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Old 11-12-2013, 12:04 PM   #1
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I'm at my end, heat problem

97 with no AC
Full doors, hard top

My jeep never gets hot!

I've -

New radiator
New hoses
Flushed heater core both ways, clean..
Checked blend door
New water pump
New thermostat,
New belt


And I still have luke warm heat.. Not to hijack but any idea?

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Old 11-12-2013, 12:21 PM   #2
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What kind of thermostat and what is the temp on it? I'm guessing you got one of the "fail safe" tstats which are known for sticking open. A normal stant 195 degree Tstat is a good option.

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Old 11-12-2013, 12:37 PM   #3
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What kind of thermostat and what is the temp on it? I'm guessing you got one of the "fail safe" tstats which are known for sticking open. A normal stant 195 degree Tstat is a good option.
I got a oem 195 t stat from autozone, it's new
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Old 11-12-2013, 02:52 PM   #4
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Do you mean the engine temp never gets hot or the heater never puts out hot air?
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Old 11-12-2013, 04:06 PM   #5
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Do you mean the engine temp never gets hot or the heater never puts out hot air?
Engine temp is at peak level, but I don't get hot air like others jeeps
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Old 11-12-2013, 04:09 PM   #6
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Originally Posted by GingerTJ View Post
Engine temp is at peak level, but I don't get hot air like others jeeps
Blend door?
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Old 11-12-2013, 04:11 PM   #7
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I have seen past posts where people have had that problem and its been an air pocket in the system. Try a search and see if you can find them. I don't remember the fix but hopefully you find the posts or someone else can help
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Old 11-12-2013, 04:26 PM   #8
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Blend door?
It's working correctly
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Old 11-12-2013, 04:27 PM   #9
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I have seen past posts where people have had that problem and its been an air pocket in the system. Try a search and see if you can find them. I don't remember the fix but hopefully you find the posts or someone else can help
Couldn't find it, how would I get the air out
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Old 11-12-2013, 04:31 PM   #10
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I think it had to do with getting the front end up higher than the back and opening the cap and see if it works it's way out. Maybe turning it on defrost too? Doing this on iPhone I can try and search that post on my computer in a bit.
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Old 11-12-2013, 04:52 PM   #11
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I can post a pic of what I mean tonight but an easy way to get rid of air trapped inthe cooling system is with a vented thermostat. A small hole (which can be added with a 1/8" or 3/16" drill) on the thermostat's flange positioned at the top lets any trapped air escape into the top of the radiator.
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Old 11-12-2013, 05:11 PM   #12
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This Video may give you some insight on Air in Your System, and HOW YOU can remove that Air. The Video shows how to do it using a Water Bottle with the Bottom removed. THE BIG thing is to keep the Bottle Neck sealed in the Radiator opening. The second Video shows how it's done using a Burping Funnel designed for that purpose, and all so gives more info on Burping.
NOTE : BE SURE to turn heater Heat Control to MAX HEAT while doing this to get the Air out of Heater System.






YOU can also do a search on Google or You-Tube using "Burping cooling System" for an endless source of information on the Subject.



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Old 11-12-2013, 05:14 PM   #13
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The simple installation of a vented thermostat as mentioned above makes all of that unnecessary.
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Old 11-12-2013, 05:17 PM   #14
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IT was only meant to assist so replacing the Stat wouldn't be necessary again, is all.

AS IN AN OPTION was all.
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Old 11-12-2013, 06:08 PM   #15
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So vented the stat, thanks! I still have below average heat though. Other ideas?
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Old 11-12-2013, 06:45 PM   #16
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Mechanical fan? Could be fan blades, fan clutch. Do you have a fan shroud? I have bought water pumps and t-stats that didn't work right.
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Old 11-12-2013, 06:53 PM   #17
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Mechanical fan? Could be fan blades, fan clutch. Do you have a fan shroud? I have bought water pumps and t-stats that didn't work right.
The shroud is a little cut into, doesn't fit the fan full circle, would that cause no heat?
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Old 11-12-2013, 07:15 PM   #18
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When the jeep is hot and you have the heat on high what are the temps of the heater core feed and return hoses? The temps should be very close each other. If one temp is considerably higher than the other then the core is blocked.

Is the radiator cap the highest point in the cooling system? It should be or you can have air that will never bleed out.

I assume it is but make sure the drive belt is tight. If it's slipping the water pump might not be pumping enough fluild to the core.
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Old 11-12-2013, 07:24 PM   #19
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Remove the Cowl and check for leaves and crap obstructing airflow.
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Old 11-12-2013, 07:34 PM   #20
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A faulty or damaged fan shroud can only make the engine run hotter, not cooler.

My thought is you may have a bad vacuum actuated flapper valve motor for the HVAC system. The heater core is always hot no matter what the HVAC's temperature dial is set at, how much heat gets into the passenger compartment is controlled by a series of moving flapper ("mode") doors, one of which is cable, not vacuum controlled.

So to me, based on everything else and what happened to my '97 TJ's heater, is that the temperature control cable came off the door it controls. It is located above the passenger side foot well. IIRC, a small push-on retainer hold the cable to the lever it is attached to.

Related to the vented thermostat which has nothing to do the actual lack of heat problem, here's a pic that shows a pair of them... one factory vented, the other vented by drilling a small hole in it. The hole serves to let trapped air out of the cooling system.
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Old 11-12-2013, 07:51 PM   #21
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Originally Posted by harryhood View Post
When the jeep is hot and you have the heat on high what are the temps of the heater core feed and return hoses? The temps should be very close each other. If one temp is considerably higher than the other then the core is blocked. Is the radiator cap the highest point in the cooling system? It should be or you can have air that will never bleed out. I assume it is but make sure the drive belt is tight. If it's slipping the water pump might not be pumping enough fluild to the core.
New radiator and new tight cap.
Serp belt is tight, and I used a lazer temp guage on the hoses, they are about equal. 5-8 degrees apart,
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Old 11-12-2013, 07:52 PM   #22
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Remove the Cowl and check for leaves and crap obstructing airflow.
Cowl is off, it's getting painted. I cleaned it out with a vacume and air hose, nothing but dust
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Old 11-12-2013, 07:54 PM   #23
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A faulty or damaged fan shroud can only make the engine run hotter, not cooler. My thought is you may have a bad vacuum actuated flapper valve motor for the HVAC system. The heater core is always hot no matter what the HVAC's temperature dial is set at, how much heat gets into the passenger compartment is controlled by a series of moving flapper ("mode") doors, one of which is cable, not vacuum controlled. So to me, based on everything else and what happened to my '97 TJ's heater, is that the temperature control cable came off the door it controls. It is located above the passenger side foot well. IIRC, a small push-on retainer hold the cable to the lever it is attached to. Related to the vented thermostat which has nothing to do the actual lack of heat problem, here's a pic that shows a pair of them... one factory vented, the other vented by drilling a small hole in it. The hole serves to let trapped air out of the cooling system.
That is a issue I've had in the past, but I zip tied the cable system back into its slot. I made sure it worked the bend door open and shut also.

I may do the thermostat mod when I get a change to remove all doubt of an air bubble
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Old 11-12-2013, 08:35 PM   #24
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You stated the hoses are 5 to 8 degrees apart but you didn't say if they are hot.

If they are hot and your blend door is working as you stated then it is very possible that your core is clogged with debris on the outside (fins), how is your airflow out of the vents when your slide is on full heat.
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Old 11-12-2013, 08:50 PM   #25
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You stated the hoses are 5 to 8 degrees apart but you didn't say if they are hot. If they are hot and your blend door is working as you stated then it is very possible that your core is clogged with debris on the outside (fins), how is your airflow out of the vents when your slide is on full heat.
Good air flow, and the hoses are hot. Just warm and not hot.
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Old 11-12-2013, 09:14 PM   #26
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Good air flow, and the hoses are hot. Just warm and not hot.
Well if the hoses are just warm and your vented you may have to try flushing the core again as it sounds like all the other bases are covered.

Hoses should be as hot as your water temp, if flow thru the core is good.
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Old 11-12-2013, 09:18 PM   #27
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Well if the hoses are just warm and your vented you may have to try flushing the core again as it sounds like all the other bases are covered. Hoses should be as hot as your water temp, if flow thru the core is good.
So if possibly there is dust on the outside of my heater core, how would I go about cleaning that?
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Old 11-13-2013, 07:12 AM   #28
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So if possibly there is dust on the outside of my heater core, how would I go about cleaning that?
If you have good air flow then the core is not clogged.

Like I said if you are only getting warm water (not hot) flow at your heater hoses then you probably need to re-flush the core as the hoses should be as hot as your radiator hoses
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Old 11-14-2013, 09:06 AM   #29
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can you see the blend door open and close, my mom-in-law had the same prob. it turned out to be the door actuator. I don't know if it was electrical, pneumatic, or mechanical, but she had it replaced and all worked fine.
If there is dust obstructing your core, use an air hose and blow it off.
Try replacing the core, seeing as how your in there anyways.
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Old 11-14-2013, 09:32 AM   #30
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can you see the blend door open and close, my mom-in-law had the same prob. it turned out to be the door actuator. I don't know if it was electrical, pneumatic, or mechanical, but she had it replaced and all worked fine. If there is dust obstructing your core, use an air hose and blow it off. Try replacing the core, seeing as how your in there anyways.
I have a cable system. I think

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