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Unable To Obtain Temperature – A/C Heater Control Head Calibration Procedure MODELS: 2003 – 2004 (KJ) Liberty/Cherokee (All Markets) NOTE :This bulletin applies to vehicles built between November 20, 2002 (MDH 1120XX) and February 01, 2004 (0201XX). DISCUSSION: A manual calibration procedure for the a/c heater temperature control is available. This quick procedure may be of assistance to ensure that the a/c heater control head is correctly calibrated to the electric blend air door actuator. If calibration between the two components is not correct, then the customer may experience conditions where the a/c heater system may not obtain full cooling or full heating capabilities. If the blend air door actuator does not seem to be functioning properly, or the air seems to be too warm when the temperature select knob is in the full cold position, or the air seems too cool when the temperature select knob is in the full hot position, then a manual calibration of the a/c heater control head can be performed.

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1. Disconnect and isolate the negative battery cable. 2. Remove the wiper arms. 3. Remove the cowl cover. 4. Release the hood latch and open hood. 5. Disconnect the positive lock on the wiper unit wire connector. 6. Disconnect the wiper unit wire connector from the engine compartment wire harness. 7. Disconnect the windshield washer hose from coupling inside unit. 8. Disconnect the drain tubes from nipples on bottom of the wiper unit. 9. Remove nuts holding wiper unit to lower windshield fence. 10. Remove bolts holding the wiper unit to the dash panel. 11. Lift wiper unit from weld-studs on lower windshield fence. CAUTION: Do not allow wiper unit to rest on brake master cylinder reservoir, damage to brake system can result. 12. Remove wiper unit. INSTALLATION For installation, reverse the above procedure.

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Removal Procedure 1. Place window in the full up position. 2. Remove the door trim panel. Refer to Trim Panel Replacement – Side Front Door (See: Front Door Panel\Service and Repair\Front Door Panel Replacement) . 3. Remove the rear push in retainer on the water deflector. 4. Peel water deflector away from door panel far enough to access the outside door handle. Refer to Water Deflector, Check Link Replacement – Front Door (See: Front Door Panel\Service and Repair\Front Door Panel Components) . 5. Disconnect the outside door handle rod (1) by opening the retainer (2) at the door latch. 6. Remove the outside door handle cap screw access plug from the door. 7. Remove the screw securing the outside door handle cap. 8. Open the door handle slightly then remove the cap. 9. Raise the outside door handle counterbalance weight and remove the outside door handle by rocking outboard and sliding rearward. 10. Remove the gaskets.

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REMOVAL 1. Remove the engine Air Cleaner (ACL) . 2. Remove the RH front fender splash shield. 3. Remove the nuts and remove the A/C vacuum reservoir tank and bracket. 4. Disconnect the vacuum supply and outlet hoses. INSTALLATION 1. To install, reverse the removal procedure.

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1. REMOVE FR WIPER BLADE LH a. Raise the front wiper blade to the position as shown in the illustration. b. Disengage the claw and remove the front wiper blade LH from the front wiper arm LH. NOTE: Do not bend the front wiper arm with the front wiper blade LH removed, as the arm tip could damage the windshield surface. 2. REMOVE WIPER RUBBER LH a. Remove the front wiper rubber LH from the front wiper blade. b. Remove the 2 wiper rubber backing plates from the wiper rubber LH. 3. INSTALL WIPER RUBBER LH a. Install the 2 wiper rubber backing plates onto the wiper rubber LH. NOTE: Be sure to install the wiper rubber backing plates in the correct direction. b. Install the wiper rubber LH so that the head part (Larger side) of the wiper rubber faces the arm axle side. NOTE: Push the front wiper blade into the grooves of the wiper rubber to engage them completely.