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.
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Well this is different since most questions now are about no heat. If one ac line is cold and the other is warm, I would suspect a blend door under the dash is not working. The blend doors direct air thru the heater core and the vents.
any time you do not have hot water in the hoses to the in side of the vehicle, your water has quit either due to you having only water in the system and it froze in the winter and you started it . or the propeller just broke of old age. make sure u dont have a check valve in the hoses going to the heater core in side the car. valve would be under the hood somewhere in the duration of one of the two hoses, which is the feed. this should do u good
the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation firstname.lastname@example.org