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Unread 12-02-2004, 04:41 PM   #1
WRFD17
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Heater is warm, but not HOT

Changed the thermostat today, flushed the system last winter. But, it's still not as hot as it used to be. Any ideas ???

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Unread 12-02-2004, 04:58 PM   #2
balloo93
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What is your operating temp at on the gauge? Did you replace the Tstat with a 195 unit?
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Unread 12-02-2004, 05:29 PM   #3
Rogo98Sport
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You might have air in your cooling system.
Take your radiator cap off and run the engine. Air bubbles should come out. Don't be afraid to rev the engine a little.
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Unread 12-02-2004, 06:44 PM   #4
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Flush your heater core independently from the radiator. The majority of the time, this solves the problem. Cheap, and effective.
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Unread 12-02-2004, 07:07 PM   #5
WRFD17
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Quote:
Originally Posted by balloo93
What is your operating temp at on the gauge? Did you replace the Tstat with a 195 unit?
Yes the new and old stats are 195's. The gauge goes up to and stays @ 210 as it always has. I did burp the system after refilling what I lost when changing the stat.
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Unread 12-03-2004, 12:55 AM   #6
balloo93
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I forgot that one, cyberbackpacker might have nailed it though. Clean out the Heater core as well and see if you get more heat.

If you are getting up to 210 that would be the thing to look at, that or nake sure the heater control valve vac line is on there good and tight and not leaking. Also make sure it is opening and closing fully.
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Unread 12-03-2004, 06:20 AM   #7
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im having the same problem where the heat gets warm but not hot, i suspect its the heater core, since when i flushed my rad. was really nasty, does anyone have a link or a write up on how to flush the heater core by its self?
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Unread 12-03-2004, 07:11 AM   #8
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Yeah my heater is the same way, I'd be very interested to see this. When I dig in to this project I'll try to take time out to take some pics.
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Unread 12-03-2004, 02:29 PM   #9
cyberbackpacker
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Here is a link that describes what you need to do to just flush the core. It is nice and simple.


http://www.olypen.com/craigh/heater.htm
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Unread 12-03-2004, 04:46 PM   #10
rmousir
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it is your heater core. most likely starting to clogg. If your jeep is as old as mine just spend the $15 for a new one and be done with it.

Good luck.
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Unread 12-23-2004, 08:37 AM   #11
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OK, thanks for all the help but, still no luck, replaced the thermostat, replaced the vac line where it was compromised, the fluid is good to -25, I just flushed the heater core, let it run outside for 20 min., that didn't work. The air coming out of the defroster vents for the side windows is very cold, the front floor vents are kind of warm, the vents for rear on back of the center console are warmer than the rest. Where is the heater control valve and how do I check it ?? Pics would help. It is 10 F out today and the wife keeps taking my TJ because it's warmer, even with the soft top.
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Unread 12-23-2004, 08:42 AM   #12
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Quote:
Originally Posted by WRFD17
It is 10 F out today and the wife keeps taking my TJ because it's warmer, even with the soft top.
sorry, no help here, but that line is an instant classic!
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Unread 12-23-2004, 08:45 AM   #13
WRFD17
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Thanks.............both upper & lower hoses coming from the heater core are hot.
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