Question about 1999 Jeep Wrangler

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HVAC controls do not work

Originally the control for which vents the heat and a/c would blow would periodically not function, then they only blew out of the dash vents at full blast, now they do not blow at all.

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  • John Clark
    John Clark Mar 18, 2009

    I took mine apart and the switch was melted. I bought a new switch and it melted too. I believe there is a short or something in the wiring I have to find it yet.



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I would check the switch, but as jrc3 said, something has caused it. I would track the entire wire harness from switch to motor and replace all. There is a short some where and it will eventually burnout your fan motor also.


Posted on May 03, 2009


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same answer on all cars. nice photo, so rare here, shocking that.
in order,......
1: sure the blower must blow.
2: the engine must get to min. 180F , if not, thermostat bad in engine.
3: ok, engine is hot, so the heater core must get hot next. it has 2 hoses, we feel them with hands, are both hot?, yes, then the core is most-likely hot. (inside) (if not core is packed in gunk inside)
ever do 2year cooling flushes< (oops. zero service lands you here)
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all answers assumes , cooling system full to top of RAD.
your car uses 3 damper motors. (electric)
that operate them by controls
the motor for temp is called temperature actuator motor.
the controller is called HVAC controller
did you scan the PLC to see if HVAC controller has errors.
the controller needs fuse 15 good. Cab fuse box ."hvac-rfa"
the controller use a network, data comm .
if you scan the PCM and it tells you the HVac comms are dead
what do you know? (means you cant fix it)
its not just a simple switch like in 1990 (gone)
its all computer controlled now.

check fuse first
scan 2nd.
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