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Old 10-24-2013, 07:06 AM   #1
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Is it my jeep or is the heating system just this way?

Ever since it started to get cold i noticed that my heat is never hot no matter the temperature of the motor, i can turn on my heat and for the first second and a half its warm then it turns into just air which makes the interior colder due to the already cold temperature, should i go and pay a mechanic or is it a waste of time and just the way it is?

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Old 10-24-2013, 07:11 AM   #2
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Jeeps have great heaters. Something is wrong, possibly your heater core. Do you have a leak on the passenger side floor?

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Old 10-24-2013, 07:12 AM   #3
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Something is wrong, mine gets so hot I need to turn down the temperature after 10 minutes. My guess is either the blend door is not working or the heater core is plugged. Both very common in TJ's.
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Old 10-24-2013, 07:44 AM   #4
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Get under the dash and make sure the blend door actuator is still working.
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Old 10-24-2013, 07:53 AM   #5
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Also I'd check to make sure a PO didn't take the thermostat out.
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Old 10-24-2013, 07:57 AM   #6
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Mine is the same way. A good friend of mine who is a mechanic and has worked on Jeeps all his life said that the best long term solution is to replace the heater core, pull the water pump and flush out the engine thru the cavity where the water pump mounts until all the rust is flushed out. I just ordered a new water pump, heater core, radiator hoses, heater hoses and an evaporator for my '99 Sahara. Since it is such a pita to change the heater core, while I am in there I might as well change the evaporator if there is any sign of it leaking oil. I can always return it if I don't need it. All the parts are going to cost me a little less than $200.00. Which is money well spent for a long term repair. Just back flushing the heater core will only fix the problem for a few weeks, until the rust in the engine finds it way back to the heater core. My friend tells me there is a long cavity in the engine that collects rust and the only way to completely fix the problem is to flush out that cavity which means pulling the water pump. So this is what I am doing. You could spend less just by pulling the pump, flushing and replacing the heater core.
I hope this helps!
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Old 10-24-2013, 09:02 AM   #7
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Originally Posted by jeepers29 View Post
Jeeps have great heaters. Something is wrong, possibly your heater core. Do you have a leak on the passenger side floor?
nothing is leaking onto the floor internally
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Old 10-24-2013, 09:04 AM   #8
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Originally Posted by Dubs99sahara View Post
Mine is the same way. A good friend of mine who is a mechanic and has worked on Jeeps all his life said that the best long term solution is to replace the heater core, pull the water pump and flush out the engine thru the cavity where the water pump mounts until all the rust is flushed out. I just ordered a new water pump, heater core, radiator hoses, heater hoses and an evaporator for my '99 Sahara. Since it is such a pita to change the heater core, while I am in there I might as well change the evaporator if there is any sign of it leaking oil. I can always return it if I don't need it. All the parts are going to cost me a little less than $200.00. Which is money well spent for a long term repair. Just back flushing the heater core will only fix the problem for a few weeks, until the rust in the engine finds it way back to the heater core. My friend tells me there is a long cavity in the engine that collects rust and the only way to completely fix the problem is to flush out that cavity which means pulling the water pump. So this is what I am doing. You could spend less just by pulling the pump, flushing and replacing the heater core. I hope this helps! Dubs
so is there no way to insure my heat will work long term its just gunna screw up eventually due to rust?
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Old 10-24-2013, 09:53 AM   #9
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What if after a flush and it works you put a filter on in the hose into the heater

Removal and flush of an underhood filter would not be too big an undertaking
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Old 10-24-2013, 10:13 AM   #10
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so is there no way to insure my heat will work long term its just gunna screw up eventually due to rust?
Not true at all. Going on my second winter having done absolutely nothing and my heat works great. Use the proper antifreeze mixture in your cooling system and not water and you won't get rust in the first place.
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Old 10-24-2013, 10:15 AM   #11
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Properly operating TJ heaters are like an Easy Bake oven and will run you out of the cab with the top on.

However like many vehicles due to the small passages and mounting position of the heater core they are susceptible to becoming restricted/plugged from contaminates in the cooling system. Some coolants will actually turn to slug if not properly maintained.
If you have no leaks, the engines running at proper temperature and the ac/heat blend door is properly adjusted/operating more than likely the core is restricted. Easy to repair by removing the heater hose's and forward and back flushing the core. A common home water hose is up to the task, Do Not be tempted to blow high pressure air thru the core it will rupture! I recommend flushing the entire cooling system afterwards and refilling with a quality coolant.
If you maintain your cooling system and flush/replace coolant using the proper coolant you will not have repetitive failures.
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Old 10-24-2013, 10:17 AM   #12
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Odds are very good your heater core is simply plugged from gunk in the coolant. Flushing the heater core back & forth with a garden hose normally restores it to good operating condition.
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Old 10-24-2013, 11:03 AM   #13
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Properly operating TJ heaters are like an Easy Bake oven and will run you out of the cab with the top on. However like many vehicles due to the small passages and mounting position of the heater core they are susceptible to becoming restricted/plugged from contaminates in the cooling system. Some coolants will actually turn to slug if not properly maintained. If you have no leaks, the engines running at proper temperature and the ac/heat blend door is properly adjusted/operating more than likely the core is restricted. Easy to repair by removing the heater hose's and forward and back flushing the core. A common home water hose is up to the task, Do Not be tempted to blow high pressure air thru the core it will rupture! I recommend flushing the entire cooling system afterwards and refilling with a quality coolant. If you maintain your cooling system and flush/replace coolant using the proper coolant you will not have repetitive failures.
my ac works amazing its better than any vehicle ive been in lately, if anyone can post a small tutorial or youtube video i would greatly appreciate it i have no idea what im doing with flushing it out
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Old 10-24-2013, 12:08 PM   #14
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Old 10-24-2013, 12:47 PM   #15
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Back flushing the heater core will remove the contaminants that are now plugging you heater core and it will work fine for a while. It has contaminants in the system because it has not been maintained properly. The radiator and engine have them as well. There is a large water passage that runs the length of the engine that rust collects in and the only way to completely fulh that area is to remove the eater pump and flush it with a water hose. If the complete system isn't flushed rust will begin forming again along with the rust that wasn't removed and the heater core will eventially plug again. If the system is flushed properly and then filled with a 50/50 pre mix or 100% antifreeze and distilled water the system will stay clean for a long long time.
Choose your poison!
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Old 10-24-2013, 09:55 PM   #16
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so i watched the video and it looks fairly simple, i dont need to refill anything with water or any other liquid and those hoses wont leak will they? Im worried about spilling all over the underneath of my hood or completely screwing up my heater
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Old 10-25-2013, 07:55 AM   #17
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If you back flush the heater using the kit available the heater hoses shouldn't leak. You should try to flush the radiator adn engine as best you can as well to remove as much rust as you can thatvhas been building up for so long. If you can get the entire system clean and refilled with the proper coolant and rust inhibitors you system should be fine. Remember regular maintenance is the key to keeping it working properly and keeping it from happening again.
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Old 10-25-2013, 08:11 AM   #18
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Just because it wasn't mentioned..........you did check to make sure your fluid is topped off fully and the system properly burped right? Low coolant and air in system can cause the same issues.
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Old 10-25-2013, 09:24 AM   #19
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Just because it wasn't mentioned..........you did check to make sure your fluid is topped off fully and the system properly burped right? Low coolant and air in system can cause the same issues.
if it was not topped off i wouldnt have ac right? Im checking my coolant fluid?
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Old 10-25-2013, 09:33 AM   #20
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the coolant level has nothing to do with your a/c
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Old 10-25-2013, 09:36 AM   #21
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the coolant level has nothing to do with your a/c
what fluid do i check for my heating
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Old 10-25-2013, 09:37 AM   #22
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coolant
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Old 10-25-2013, 10:37 AM   #23
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coolant
i have a decent amount of coolant its not full to the top
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Old 10-25-2013, 10:48 AM   #24
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i have a decent amount of coolant its not full to the top
Is the overflow bottle filled to the proper level? There are markings on the side of it.
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Old 10-25-2013, 10:54 AM   #25
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i have a decent amount of coolant its not full to the top
The top of what? The overflow bottle, or did you pop the cap on the radiator?

I personally think the best bet for you is to bring it to a shop you trust to have them check out and diagnose the heating system on your jeep. The fact that you don't even understand the very basics of the most basic maintenance checks for your engine's sub systems tells me that.

In the meantime, I suggest you grab the owners manual(or download it from the internet)and read it thoroughly from cover to cover as a start.
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Old 10-25-2013, 10:57 AM   #26
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The top of what? The overflow bottle, or did you pop the cap on the radiator? I personally think the best bet for you is to bring it to a shop you trust to have them check out and diagnose the heating system on your jeep. The fact that you don't even understand the very basics of the most basic maintenance checks for your engine's sub systems tells me that.
so brash...... But I do agree. Or find a buddy that knows something about vehicles to help you. It's not a hard job but you do need to understand basic fluid check.
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Old 10-25-2013, 11:01 AM   #27
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The top of what? The overflow bottle, or did you pop the cap on the radiator? I personally think the best bet for you is to bring it to a shop you trust to have them check out and diagnose the heating system on your jeep. The fact that you don't even understand the very basics of the most basic maintenance checks for your engine's sub systems tells me that. In the meantime, I suggest you grab the owners manual(or download it from the internet)and read it thoroughly from cover to cover as a start.
i would feel more comfortable taking it to someone but if i just need to follow the steps from the video i can do that
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Old 10-25-2013, 11:03 AM   #28
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so brash...... But I do agree. Or find a buddy that knows something about vehicles to help you. It's not a hard job but you do need to understand basic fluid check.
Not trying to be brash, or rude, just realistic given the lack of knowledge the OP is displaying. He has ALOT to learn. Starting with the very basic understanding of how the subsystems work, their components and the maintenance procedures required to be checked periodically. In his best interest only do I state what I have.
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Old 10-25-2013, 11:07 AM   #29
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i would feel more comfortable taking it to someone but if i just need to follow the steps from the video i can do that
Grab the owners manual, read it from cover to cover........its a good start for you.

Watching videos are good too, but right now, you have a lot to learn, like how your systems work, the components and what they do, and the basic maintenance and diagnosing procedures to make sure everything is up to snuff and working properly.

If your heat doesn't get hot, it can be a number of things, but if your antifreeze is not fully topped off and the air purged properly, it can keep your heater from blowing hot air.
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Old 10-27-2013, 03:24 PM   #30
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Back flushing the heater core will remove the contaminants that are now plugging you heater core and it will work fine for a while. It has contaminants in the system because it has not been maintained properly. The radiator and engine have them as well. There is a large water passage that runs the length of the engine that rust collects in and the only way to completely fulh that area is to remove the eater pump and flush it with a water hose. If the complete system isn't flushed rust will begin forming again along with the rust that wasn't removed and the heater core will eventially plug again. If the system is flushed properly and then filled with a 50/50 pre mix or 100% antifreeze and distilled water the system will stay clean for a long long time. Choose your poison! Dubs
thanks guys just flushed the lines clean and flushed my radiater filled it with new coolant and heat works great

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