Blower motor relay?

[Toyman]

Where is the relay switch for the heat/ac blower motor? It quit working on low and medium, only works on high speed and my guess its the relay, This is on a 2003 liberty, Or could something else be wrong?

[tomsjeep]

I think it's behind the glove box, similar to what is in the TJ. But I have to check... gimme 10 minutes and I'll come back with an edit (search function is gunky on PDF docs).

edit:
I'm not sure where I found this, but this may help... it's the info specifically for Libertys:

BLOWER MOTOR RESISTOR
DESCRIPTION
The blower motor resistor is mounted to the rear side of the HVAC housing on the passenger side of the vehicle.
OPERATION
The resistor is a credit card resistor that utilizes resistor circuit tracers to reduce current flow to the blower. The blower motor switch directs the ground path through the correct resistor circuit to obtain the selected speed.
The blower motor resistor cannot be repaired and, if faulty or damaged, it must be replaced.
DIAGNOSIS AND TESTING - BLOWER MOTOR RESISTOR
For circuit descriptions and diagrams, (Refer to Appropriate Wiring Information).
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative cable.
(2) Open the glove box door and reach in and unplug the wire harness connector from the blower motor resistor.
(3) Check for continuity between each of the blower motor switch input terminals of the resistor and the resistor output terminal. In each case there should be continuity. If OK, repair the wire harness circuits between the blower motor switch and the blower motor resistor or blower motor relay as required. If not OK, replace the faulty blower motor resistor.
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative cable.
(2) Open the glove box door to gain access to the blower motor resistor.
(3) Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch.
(4) Depress the latch on the blower motor resistor wire harness connector and unplug the connector from the resistor.
(5) Remove the two screws that secure the resistor to the HVAC housing.
(6) Remove the resistor from the HVAC housing.
INSTALLATION
(1) Install the new resistor in the HVAC housing.
(2) Install the two screws that secure the resistor to the HVAC housing and tighten to 2.2 N·m (20 in. lbs.).
(3) Plug in the blower motor harness connector.
(4) Push in the lock on the blower motor resistor harness connector.
(5) Close the glove box door.
(6) Connect the battery negative cable.

[williewike]

same thing happened with the wife's Libby. haven't fixed it yet. dealer says 99% sure it's the resistor. only a $20 part, $120 if they install. i'l do it myself.

[tomsjeep]

Every Jeep seems to be vulnerable to this part cooking, first sign is always one of the fan speeds disappearing. Funny thing is although the package is marked 'made in USA' the part is marked 'hecho in Mexico'.
Just buy the part and plug it in... it's really not that hard, and it's not that different across models... the biggest thing is locating it to begin with, after that you're in business.
Anything that plugs in like a lamp is something even a klutz like me can handle.

[bigblackyj]

Same thing just happened on my wife's 03 libby. Got the resistor for less than $20 on ebay and it took about 5 minutes to replace.