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Unread 11-11-2010, 11:47 AM   #1
albatross0929
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1999 Jeep Wrangler Heat Not Working

I am an original owner of a 1999 Jeep Wrangler manual 6 cylinder. It has about 65,000 miles on it. The heat is not working at all. The blower is working, but it is just blowing out cold air. The air conditioning has been working fine. I replaced the radiator a couple of years ago, but no major work has been done on it since (except regular maintenance). Nothing is leaking anywhere. Do I need a new heater core?

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Unread 11-11-2010, 12:37 PM   #2
Craft95ZJ
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did you check the thermostat?
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Unread 11-11-2010, 12:43 PM   #3
joes924
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The heater core is probably plugged. Soak and flush it with CLR! Only use CLR in the core to flush not the whole system!
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Unread 11-11-2010, 12:58 PM   #4
drewkjeldsen
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I had the exact same problem last year on my 2000 tj. Would just blow cool air, room temp at best with the heat on. Ended up needing the thermostat replaced. Pretty cheap part, and very easy to do yourself.
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Unread 11-11-2010, 01:00 PM   #5
IslandTJ
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Check your blend door as well...
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Unread 12-27-2010, 09:59 AM   #6
jeeper70
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99 wrangler heater not cooling

I am having the same problem. Was the thermostat bad? If so, is there a particular brand of thermostat that is better than the others?
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Unread 01-03-2011, 07:39 PM   #7
Mahanoy
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Where would you get the blend door motor and the temp switch inside cab
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Unread 01-03-2011, 08:10 PM   #8
2GPS4ME
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Nothing is leaking, but have you taken the radiator cap off and ensured the radiator is full of coolant?
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Unread 01-05-2011, 07:32 PM   #9
PJM
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Hi Folks,

I am having the same problem. Never any coolant smell or leaks on the passenger carpet.

So today I drained the radiator (I was embarrassed how little fluid was in there).....probably only about a gallon of more brown water than coolant.

I flushed it with the heater on full blast for about 15/20 minutes.....no heat. then drained it again then took out the thermostat (It almost seemed like it was dry and a rusty brown. After that I refilled the rad with 50/50 and ran it again....

Still no heat but no puddles or maple syrup smells though. I noticed while I was repackaging the old water and flushings that there was a lot of sediment in the bottom of the bucket.

Something is probably clogged any ideas where I can go from here.

BTW, how would I go about flushing the heater core with CLR?


Thanks,

Pat
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Unread 01-05-2011, 07:39 PM   #10
sduncan
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A buddy had this problem last year..I told him to disconnect the heater hoses and take a water hose and simply flush the core. He got all kinds of crap out of it flushing it both directions. Heater works like a champ now...
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Unread 01-05-2011, 08:23 PM   #11
PJM
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Alright after a couple of youtubes and threads on this great site I have a mental picture of how to flush the heater core with the hose. I am still a little confused how to keep the CLR in the core while it works its magic? I would guess that I would disconnect the hose at the rad side and not the firewall....and send it tdown the tube and let sit a while.....

Another dumb question.....should I have the heater running while flushing....or does it matter?

Pat
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Unread 01-05-2011, 08:33 PM   #12
Knuckelhead
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Quote:
Originally Posted by PJM View Post
....or does it matter?

Pat
Nope...
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Unread 10-28-2011, 05:49 AM   #13
Bilicki2007
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Does the CLR fix the problem over using radiator flush in the heater core?
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Unread 10-28-2011, 06:42 AM   #14
JBTJ
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Do NOT use CLR!!! Read the back of the bottle!!! It's not safe to use. It will eat up the aluminum in the heater core. You will do better using vinegar or the stuff made by Preston to do the cleaning. Then don’t use tap water when you refill. That causes the heater core to clog up.
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Unread 10-28-2011, 06:44 AM   #15
Bilicki2007
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I tried using Vinegar before, and it didn't seem to do the trick. Still blows cold, and bottom hose is considerably cooler than the top hose
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