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Old 01-10-2014, 09:35 PM   #1
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No Heat!! 2.5l engine, help!

Here's is an issue I've been having for some time now and it's to the point where it's really making want to get rid of the Jeep I bought. We've done everything. I changed the thermostat twice (had this issue looked at by a mechanic, said the thermostat was opening at 100 degree!) changed the water pump (it was bad), checked the hoses/all fittings and I'm still getting no heat. I'm TIRED of driving in -25 degree weather with no heat! We flushed the heater core, and radiator and whole cooling system, and burped it!
So here I am asking for your help again.

Here's what's going on. I turn the heater on and some hot heat comes out, then cools down to freezing in about 10-30 seconds depending on how cold it is out.

Both heater core hoses feel hot. When the blower is on one of the hoses is colder.


Here's the engine diagram for the engine I have. It also says there's hoses that go into and out of the intake manifold. I don't have these!?
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Here are pics of MY engine. Notice how the thermostat housing is different, and no manifold hoses. What? It matches the cooling layout of the bigger 4.0l engine. I have the 2.5l engine.
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And here's a 4.0 diagram…
My coing hose layout exactly matches this.
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Old 01-10-2014, 10:27 PM   #2
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I'm wondering if the heat/cool cable is frozen or not moving the vent lever for cool/heat enough. Here is mine and it looks the same as yours with te exception if the burp adapter you have. And the first diagram for the hoses is for carbd engines if I'm not mistaken.
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Old 01-10-2014, 11:03 PM   #3
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I'm wondering if the heat/cool cable is frozen or not moving the vent lever for cool/heat enough. Here is mine and it looks the same as yours with te exception if the burp adapter you have. And the first diagram for the hoses is for carbd engines if I'm not mistaken.
The cable that's inside the cab, but under the dash and in the heating box near the heater core? I can see that the cable moves when I shift it from cold to warm and the slide/lever mechanism moves on the passenger side of the vehicle and it seems to go all the way. I'm just baffled by this. I'll call the mechanic that looked at it and see what he thinks.
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Old 01-10-2014, 11:08 PM   #4
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I see your pics but you seem to missing the bypass hose. I have an 89 2.5 attached are the pictures. One heater hose goes to the drivers side intake rear. One other goes by the thermostat to water pump passenger side of center. Another comes from front of intake back to the block by the water pump.

They have to make a complete circuit and both heater hoses should be hot

The OE thermostat calls for a 195 degree stat.



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Old 01-10-2014, 11:16 PM   #5
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I see your two hoses but nothing to the intake. It's short circuited you to look at the intake and see why you have no heater hoses connected.

It completes the circuit plus sends hot water to intake.

Somehow the PO re routed you water flow and cut out the intake
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Old 01-10-2014, 11:20 PM   #6
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I see your pics but you seem to missing the bypass hose. I have an 89 2.5 attached are the pictures. One heater hose goes to the drivers side intake rear. One other goes by the thermostat to water pump passenger side of center. Another comes from front of intake back to the block by the water pump. They have to make a complete circuit and both heater hoses should be hot The OE thermostat calls for a 195 degree stat.
Your engine has the different thermostat housing, and the oil cap is in a different position. Do you have the fuel injected or carbureted engine? There is no place for any other hoses to connect on my engine.
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Old 01-10-2014, 11:22 PM   #7
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Originally Posted by jokerchief462 View Post
I see your pics but you seem to missing the bypass hose. I have an 89 2.5 attached are the pictures. One heater hose goes to the drivers side intake rear. One other goes by the thermostat to water pump passenger side of center. Another comes from front of intake back to the block by the water pump. They have to make a complete circuit and both heater hoses should be hot The OE thermostat calls for a 195 degree stat.
Your engine has the different thermostat housing, valve cover, and the oil cap is in a different position. Do you have the fuel injected or carbureted engine? There is no place for any other hoses to connect on my engine.

I installed the 195° thermostat.
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Old 01-10-2014, 11:26 PM   #8
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Yeah yeah look at this picture and see the two red circles of the intake water connections. I have hot water running through the intake. PO may have put in plugs to seal it up. But I have three heater hoses and one is a bypass.

See what you think I know there are some differences but this is what I have I don't have access to a 95 until later.

Red circles didn't show but you can see two water inlets at both ends of the intake.

You have a 91 so just look at the intake and see if you have some plugs in there. PO may have removed them for whatever reason.

Or wait for a picture of a 91 2.5 to show up tonight. Best I got

I agree the 195 is installed. Good so then both heater hoses should be hot. I am thinking without the complete loop through the intake you are not getting a return flow to the heater core thus no heat.
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Old 01-11-2014, 01:27 AM   #9
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I can tell that your engine has a different configuration. This looks like your alternator? I don't have this "slide" adjuster for belt tension. That slide is on my power steering pump. Name:  image-3390743068.jpg
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Old 01-11-2014, 01:06 PM   #10
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Cricket boy-not sure what year it started but they did away with the coolant going through the intake when they got ride if carbs I think. Thus why people are curious why your hoses are not going through your intake. I have a 95 and my setup is identical to yours. Just curious why you don't have heat. With mine I don't even need a cooling fan in the winter! I just turn on my heater and drive to work lol. I hope you figure it out! The only other thing that I can think of if the cable is moving and it moves the lever for the heat in the air box. That something is keeping the air from going through the heater core. You might need I take the air no out an clean it all make sure there isn't any animal nests or dirt keeping you from getting heat.
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Old 01-11-2014, 01:21 PM   #11
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Cricket boy-not sure what year it started but they did away with the coolant going through the intake when they got ride if carbs I think. Thus why people are curious why your hoses are not going through your intake. I have a 95 and my setup is identical to yours. Just curious why you don't have heat. With mine I don't even need a cooling fan in the winter! I just turn on my heater and drive to work lol. I hope you figure it out! The only other thing that I can think of if the cable is moving and it moves the lever for the heat in the air box. That something is keeping the air from going through the heater core. You might need I take the air no out an clean it all make sure there isn't any animal nests or dirt keeping you from getting heat.
I have a 1991 and I'm finding out that was one of the first years they had fuel injection in the wranglers instead of a carb, so mine follows the diagram of the 4.0l. Glad I got that cleared up.

I'll check the cables later today when it warms up a bit outside. Is it easy to remove the heater box/core assembly? I've heard it can be done with simple tools and without removing the dash and heater core.
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Old 01-11-2014, 02:49 PM   #12
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I'm not sure but with enough determination and patience I'm pretty sure it can be done. You might have to just remove the center a right dash inlays. That way the radio and glove box are not in your way.
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Old 01-12-2014, 05:31 PM   #13
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Here's a video that shows my heater assembly mechanism cables. http://youtu.be/y6cEHn1tFDY
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Old 01-12-2014, 09:56 PM   #14
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Yea everything looks fine as far as I can tell. That filter looking thin is fine that color. All that is is a straight vent from the vent inlet on top of the hood and bypasses everything else straight into the cab. Is the air flow sufficient when you turn the blower on and when driving down the road? Try driving down and turn the vent on the air should be flowing through there pretty good if your heater/vent box is not restricted at all.
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Old 01-13-2014, 04:54 PM   #15
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Yea everything looks fine as far as I can tell. That filter looking thin is fine that color. All that is is a straight vent from the vent inlet on top of the hood and bypasses everything else straight into the cab. Is the air flow sufficient when you turn the blower on and when driving down the road? Try driving down and turn the vent on the air should be flowing through there pretty good if your heater/vent box is not restricted at all.
I'll get back to you later after I try that. I did oil them with light oil and they seem to all move easier but didn't free anything that may be jammed. But I'll see if the vent does work down the highway, I can't recall if it does or not.

Another question… What is the purpose of the vent on top of the hood just in front of the windshield? Does this have anything to so with my ventilation/heating system?
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Old 01-17-2014, 10:14 AM   #16
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Try driving down and turn the vent on the air should be flowing through there pretty good if your heater/vent box is not restricted at all.
I put it to "vent" and I could feel some cold air moving into the cab when I put my arm down by the passenger floor, kind of a trickle, it was not blasting out or anything like the blower does. Also when it's on vent the blower motor doesn't run. It runs in any other setting and there is plenty of air being pushed out of my vents when the blower is running.
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Old 01-17-2014, 05:47 PM   #17
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Yes the vent in front of your windshield does work with your ventilation and heating system. It is your fresh air supply. An excellent thread on this is a sticky above and explains things much better than I can.
Also it is normal for the blower not to be running while your lever is in the vent position.
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Old 01-18-2014, 02:06 AM   #18
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Yes the vent in front of your windshield does work with your ventilation and heating system. It is your fresh air supply. An excellent thread on this is a sticky above and explains things much better than I can. Also it is normal for the blower not to be running while your lever is in the vent position.
I've been through that sticky post more than several times now and understand how it works and I'm just baffled as why it's not working! My hood vent is blocked up with ice and snow now but when it's warmer and it melts out (which happened recently) the heater still doesn't put out out adequate heat.
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Old 01-20-2014, 09:25 PM   #19
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I've been through that sticky post more than several times now and understand how it works and I'm just baffled as why it's not working! My hood vent is blocked up with ice and snow now but when it's warmer and it melts out (which happened recently) the heater still doesn't put out out adequate heat.
This has thing has baffled me, my brother, his girlfriend (a mechanic), and the mechanic that looked into it and said the thermostat was opening at only 100° and I replaced it and it has exactly the same symptoms. Next paycheck I'm just going to take it to the highest rated mechanic in town and have them go on a test drive with me so I can explain what exactly is going on and hopefully they can fix it. It's supped to be getting down to the near -30° range soon and I need heat in my daily driver! I have tried everything from checking for clogged vents to changing the water pump. I have a feeling it's something really stupid like a dead squirrel dried up and laying across the heater core. The last owner stored it outside for an unknown period of time. Ugh I hope it's something that simple. I'll keep you updated when I find out what's wrong with this thing!
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Old 02-07-2014, 12:33 PM   #20
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I got it solved. It was the heater core. Back flush didn't work. The heater core was completely shot. It was basically a solid brick filled with corrosion and and metal shavings from the water pump. The mechanic said only one of the tubes through the heater core was allowing coolant to pass which explains why the heater only worked for a few seconds max. It's fixed and wow these vehicles have good heaters! (When they work )

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