Question about 1997 Jeep Grand Cherokee

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97 Jeep Grand Cherokee only blows heat and ac out of dashboard

My 97 Jeep Grand Cherokee only blows heat and ac out of the dashboard.
Any idea how to fix this?

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  • 5 more comments 
  • m_stirling May 20, 2009

    Checked all the vacuum lines but it didn't fix the problem. Any other ideas? It is blowing from the top of the dashboard with nothing from the vents or floor.

  • Keith Heavilin
    Keith Heavilin May 11, 2010

    Do you mean that it won't blow to the floor and on the windshield?  If so I can tell you how to fix that.

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There is a vacuum leak under the hood. If it's a 6 cylinder, look on the drivers side for a vacuum line that runs vertical with a 90 degree angle fitting to the manifold. That one usually comes off. If it is a V8 look on the battery side for a broken or corroded vacuum line.

Posted on May 18, 2009

  • chryslerguy May 20, 2009

    The system is designed to switch to the defrost vents if a vacuum leak occurs, so you can see out the windshield. The line for the system comes out of the firewall beside the evaporator tubes and has a nipple on it. Remove the nippled line from the source line and see if you have vacuum at the source line with the engine running. One end of the source goes to the intake manifold, the other to the vacuum reservoir. If you have cruise control it will also branch off to feed the servo along the way. The line is also hard plastic along some of it's route and has been known to perforate due to heat and age. I would look again before paying someone. I hope this helps.



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