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Old 01-09-2013, 08:47 PM   #1
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Post No heat!!

Does anyone know what causes the heater to stop working in a 98 TJ? The blower motor is working but it doesn't get very warm in the cab. How do I fix this?? Any info will be greatly appreciated. Thanks

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Old 01-09-2013, 08:48 PM   #2
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Originally Posted by BamaStanley109 View Post
Does anyone know what causes the heater to stop working in a 98 TJ? The blower motor is working but it doesn't get very warm in the cab. How do I fix this?? Any info will be greatly appreciated. Thanks
Start by flushing your heater core.

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Old 01-09-2013, 09:02 PM   #3
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flush your heater core and check the blend door operation and cable when you slide the temp control back/forth.
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Old 01-10-2013, 07:45 AM   #4
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Originally Posted by robs609 View Post
Start by flushing your heater core.
2nded. I just did this last week when my heater quit working and now I have to turn the heat down because it's getting too hot inside the car even with the outside temps around 20.
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Old 01-27-2013, 01:33 AM   #5
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Quote:
Originally Posted by BoiseTJ

2nded. I just did this last week when my heater quit working and now I have to turn the heat down because it's getting too hot inside the car even with the outside temps around 20.
Bump.. I've tried everything on the forum except a water pump..
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Old 01-27-2013, 01:57 AM   #6
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Old 01-27-2013, 10:16 AM   #7
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Originally Posted by RUBI 4 MY MRS
If the whole system is warm and shouldn't the water pump be fine?
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Old 01-27-2013, 10:21 AM   #8
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Your heater hoses should be hot not just warm.If your temp guage is reading 210 you should have almost 210 heater hose.
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Old 01-27-2013, 10:56 AM   #9
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Quote:
Originally Posted by ohioviper
Your heater hoses should be hot not just warm.If your temp guage is reading 210 you should have almost 210 heater hose.
Would not hot enough hoses indicate bad water pump? Or bad thermostat out of the box?
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Old 01-27-2013, 11:02 AM   #10
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Quote:
Originally Posted by dixau11 View Post

Would not hot enough hoses indicate bad water pump? Or bad thermostat out of the box?
try backflushing your whole cooling system. usually, when your water pump is bad your engine will start to overheat.
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Old 01-27-2013, 01:23 PM   #11
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I dont think your getting any flow to the heater core. Possible bad water pump,still plugged heater core or thermostat gasket blocking port to heater hose ? I would go buy a prestone flush kit and do a good system flush, then replace water pump and double check the thermostat and flush heater core again.
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Old 01-27-2013, 02:08 PM   #12
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Quote:
Originally Posted by ohioviper
I dont think your getting any flow to the heater core. Possible bad water pump,still plugged heater core or thermostat gasket blocking port to heater hose ? I would go buy a prestone flush kit and do a good system flush, then replace water pump and double check the thermostat and flush heater core again.
Both in and out hoses are the same temp.. And flushed it again. It's clean.. And got another thermostat
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Old 01-27-2013, 02:17 PM   #13
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If the whole system is warm and shouldn't the water pump be fine?
Did you read through the thread linked above? There are at least a couple other threads where the pump has looked like the one pictured there so it does happen & the engine apparently gets enough circulation to keep more or less normal temp but it takes more circulation to get to & through the heater core so the heater basically gets bypassed. If you read it I think that guy tested the heater flow by pulling the heater hose(s) with the engine running & had little or no circulation there. If everything inside is working as it should what else is there? Easy enough to check.
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Old 01-27-2013, 05:34 PM   #14
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Quote:
Originally Posted by RUBI 4 MY MRS

Did you read through the thread linked above? There are at least a couple other threads where the pump has looked like the one pictured there so it does happen & the engine apparently gets enough circulation to keep more or less normal temp but it takes more circulation to get to & through the heater core so the heater basically gets bypassed. If you read it I think that guy tested the heater flow by pulling the heater hose(s) with the engine running & had little or no circulation there. If everything inside is working as it should what else is there? Easy enough to check.
Mine has a new pump now, and still less than average heat
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Old 02-16-2013, 07:59 PM   #15
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Do you just flush the heater core with water or what??
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Old 02-16-2013, 08:00 PM   #16
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this should be a sticky thread
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Old 02-16-2013, 08:15 PM   #17
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I'm having the same trouble in a 2000 Sahara done everything but change water pump! Flushed system, cleaned core inside and out change thermastat, checked blend door everything is good except only warm air about 90 temp not hot only thing I can think is core is stopped up so bad flushing isn't doing any good or the pump is going bad bug I'm running right at 210!!
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Old 02-17-2013, 10:52 AM   #18
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dude I got the same issue in my 97have had no heat for 2 years, jeep doesn't over heat, new thermostat and water pum in mine. my blendor linkage broke(a plastic piece), too expensive to replace and too time consuming. this is the best solution I've found. I'm going to pick one up in a few weeks now That I'm working again. you can get them in 1-four vents, then just plumb your jeep to where u want the heat or just hook it up to the stock vents. this doesn't use your coolant to heat your jeep is all electric and you will have instant heat. 10,000BTUs.
DC Thermal 12 Volt Ducted Heater - Direct Hook-Up - 50 Amps, 600 Watts - 10,020 BTU
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Old 02-17-2013, 10:17 PM   #19
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Quote:
Originally Posted by BamaStanley109
Do you just flush the heater core with water or what??
Yes water
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Old 02-17-2013, 10:19 PM   #20
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Quote:
Originally Posted by 2000tjsaharah
I'm having the same trouble in a 2000 Sahara done everything but change water pump! Flushed system, cleaned core inside and out change thermastat, checked blend door everything is good except only warm air about 90 temp not hot only thing I can think is core is stopped up so bad flushing isn't doing any good or the pump is going bad bug I'm running right at 210!!
Same except I've replaced the water pump!
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Old 02-17-2013, 10:21 PM   #21
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Don't understand why 97's have a heat issue... I've replaced everything
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Old 02-17-2013, 10:48 PM   #22
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Question: I know the jeep sucks it's air in from the hood cowel, but is that the only place? Does it recycle air from the cabin?

If it does we could disable the outside air induction and make the heat alot better
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Old 02-17-2013, 10:59 PM   #23
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clean out from underneath your hood cowl
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Old 02-18-2013, 07:06 AM   #24
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Bump
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Old 02-18-2013, 11:20 AM   #25
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If you have a/c:

I don’t have the early slider type setup but I think if you disconnect the cable from the slider you should be able to keep the recirculation door closed. I think the door is in the recirculation position when the slider is off & in the 1st a/c position. If you disconnect it you should be able to use the slider to move the (vacuum) actuators to get heat from the vents you want. Worth a try. Go to this link to see how the controls work. The ’98 manual may have better diagrams.

Since you have tried everything else it is possible that the heater core is too corroded on the inside that even though water passes through you may not be getting much heat transfer from it. It is a real pain to replace it but might be what is needed.




See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
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Old 02-18-2013, 02:51 PM   #26
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Admin make this a sticky.. People need a place to discuss all heat issues, and find a solution.. I believe every option is discussed here.
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Old 02-20-2013, 07:59 PM   #27
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Doesn't seem to be a great design if so
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Old 02-20-2013, 08:03 PM   #28
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Originally Posted by dixau11
Doesn't seem to be a great design if so
Does the air recirculate at all? Or pull the air always from outside
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Old 02-20-2013, 09:03 PM   #29
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If I read it correctly in the FSM, if you have a/c there is a door that controls whether the air comes from outside or from within the cab (recirculated). Do you have a/c? If so the indicator on the mode slider should show a circular arrow on the 1st a/c setting which indicates recirculation. From that I'm guessing that when off (1st position) & the next one (a/c rec) would have the door closed & as you slide the slider the cable will pull the door open at the 3dr setting which will let the outside air come in & pass over the heater core or bypass it depending on the blend door position which is controlled by the temp slider.

There are good diagrams & detailed explanations in the FSM. Go to the link below to see it.

See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
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Old 02-20-2013, 09:29 PM   #30
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No AC heat only

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