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Old 01-10-2010, 12:36 PM   #1
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Yet another heat question.

I'm having a heater problem with my 97 Sport with 6 cylinder. I put a new thermostat, flushed the radiator, flushed the heater core multiple times, replaced with all new antifreeze and it still is just warm. I'm leaning toward the blend door to see if that may be the problem. What is the best way to check the blend door? When I move the blend lever back and forth you can hear something moving, but, is it moving all the way closed or is it partially open? That is the problem "I" have. In theory the heater core is just like a radiator and just has water flowing though it. As long as it is flowing good, it should have heat that is why I'm leaning towards messing with the blend door. Any suggestions on how to check the blend door without ripping the dash apart?

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Old 01-10-2010, 03:17 PM   #2
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Well, definitely not the blender door. Crap, now what do I do?

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Old 01-10-2010, 03:21 PM   #3
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I just did this dance.

I finally had total success when I made sure the coolant system was totally burped.

The most succesful way I found to burp it was to take off the radiator cap (when the engine was cold), and park the jeep on a hill (my driveway) with the engine facing downhill and being the lowest part. I had topped off the coolant before I did this trying to trouble shoot.

I ran the jeep for about 15 minutes and then "voila" you hear the coolant bubble over and watch it burp itself out. Then fill the coolant bottle to the full line and check it again after a few cycles of driving.

If you already throughly burped the line...I'm out of ideas and am sorry!
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Old 01-10-2010, 04:25 PM   #4
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Quote:
Originally Posted by thanley View Post
I just did this dance.

I finally had total success when I made sure the coolant system was totally burped.

The most succesful way I found to burp it was to take off the radiator cap (when the engine was cold), and park the jeep on a hill (my driveway) with the engine facing downhill and being the lowest part. I had topped off the coolant before I did this trying to trouble shoot.

I ran the jeep for about 15 minutes and then "voila" you hear the coolant bubble over and watch it burp itself out. Then fill the coolant bottle to the full line and check it again after a few cycles of driving.

If you already throughly burped the line...I'm out of ideas and am sorry!
Well, I haven't tried burping the system, but, I will try anything at this point.. Thanks
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Old 01-10-2010, 05:34 PM   #5
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Flush radiator: check
Flush heater core: check check check
replace all coolant: check
replace thermostat: check
burp system: check
check temperature flap (door): check
Still lukewarm heat. I'm going to buy a thermometer tomorrow and see what temperature the heat actually is. I'm thinking about installing my 110v converter and putting a small heater in the back to help out. My fear is it will be to big of a load and it will play havoc with my electrical system. Keep giving me ideas, I'll try them if they are legit.
Thanks again,
Chuck
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Old 01-10-2010, 06:07 PM   #6
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Jimmy D Blvd

Taking the dash apart is acually easy, in the summer anyway (Mines a 98 wo AC). On the upper corners, about 1/4 of the way in, should push down, and slide back. Then on the bottom, push in the outside corners, and gently pull straight back. Then on the control unit, I think there are 2 or 4 small bolts, uremove them, then gently pull the unit out. On the top (if I remember right) is the temp control mechanism. Make sure the cable is connected, and works in and out. Also make sure the mechanism is working properly. On mine, the "inner wheel" was out of the slide. I only had max hot air. The lever would slide about 2/3 to the cool side, but actually didn't move anything on the control. Put the "inner wheel" back in the slide, a little silicone spray, and quick wipe up, and she works great now. Good luck!
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Old 01-27-2010, 10:51 PM   #7
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Ok, I have flushed the system numerous times, via taking the hoses off of engine and blowing water back and fourth threw them circulating through the heater core. The heat does work better, but, not like it should. I haven't ran CLR through the heater core, but, I'm thinking about it. Water flows through both hoses very well. Tonight I took if for a drive and as soon as I got back, I checked the antifreeze (ok) and checked the temps of the hoses coming in and out of the heater core. The upper hose was noticably hotter than the bottom one. Strange.. Reading through various other posts, that would make it seem like the core is plugged, but, water flows through the lines easily and without discoloration. I'm thinking CLR maybe higher water pressure to flush core. Any thoughts? I've only used my garden hose in garage. My heat gauge "never" hits 210. It always seems to be between 210 and the white unlabled line between 210 and 100. I'm debating an auxilary heater, but, I don't like feeling like I"m letting it beat me.

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