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Old 04-14-2011, 10:44 PM
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Justin H.'s Avatar
Join Date: Mar 2011
Location: Clio, MI
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Heat problem!?

Temp gauge reads right around 210, but both "heat" and "vent" blow cold air. Heater core issue?

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Old 04-14-2011, 10:56 PM   #2
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I have a TJ so this is kinda "here-say"--- over this past winter there were a lot of people that had heat issues, and lots of threads. I am not saying go read all the threads-but I do remember some one was having problems similar to yours on a YJ and it was suggested the mixer door? I believe if I remember correctly yours is cable activated.

Should be able to feel heater core hoses in the engine bay and know if your core is clogged. Good Luck.

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Old 04-14-2011, 11:03 PM   #3
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Location: Loveland, CO
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Vent will never blow warm air. It could be something as simple as the cable for Cool/Hot not moving the actual diverter door

Luckily that one is easy to check. look under the dash to the right of the stereo on the big black plastic tube. There will be a couple lever assemblies. when you move the cool/hot lever you should see the mechanism of the further one move. the closer one will move when you change from Heat to Defrost.

You can also move the assembly lever by hand and you should see the levers on the comfort controls move on the dash. If nothing moves together you have a bad cable or cable hold down.

You should be able to switch the Assembly levers under the dash to the Heat position and see if you can feel anything come out when the engine is warmed up.

If no heat still comes out, check your fluid levels, make sure no one bypassed the heater core at the engine. Then I would start looking at the heater core. (Because it is the hardest of all the above to fix save it for the last part of your troubleshooting)

If someone did bypass the heater core, there is a possibility it is bad and they didn't feel like, or couldn't afford, fixing it. So if you undo the bypass don't be surprised if it starts leaking in your cabin.
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