes), and you will hear that telltale "thunk" sound and can verify that you have hot air. if the door isn't siezed, it should be fairly straightforward to determine why the control isn't operating no matter what type of system it is... cables get kinked, solenoids go bad (especially electric ones), housings break (because your 3 year old tossed his little green army guy in the defrost, jammed the door, and you broke something trying to force a stuck door... or something...), but if the control at the dash is working, then the blend door is almost definitely where you'll find the issue...

If the door IS siezed, then jiggle the **** out of it and try to force it (wd-40, swift kick, BFH, etc.), because un-jamming it the proper way is a right proper PITA.
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Old 11-08-2011, 06:08 PM   #19
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Do your hoses feel hot at all when running?
Ya everything gets hot so I don't think that is the issue either. When I take the hoses off to flush the core quite a bit of antifreeze runs out so it is definitely circulating.
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Old 11-14-2011, 07:57 AM   #20
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Hello guys, I am going to piggyback on this thread since I have the exact same problem with my 99. I am actually going to ask a couple of elementary questions since I have not had time to look at mine since i got it. First off where is the thermostat???I once changed the thermostat on my old pickup with no prob but want to make sure I'm looking at the right stuff. Also on the off chance mine has been removed, any recomendations on the proper temp to replace it with? it runs at about 200 to 210 now. Also, another quick question, my oil pressure guage idles at 40 then jumps to 45 when accelerating, is that normal? Ive only owned two other vehicles and neither one had the gauges ever fluctuate back and forth. Thanks in advance for any advice, i've never been one to make many repairs on a vehicle but would like to give this a shot before i take it too my local mechanic. and good luck to bighog85 i hope you have had good luck with your heating problem.
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Old 10-22-2013, 07:25 PM   #21
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Angry Heat not working???

My heat or ac is not working smelt like wires burning then it never worked again .. What could it be??? Dose not work on any settings

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