Question about 1999 Jeep Wrangler

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Heat/air works on the lowest seeting. if i move it to the higher seetings nothing comes out

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    _-__-___-_ Feb 10, 2014

    it has fan motor resistor block, and a switch that contols it, its very simple system. the FSM covers it here, under HVAC,. see TJ here 1999 ::: http://www.jeep4x4center.com/knowledge-b...

  • _-__-___-_
    _-__-___-_ Feb 10, 2014

    http://www.jeep4x4center.com/knowledge-b...

  • _-__-___-_
    _-__-___-_ Feb 10, 2014

    page 37 read, then see schematc on page.8w-42

  • _-__-___-_
    _-__-___-_ Feb 10, 2014

    key missng words, nothing comes out, i bet the blower is screaming on high right? the fan switch is bypassed on high, so the mode motor is failing seen on page 42. or the mode control POT.. you now have 100% docs. i hand. want to do tests?

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The fan has a two speed motor, if you can hear the fan increase speed on a higher setting it is working properly and you have a switching problem in the duct system, if the fan shuts down or doesn't increase speed when you go to a higher setting you probably have a bad fan motor or relay.

Posted on Feb 10, 2014

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  • Jeep Master
  • 20,706 Answers

The heater has dampers, and the mode section is sticking
the tests are in the FSM. under HVAC
see YJ here

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

there are 3 systems used, cable, vacuum, and motors.
in cable and vacuum , you only need to look to see if the actual damper lever works.
if yours is motor, its way more difficult. look in the FSM for that test.

Posted on Feb 09, 2014

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