Heater not heating on 2000 TJ...

ScriptLizard did pass the time by typing:

Air blender door isn't opening all the way. A link might have come off, the little arm that moves the door could have broke, or you have a vac leak.

Do you have auto climate control or manual.

before you do anything else, check to make sure you have water in the radiator.

Manual.

Mine did the same. Here's what I did, and what you can do. Run your jeep untill it's hot and turn on the heater. Now open the hood. See those coolent hoses that go into the firewall to your heater core? Feel them both. Are they both hot? If so, follow the advice the others gave you. If not... Turn off your Jeep, let it cool. Detach both hoses from the sides that connect to the engine. With a garden hose, blast water through one hose than the other. This is the point where mine coughed up some really, really nasty stuff. When your done with that, flush it with demineralized water (you don't want tap water in there). hook both ends of both hoses back up. Take a drive and see if you now have heat. After your Jeep cools, top off your radiator. Nick

Thanks. I''l try this out.

Nick, You're right, mostly, but it's a 2000 TJ. His heater core shouldn't be anywhere close to clogged up unless he's been putting sand in the radiator instead of water.

Check your thermostat, better yet just replace it. It's common to have one that never closes completely or otherwise loses it's calibartion. The engine and gage work fine in warm weather, you slowly lose heat as the outside temp drops.

My wife did that > Hey, everybody. First thing... Happy Holidays!