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Old 11-21-2011, 08:48 AM   #31
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Originally Posted by scgeek12 View Post
actually i just found a better pic further down the FSM cooling system and it looks like the (on mine) lower hose is the inlet coming from the T-stat, and the upper hose is the outlet going to the waterpump, so might be your T-stat is stuck closed


Well this is interesting... I'm pretty sure my hose to the heater core goes into the top... I'll have to double check when I pick my jeep up from the shop...

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Old 11-21-2011, 09:23 AM   #32
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Well this is interesting... I'm pretty sure my hose to the heater core goes into the top... I'll have to double check when I pick my jeep up from the shop...
thats for a 99, not sure what year yours is but a member on here (atthetop) can supply you with an electronic copy of your year of jeeps FSM, i got mine from him/her and got one for my buddy at work who has an 04, it does say that some previous years had water pumps that turn in the opposite direction so that might be it, but im not sure since i dont have a pic of how the coolant flows on the older years

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Old 11-21-2011, 09:28 AM   #33
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thats for a 99, not sure what year yours is but a member on here (atthetop) can supply you with an electronic copy of your year of jeeps FSM, i got mine from him/her and got one for my buddy at work who has an 04, it does say that some previous years had water pumps that turn in the opposite direction so that might be it, but im not sure since i dont have a pic of how the coolant flows on the older years
Mines a 98. I alread have the service manual (from atthetop i believe). and I didn't even bother to check, I just jumped right in.
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Old 11-21-2011, 09:38 AM   #34
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i would imagine the inlet / outlet on the core would be the same no matter which way the pump spins, just on one the pump pushes the coolant through the core and on the other it pulls it through, that would be my guess anyway
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Old 11-27-2011, 07:00 AM   #35
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By the way, I just found the 4.0L coolant flow direction schematic in the 98TJ FSM... Just a little different than the 2.5L
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Old 11-27-2011, 12:47 PM   #36
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By the way, I just found the 4.0L coolant flow direction schematic in the 98TJ FSM... Just a little different than the 2.5L
you ever check the t-stat?
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Old 12-19-2011, 01:30 AM   #37
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Exclamation Heater Treater

Bear with me, I'm writing all this on my phone. But your post just gave me a second wind...

Scgeek12, first. Thank you for your post.. I have been sorting through heater post for the last 4 days and yours is detailed and intelligent questions..

Now, I'll begin with my problem, day 4 after buying a used 2000 TJ, replaced switch to get blower going, blower works not but very cool heat, day 5 I flush heater core and heat gets up to an amazing uncomfortable luke warm. Today (day 8) I added the Same flush valve you have and flushed the coolant, heat gets a little warmer but not going to melt ice and snow when winter hits. With both heater hoses hot, I have tried all what I know to do..

My only question to you is are both of your hoses exactly the same temp or the bottom one slightly cooler? Your post has me excited to back off the heat a little and see if it gets warmer tomorrow.. If it wasn't 2 a.m., I would go run the jeep now and test this...

Anyways, this gets me to my point

I read today about this Heater Treater replacement door.. They sell a steel door replacement for blender doors that are made of plastic and break.. It specifically calls out 2000 jeep wranglers about having a special flexible plastic door. According to them, the travel from the air blender motor can go today causing this door not to seal but still work.. This is what I was suspecting on mine as when I change form hot to cold I can hear about 4 small spaced clicks..

I'm a newbie here and a very basic shade tree mech. But it seems if you have this problem.. Maybe the act off backing off an 1/8 of a turn may allow the door to seal as it's not over traveled anymore? I hope this helps ya..

Oh yeah.. That's HeaterTreater.net

I probably won't buy their product but they gave me some free knowledge..
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Old 12-19-2011, 03:08 AM   #38
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Ok, so I couldn't sleep while thinking about this. So after an hour outside in the north carolina frost (34 F).. I am certain mine must be an air blender... It makes a loud clicking sound behind the glovebox when I go slowly about 5 clicks away from full hot and about 4 clicking sounds when I go from full hot to full cold quickly and vice versa.. And full cold on vent on a cold night like tonight is not much change from full hot.. I'm moving to northern Utah in a few months and can't have this lack of heat.. Oh well.. I guess the only good news today is I'm awake early for work..
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Old 12-19-2011, 06:59 AM   #39
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both of my hoses are the same temp (hot) when running, got mine to a lukewarm, but its only when im driving lol, thinking my heater has more than 1 issue now, but i honestly havent even been trying to fix it lately just sucking it up and being cold lol
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Old 11-08-2012, 09:09 PM   #40
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Originally Posted by Getinfreaky
It makes a loud clicking sound behind the glovebox when I go slowly about 5 clicks away from full hot and about 4 clicking sounds when I go from full hot to full cold quickly and vice versa..
That sounds like broken teeth on your actuator motor. That's the device that opens and closes the blend door. It's located under the dash on the passenger side. Very easy fix.

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