Low heat - JeepForum.com
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post #1 of 7 Old 10-22-2010, 01:37 PM Thread Starter
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2002 WJ 
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Low heat

With the weather getting colder I have noticed that the heat in my 02 WJ isn't as hot as it should be. It isn't uncomfortably cold, its just not HOT like the type of heat that will warm up your interior in the morning.

I am worried it could be the heater core, but I have no other symptoms of overheating/ coolant loss. My coolant level is fine, temp runs and idles just fine, no leaking to the interior, no smell or moisture present either.

I have the single zone heating option, no dual zone climate. I am unsure if I have the infamous bled door issue. I have never owned a vehicle that used them.

The only other very obvious sign I can think of is that I can hear water circulating when I start my Jeep. It's a noticeable sound of water or fluid coming from within the dash. I only started to hear it within the last month or so. And just to clarify I really have no "real" modifications to my Jeep. Just drive it as a realiable DD.

I think I've covered most of my basis. I'm hoping someone has any input.

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post #2 of 7 Old 10-22-2010, 01:58 PM
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I believe the blend door issue is only on models with the dual climate zones but somebody correct me if i'm wrong on that. By the sounds of it you may have air pockets somewhere. I would try bleeding your coolant system to make sure all the air is out and recheck the level. If everything is fine after doing this and you still don't have heat check yor thermostat. They're usually pretty cheap to replace.
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post #3 of 7 Old 10-22-2010, 02:01 PM Thread Starter
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I am also unsure of the blend door thing.

Forgot to mention that. T-stat is something cheap and easy I was going to replace to rule that out. When I do that I am going to drain and replace all my coolant.
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post #4 of 7 Old 10-22-2010, 03:53 PM
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You don't have the problematic blend doors. They are on Limited's only w/ the AZC. Air in the system, since you can hear it "gurgling" is a good posibility. Try bleeding it first. It's cheap.
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post #5 of 7 Old 10-22-2010, 05:03 PM
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Mine makes that noise sometimes it also leaks a little coolant from time to time and I've tracked that down to what appears to be a water pump gasket leaking and a water pump that has 193k on the clock so its now a water pump job. Anyway my heat works fine and its hot, my temp gauges runs right at 190.

When you say bad heater core what do you mean bad ? I would say a bad heater core is either leaking or plugged, junk GM cars with dexcool coolant clogged heater cores quite a bit but I dunno about Heep or what coolant they used OEM.
When you drain all your coolant disconnect the heater hoses, I think they run right up to the front of the motor and flush water through them to make sure there is flow. Judging from your sounds of the river running in the morning I'm guessing she's flowin.
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post #6 of 7 Old 10-22-2010, 08:58 PM
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I had the same problem on my 2000 WJ nd also feared a problem with the heater core. Never would get hot and even got to where I would not cut the heat on because it was blowing cool air. Ended up taking to the radiator shop. They did a flush and a reverse flush. Been fine ever since.
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post #7 of 7 Old 10-22-2010, 09:14 PM Thread Starter
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Thanks for the help guys. Got a guy here at work who does radiator work on the side so I am going to look him up and try the flush first.
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