Question about 1998 Jeep Grand Cherokee

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When I turn on my fan for heat or air, the air only comes out of the dashboard vents (where it would go to defrost the windshield). It will not blow out of the air vents located near the driver and passenger windows OR out of the center vents in the dashboard above the stereo. Anyone know what's up with that?

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  • 83 Answers

Sounds like a stuck air blend door or a vacuum line on the heater/ac control has come loose.

Posted on Mar 10, 2011

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1 Answer

My windows are not defrosting properly.


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wow...here it is spring and no one answered either of you? Is there a large volume of air when fan is on high? Where is it going? Or do you not hear anything from the fan? The 240 has an awesome heater. On high it would heat a small home! If no sound, your blower motor is dead assuming the fuse is good. If you hear the fan blowing, figure out where the air IS going. Note that the only way to turn the dash vents off is with the white Oreo dials. To defrost, only that button should be pressed in and dash vents off. Behind the dash switches there is a maze of short vacuum hoses. Often times, people monkey w/ these and reconnect them incorrectly. Haynes manual or Chilton's have proper diagrams. It could be that the vacuum hose coming from the manifold and entering the firewall is split on the under side and not visible, also.

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