Question about Jeep Grand Cherokee

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Air doesn't come out of defrost vents only the floor and regular vents

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Sounds like a blower motor resistor, how about a year , model and motor size and i can help you better

Posted on May 22, 2011

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If you are referring to the air won't blow through the defrost vents or on the floor, you may have a stuck or broken blend door actuator. This part diverts air through the different settings: defrost, vent, floor etc. If you aren't getting warm or hot air regardless of the settings, you may either be low on coolant or have a bad thermostat.

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{: ) You didn't mention which vehicle model you have, but anyway, check and make sure your control setting is not on defog or defrost. When the HVAC system detects a fault or inconsistencies in the actuator feedback circuits, the HVAC module will default the position of the mode actuator to the floor vents. Usually the fault is caused by the mode actuator itself, or it could be that the actuator doors are blocked or binding, and wiring or terminal connections come next on the list.
If it is an actuator door issue, the HVAC Blower Module should be removed and disassembled. And this also means removing the whole instrument panel which is a big job. I just hope your case doesn't go this far.
For the meantime, what you can try is to recalibrate the actuators. Turn a/c and ignition off. Turn ignition on and wait forty seconds ( don't move any HVAC controls during this period). Afterwards, you may start the engine and check operation. If not successful, a scan tool is the next option, to retrieve any codes set, and to perform actuator recalibration.

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where does the air flow, is it at the defrost vents only?

Jan 05, 2010 | 2003 Ford F150 Regular Cab

1 Answer

Air only blows on floor with very little coming out the defrost or regular vents.


Hope you have the same set up, sure you do. You may have either crossed your vaccum lines or when you were putting your heater/ac box back together or you may of pinched the vents somewhat closed. Cycle through the different zones to ensure the vents are moving as your are selecting (defrost, floor, ect...) If you think the vaccum lines are correct then you may have a reassembly issue with the Heater/ac box. I had the same problem with my 2000 Dodge Ram 4x4. Use the KISS rule "keep it simple stupid" start with the vaccum lines and all your wiring to the motors, make sure everything is plugged in. Hopefully you'll find it there before going back into the box again.

Apr 28, 2009 | 2000 Dodge Ram 1500 Truck

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