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Old 02-17-2012, 06:55 AM   #1
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Heater blowing cool air

My 93 YJ heater has quit blowing hot air. I just replaced the radiator, water pump and thermostat. The previous owners had never changed the coolant and it was the color of chocolat milk from rust and crud. The heater was not blowing hot air just before the change and still does not after replacing it all. The hoses in and out are all hot under the hood. Is it possible that the core is clogged. It was not a gradual drop it happened in like two days when it quit. My co driver/wife was quick to notice as it was 19 or 20 degrees.

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Old 02-17-2012, 07:14 AM   #2
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heater core is probly clogged.this happend to me. take off the hoses that go in the firewall that go to the heater core and stick a water hose on the top tube.that shound free it up unless its bad.or maybe you are low on antifreeze

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Old 02-17-2012, 11:38 AM   #3
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Thanks for the info.. Mine is doing the same thing!!
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Old 02-17-2012, 12:17 PM   #4
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Stick a high pressure water hose line into the intake for the heater core, and try to flush it out that way. About equal water pressure should be coming out of the other line. If that doesn't work then get a bottle of 10 min radiator flush and flush it all out.
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Old 02-17-2012, 12:24 PM   #5
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Did you mix Orange and Green Radiator fluids?As I understand they are not to be mixed, because they cause some sort of buildup, (and the heater core is a great place for that to happen).
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Old 02-17-2012, 12:28 PM   #6
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Dexcool should NEVER be mixed with Green Coolant. The two chemicals create a thick gel substance when mixed together, which pretty much ruins your entire cooling system- would be cheaper to replace EVERYTHING (engine, radiator, heater core, etc.) than it would be to try and clean it out.
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Old 02-17-2012, 08:10 PM   #7
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Dexcool should NEVER be mixed with Green Coolant. The two chemicals create a thick gel substance when mixed together, which pretty much ruins your entire cooling system- would be cheaper to replace EVERYTHING (engine, radiator, heater core, etc.) than it would be to try and clean it out.
Brand new everything already except for the heater core. It just quit blowing hot air on the last trip to the river.
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Old 02-17-2012, 08:20 PM   #8
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heater hose

If the heater core is blocked, the return hose will be quite cool. If both are hot, then the water is flowing through the core and the air is not.

If both hoses are hot then check the box under the dash for proper air control.
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Old 02-17-2012, 08:45 PM   #9
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Make sure that the cable is still attached to the flapper under the dash. Mine popped off of the flapper arm that controls the damper across the heater core.
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Old 02-18-2012, 09:51 AM   #10
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Make sure that the cable is still attached to the flapper under the dash. Mine popped off of the flapper arm that controls the damper across the heater core.
Thanks that is looking like the probable culprit . I was running some wires up under there just before this started I may have knocked something loose there.
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Old 02-20-2012, 07:43 PM   #11
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I was starting to take apart the whole dash when I noticed the lever under the glove box. I reattached the clip into the bracket then throwed a zip tie around that and I was back to toasty hot air blowing.
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Old 02-20-2012, 09:10 PM   #12
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I was starting to take apart the whole dash when I noticed the lever under the glove box. I reattached the clip into the bracket then throwed a zip tie around that and I was back to toasty hot air blowing.
Some times it is the simple things!
Next problem you will probably have to rip the dash out! LOL...Thats the way it goes with these Jeeps.
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Old 02-20-2012, 10:20 PM   #13
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EXACT same problem except I get hot air when I hit this TINY LITTLE spot on horizontal slide. If I don't hit that 1mm threshold the whole slider pumps freezing air. Wonder if my problem is the clip, too.
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Old 02-20-2012, 11:18 PM   #14
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Sounds like mine, if it's on it's on high heat.

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