I have little to no air flow out of my vents.

Asked by Sep 22, 2015 at 05:31 PM about the 2000 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

I have little to no air flow out of my vents. I
have already checked and fixed what i
thought was the main problems. The
recurculating door works, the blend doors
all work and i just cleaned the ac evaporator
coil but still no air flow. The last thing i can
try is getting a new blower motor resistor.

6 Answers

43,855

The resistor is the most common part that goes out. You can check the blower motor by running a separate power line to it, it should run full blast when you do this.

1 out of 1 people think this is helpful.

The fan does work but very little airflow even on high. I even used a garden hose to try and flush any crud out a second time and still NO SUCCESS.

43,855

So you are saying the blower motor works from low to high? If so it would not be the resistor. There is some obstruction some where, not sure on those if there is a cabin filter or not, something to check into, a parts store could tell you unless some one here knows for sure.

1 out of 1 people think this is helpful.

No there isn't they didn't make cabin filter in jeeps from 1997 to 2009 or something like that so thats why i was spraying the AC evaporator coil because there was a lot of dirt and debris. One of the dumb moves or smart i guess on Chrysler so it breaks down quick and are forced to pay 2000 to get the AC and heater coils replaced.

The blend air doors are broken. You will still be hearing the door actuator moving but the doors are not working. There are 2 fix's on YouTube. 1 is to cut into the box going thru the glove box and the other is taking the entire dash, council, stearing wheel and the entire HVAC box out and splitting it open to replace the doors. If you do that I recommend replacing the heating core and resister and maybe even the heater motor. You can replace the heater motor from the bottom I believe but once it is all out of there you don't want to have to go back and do it again for something else. The AC evaporator is not as important as it doesn't fail like the heater core can from all the water and corrosion moving thru it. If people would change their anti freeze or use chemicals to prevent corrosion then that would not happen.

I replaced the blower motor resistor/ controller several years ago but have had very poor air flow since. Now after reading several forums, I checked the blend door problems but they appeared fine. I could find no obstructions. The fan engaged into high.After reading on jeep garage.org... of some having the blower fan running the the wrong direction I checked and sure enough my fan was turning the wrong way. I give fault to the resistor/controller being wired wrong as when it is installed the wire clips can only go together one way. I had to cut the lead wires (green and brown I think) to the blower motor and reverse the wires. The blower now turns the correct way and air flow is restored. bygeorge

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