Question about 1998 Jeep Wrangler

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98 jeep wrangler no heat

My 98 jeep wranglers heater will not work. all it does is blow cold air even after the engine heates up. what do i do?

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  • sssssssss637 Nov 02, 2008

    in excess of $600.00 at the garage for a new heater core and it still blows cold.

  • kangastyle Nov 11, 2008

    I am also having the same issue. I've replaced the radiator due to to it rusting out as they all do on the Jeeps. I then replaced the thermostat. Next I flushed the heater core from the hoses in the engine compartment and it seemd to flow well. The temp is cool but not freezing. It used to kick out HOT. If I turn it to ac and then back to hot there is a slight moment when it is hot but then it resorts back to luke warm. Any ideas???

  • CCMickeyD Nov 21, 2008

    In my 1999 TJ, there is virtually no defrost heat but it gets a little better if I switch to vents and a little better still if I switch to the floor vents. It used to get almost TOO hot??? I am pretty sure it isn't the heater core or we'd all have coolent on the passenger side carpet or worse. I am going to try to blow out my core but it sounds like someone else tried that and had no luck.

  • kandieoutlaw Dec 26, 2008

    I have done all of this and noticed that my AC compressor is still running, How do I correct this problem so that the AC is off when the heat mode is on? I have replaced the compressor a few years ago, and it still runs when on heat. I know that it is suppose to cycle to keep the seals oiled, but not stay on when in heat.

  • Anonymous Dec 31, 2008

    same problem, new thermostat, radiator, flushed heater core and was not very dirty, still no heat?????????????what else can i do?

  • Anonymous Mar 26, 2014

    Jeep wrangler air will not blow in any setting. It has done this before in come and go fashion but now I'm getting nothing at all in any setting. Thanks.

  • Anonymous Mar 30, 2014

    Engine knocking skipping and no heat



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Try this disconnect the heater hoses from the heater core use a hose to backflush the core. Then reconnect and try again.

Posted on Oct 18, 2008

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Had the same problem with my 98 Wrangler. I flushed the heater core several times with no results. Air coming from the heater is warm but not hot like it should be. So I removed the heater hoses and filled the core with PB Blaster, let it soak for 2 hours and then blew it into a gallon jug with 40 PSI of air pressure. I filtered the fluid thru a rag and then poured the liquid back into the core and blew it out in reverse a couple of times. A lot of rust and junk came out in the gallon jug. It was easy to tell when the core was clear because the hoses stopped expanding when I applied the air pressure. I put it back together and now the heat is very hot, like it was when it was new.

Posted on Mar 04, 2015


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