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Unread 11-07-2013, 08:34 AM   #1
motoxracer801
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No heater! exhausted my options.

Hey everyone. I got a few questions about TJ heaters. I just don't understand what could be the issue. I've googled forums and done most of what I've been told to do. I have a 02 wrangler with the I-6. The heater only blew luke warm. I wasn't worried because it was summer time. Instead of being proactive and fixing it. I am now freezing every morning. So here's the run down. It was blowing luke warm. Warm enough to get the cabin comfortable with a hoodie on during 50ish degree weather. Well my engine was having trouble warming up. It threw a "engine staying cold to long" code. I replaced the thermostat and now it heats right up and the code cleared itself. Now I have no heater at all. The thermostat is in the right way. I back flushed the heater core and burped the system.

This is what is striking me as odd. When I remove the small cap on the line going to the heater core there is PLENTY of water movement. It will spray out of the cap. However, on the radiator. There is no movement. The jeep can be at 210 and I can open the radiator cap. The fluid is hardly noticably moving. Either way, the heater core bypasses the thermostat. So even if its a dud and not opening the heater should still work. The jeep never over heats. The heater core lines both have pressure and get hot. I'm out of ideas. Anyone know a possible fix or maybe a decent 12v heater I can buy? Thanks for the help.

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Unread 11-07-2013, 09:16 AM   #2
GSP
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remove both core lines at the engine, pressure flow water both directions, fill the core with CLR for 4-5 hours or overnight and flush both directions
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Unread 11-07-2013, 09:35 AM   #3
redclayTeeJay
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I had a weak heater core, both lines were hot, and it blew luke warm air also. I flushed it out and nothing happened. But I recently flushed it, put some simple green in the core for a few minutes, and then blew it would with compressed air. It puked BIG TIME all over me and the front of the jeep. Nasty brown stuff... I did that process about 2-3 times, and then flushed it out with the hose for 5 mins. Now it works great. Don't forget to use the hose, and air compressor blowing both ways.
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Unread 11-07-2013, 05:05 PM   #4
motoxracer801
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When I flushed mine. A bunch of Brown water gushed out. The water flow both directions was good. When I hooked it back up both lines had water in them. They were both hot. The main line had great pressure but the second one I'm unsure. So I'm thinking water is in fact moving through the heater core. Could it be the blend door? Is it possble that 90 percent of the core is plugged but allowing water to still move quickly through it? Wouldn't I have some heat? This morning I had none at all. Started cold and 30mins later shut it off blowing cold. This coulnt be a huge problem. There isn't much to a heater system..... is there?
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Unread 11-07-2013, 07:48 PM   #5
JStMarie
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Sounds more like there is something wrong with the flaps directing the air. If you have good flow through the core and the coolant is full (when it's low you get squat for flow through the core) then it's not likely the core itself. I've seen some posts here where someone found one of the directors not actuating so all or mostly cold air was being blown into the cab.
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Unread 11-07-2013, 08:39 PM   #6
chris142
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If both heater hoses are hot then you have a blend door problem. If ones hot and the other cold the core is still plugged up.
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Unread 11-08-2013, 12:41 PM   #7
motoxracer801
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Okay, bought som CLR and let it soak for a couple hours. Didn t work. Now I appear to have a leak in my radiator though. Where is the blend door located.
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Unread 11-08-2013, 12:52 PM   #8
Coyoteon2
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Quote:
Originally Posted by motoxracer801 View Post
Where is the blend door located.

Passenger side, under Dash, next to Transmission Hump → Center of Cabin.
You'll see the Actuators, watch them for movement while operating the HEAT Control.

Last edited by Coyoteon2; 11-08-2013 at 01:08 PM..
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Unread 11-08-2013, 12:57 PM   #9
Coyoteon2
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May Help ya out.

Passenger side next to Transmission Hump under Dash



IF YOU NEED TO REPLACE the Actuator, any Parts supply should have it for around $35.00. AND THE part you would need
would be → DORMAN Part # 604020

Last edited by Coyoteon2; 11-08-2013 at 01:08 PM..
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Unread 11-09-2013, 07:33 AM   #10
motoxracer801
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I haven't had the chance to actually check the actuator yet. I just wanted to run this by yall. Ocassionally when I am driving and I round a corner. Or sometkmes when I crank the a/c up. I will hear a "fumbling" noise. It sounds like broken plastic bouncing around inside the vent. It sounds like its on the far left, driver side vent. That particular vent doesn't have its directional airflow adjusters in it. They broke out. I always assumed that it was probably one of those down in the vent. Well my real question hear is. How do I know that the door its self isn't actually broken. In other words the actuator moves but the door inside is snapped. How can I tell if that's the case? Thanks
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Unread 11-15-2013, 07:51 AM   #11
motoxracer801
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Okay, had the chance to mess with it. The blend door is working. What I did notice is that the cap on the Inlet side to the heater core can be removed while the engine is up to temp. No coolant comes out anymore. I also noticed at rhe beginni g of the hose its hot. Towards the heater core its hot but not as hot. Could this be a bad water pump? If the pump is bad why isn't the jeep overheating?
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Unread 11-15-2013, 08:24 AM   #12
chris142
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Sometimes convection will move the coolant enough to keep it cool. The model t ford did not have a water pump. Sounds like you. Need to pull the pump
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Unread 11-15-2013, 08:26 AM   #13
JStMarie
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Are you certain it was the inlet side? I believe the inlet side is the side that comes from the thermostat housing, what I call the upper heater core hose as it is above the lower, outlet side that returns to the engine.

If it was truly the inlet side then that is, well, something . You should be overheating because I believe this means either you aren't pumping water or your thermostat is not opening. I don't think it would be something as simple as low coolant level.

If it was the outlet side then your core is blocked, not allowing flow.
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Unread 11-15-2013, 11:40 AM   #14
motoxracer801
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Its definetly the upper heater core line. I can remove the little cap on it. At first coolant will over flow for like a split second. After that the coolant is just sitting. This is with the motor running and at 210. Also the upper radiator hose on the passenger side has no fluid in it. No movement in the radiator. Nothing. The jeep isn't over heating at all though. I drive it daily.
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Unread 11-15-2013, 12:22 PM   #15
JStMarie
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Well slap grandma in the face I wouldn't think it was possible.

I'm flabbergasted you aren't overheating while driving. Sitting still maybe I can see, but driving down the highway with no coolant flow and sitting at 210 is too much for this brain to handle.

Well, there's yer problem.
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