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Old 01-08-2009, 05:42 PM   #1
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No Heat?

So my 98 wrangler has no heat. The engine warms up just fine but no heat out of the vents. I am thinking it is the heater core, but wanted to check to see what everyone else thought

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Old 01-08-2009, 05:58 PM   #2
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Sounds like the heater core to me. Especially if the engine warms up.

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Old 01-08-2009, 06:12 PM   #3
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Yeah thats what I thought
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Old 01-08-2009, 06:15 PM   #4
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Are you getting any air at all out of the vents? Blower working?
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Old 01-08-2009, 06:21 PM   #5
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yes air movement just not heat
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Old 01-08-2009, 06:22 PM   #6
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hehe when my water pump died, my engine also warmed up and i was getting no heat in the heater. Open up the radiator cap and see, the coolant should be full almost to the rim. DO NOT JUST LOOK AT THE BOTTLE. OPEN THAT CAP UP.
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Old 01-08-2009, 06:24 PM   #7
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^^^^ Also good points. That is easier to fix than the heater core too.
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Old 01-08-2009, 06:32 PM   #8
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If you are not losing any coolant the first thing to check is the heater hoses and see if they are both equally hot.If one is hot and the other is just lope warm then you have a clogged heater core more than likely.If they are both equally hot as they should be then the problem is more than likely in your blend door(not changing over from pulling air through the A/C coil to pulling air through heater core)Most of the time due to a vacuum leak.
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Old 01-08-2009, 07:21 PM   #9
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something that i cannot find the answer to.. is coolant always flowing through the heater core or is there a valve? Some people say the only thing stopping the hot air from entering the cab is a blend door while others say there is a bypass valve system if the heater is not on so the heater core doesnt get any flow. Either way if your radiator is full then its either the valve or the door.. whatever the final answer to that question is.
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Old 01-08-2009, 07:38 PM   #10
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No the Wrangler does not have the control valve.Some do like the Ford Ranger and many others but the Wrangler does not have it,or at least mine don't.It would be on the heater hoses and have a vacuum line running to it that opens and closes a flap to divert the coolant basically like hooking both hoses to each other and by passing the heater core and when the controls are switched to heat it opens and allows the coolant flow to go through the heater core.But never the less the Wrangler does not have it.It is controlled only by the blend door.
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Old 01-08-2009, 07:50 PM   #11
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Awesome, any idea how hard it is to get to the heater core and what should i look for with the blend door? Sorry never had a wrangler before
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Old 01-08-2009, 07:57 PM   #12
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Quote:
Originally Posted by slf41002 View Post
It would be on the heater hoses and have a vacuum line running to it that opens and closes a flap to divert the coolant basically like hooking both hoses to each other and by passing the heater core and when the controls are switched to heat it opens and allows the coolant flow to go through the heater core.But never the less the Wrangler does not have it.It is controlled only by the blend door.
so that blend door either reroutes the coolant directly from one hose to the next or through the heater core? Isnt that a valve?

From what i was able to find online a blend door is a door that blocks the actual air flow from the heater core to the vents of the car but does nothing about rerouting the actual coolant flow in the heater.
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Old 01-19-2009, 08:18 PM   #13
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so it isnt the heater core. How do i check the blend door?
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Old 01-19-2009, 09:06 PM   #14
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The blend door directs air around or threw the heater core. On 99 and up with the dial for temp control it is moved with a stepper motor. It isn't controlled with vacuum. On 97 and 98 tj's with the lever for temp may be cable operated like alot of cars with that style control but I'm not 100% sure.
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Old 01-19-2009, 10:15 PM   #15
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Your heater core could be clogged, take the hoses off and blow water backwards through it with a water hose. Easy thing to do and could be a simple fix. I would do that first before I get to much into it.
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Old 01-20-2009, 10:14 AM   #16
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so that blend door either reroutes the coolant directly from one hose to the next or through the heater core? Isnt that a valve?

From what i was able to find online a blend door is a door that blocks the actual air flow from the heater core to the vents of the car but does nothing about rerouting the actual coolant flow in the heater.
No coolant flow is changed what so ever,the blend door directs the air either through the heater core or the A/C core depending on the switch position.The coolant constantly flows through the heater core whether you have heat on or not but the blend door closes off the hot air while in a/c mode or on cool and off.Most of the time anyway.That is why you have heard people complain about there feet getting hot from hot air in the floor in the summer time.That is mostly on S-10s but it is caused by the blend door not closing tightly or a vacuum problem.On the Wrangler it is usually athe cable not pulling the door closed all the way.Hence the reason most companies started using electric motors to operate the flaps and doors for the heating and air controls.

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The blend door directs air around or threw the heater core. On 99 and up with the dial for temp control it is moved with a stepper motor. It isn't controlled with vacuum. On 97 and 98 tj's with the lever for temp may be cable operated like alot of cars with that style control but I'm not 100% sure.
Yes the 97-98 is controled by a cable.
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Old 01-20-2009, 08:27 PM   #17
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Sherman, you're one smart man
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Old 01-20-2009, 10:03 PM   #18
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Just life's lessons mostly.LOL And other times I just make it sound good. But that is the way the heat works then again I contradict myself like on post #8 I said most of the time due to a vacuum problem knowing full well the Wrangler blend door is controlled by cable not vacuum but I get in a hurry from time to time.That and I work so many different vehicles it is hard to keep them straight from one to the other.
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Old 01-21-2009, 06:50 AM   #19
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So I should check the cable?
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Old 01-21-2009, 10:15 AM   #20
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I would check all possibilities and solutions before replacing a heater core.You can look at the cable just at the crest of the bottom edge of the dash just to the left of the glove box.Did you check your heater hoses like I said???Make sure they are both equally hot after the Jeep reaches full temps.If the top one is hot and the bottom just warm you need to flush out the heater core by removing the hoses and putting a water hose to the bottom nipple first and flush for a few minutes watching for sludge or foreign debris coming from the top nipple,after a few minutes then flush from the top nipple and watch for debris from the bottom nipple.Then before you put the hoses back on check them for build up on the inside of the hoses.Just to be safe if you come to this point pull both heater hoses off and clean them out at the sink.
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Old 01-22-2009, 02:21 AM   #21
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Thanks, that is alot of help
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Old 01-22-2009, 08:59 AM   #22
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Any chance of having a diagram of the stepper motor (and where located) and where the vacuum hoses are? thanks...
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Old 01-22-2009, 09:18 PM   #23
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well any time the thermostat is closed, there is coolant going through the heater core.
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Old 01-22-2009, 09:38 PM   #24
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Look under the dash (driver)kind of toward the bottom left of the radio bezel and you should find two small vacuum actuators and the motor should be on the right side(pass) around the same general area.
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Old 01-22-2009, 09:44 PM   #25
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Quote:
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well any time the thermostat is closed, there is coolant going through the heater core.
Right because there is a bypass slot in the block and the water neck allowing coolant to bypass the t-stat into the heater core.This is why I wonder how a Wrangler can get an air pocket that I have heard other talk about.Even seen a few drill a hole in the t-stat to try to stop air pockets but I really do not see how it can get one in the first place????Can anyone chime in here to explain this????Anyone????
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Old 01-22-2009, 09:47 PM   #26
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the only air pockets i've heard was people get them while draining their coolant completely but thats it.
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Old 01-22-2009, 09:55 PM   #27
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Yeah that is what I am talking about.I mean I know I have had to drill the t-stat on cavaliers and a few other cars but they didn't have the bypass like the Wrangler.The cavalier is the worst one I have even delt with as far as air pockets in the coolant system.They suck to the point I skip the small drill bits!!!
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Old 03-30-2009, 09:16 PM   #28
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Fixed it, Flushed the heater core and it works, Thanks to all. Now all i need is a front bumper
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Old 03-31-2009, 01:34 AM   #29
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That is good to hear!!!BTW if you are in the northern ky area in the near future I have a stock front bumper minus the jugs!!!!
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Old 03-31-2009, 06:45 PM   #30
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Awesome where and how much?

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