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Old 10-17-2009, 12:29 AM   #1
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99 Heater not heating

Alright, it has started getting cold enough to start using the heater and it seems to take forever to get even warm but has never been HOT ... I have only had this jeep for about a month now so I dont know how long this problem has been on going. I was thinking about flushing the heater core out but I dont know where or how to do this. As this is my first Wrangler, I plan on doing a lot more hands on than with my liberty but this is going to be a start... Any help, extremely helpful Thanks!

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Old 10-17-2009, 12:36 AM   #2
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PM SENT lol

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Old 10-17-2009, 08:21 AM   #3
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i have the same exact problem! help!

same year, and same time i've had my first wrangler as well...coincidentally funny. lol
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Old 10-17-2009, 12:59 PM   #4
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I would check the vacuum line in engine compartment first as well as the lines behind the center bezel.

Possible thermostat as well
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Old 10-17-2009, 02:12 PM   #5
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Last winter, the heater in my '99 took forever to put out any heat. We put in a new thermostat over the summer (as well as a new radiator, because of over heating) and now my heater works great.
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Old 10-17-2009, 06:04 PM   #6
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i checked the lines and cleared them up and now it works great!

i saw a write up for the core and thank goodness i checked the lines first before going through all of that or worse yet, if the problem was that.
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Old 10-17-2009, 08:26 PM   #7
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That's great! I'm glad it was something fairly simple.
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Old 10-17-2009, 09:45 PM   #8
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I was to busy to do mine today ... maybe tomorrow! Grr ... need to get it done....
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Old 10-19-2009, 03:06 PM   #9
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Similar problem last winter for me. Jeep never overheated, in fact took a long time to heat up. Replaced t-stat. No change. Decided to swap the pump as I knew the radiator was good. Put in the proper water pump and did complete flush and reverse flush to clear out the heater core. My heater is blowing HOT air within 5 minutes and that is on a 25 degree day. When it is just cool (above freezing), it warms up faster.

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