2002 Chevrolet Blazer

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Oscar Jordan
5 years ago
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1 The blower motor will operate in any switch position, as long as the ignition switch is in the RUN position and the mode switch is in any position other than OFF. When the ignition switch is on, power from the instrument panel fuse block is delivered to the mode switch first before going to the blower motor switch. The blower motor and mode switches are located within the HVAC control assembly. Power is provided to the blower motor from either the instrument panel fuse block or underhood fuse block. Depending upon selected blower speeds, voltage is either supplied directly to the blower motor or voltage is varied by a series of in-line resistors. Power and ground are provided to the HVAC control assembly by the ignition 3 voltage circuit, ground circuits and splice pack. See appropriate test under. HVAC MODULE This applies to heater only, and air conditioned vehicles. For heater only vehicles, disregard references to air conditioning checks and procedures. Removal 1. Remove the instrument panel. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Drain the engine coolant. On vehicles with automatic climate control only, cut the outer layer of the A/C evaporator and blower module in order to access the service access cover. See Fig On vehicles with automatic climate control only, remove the service access cover mounting screws. On vehicles with automatic climate control only, remove the service access cover. See Fig. 15. On vehicles without automatic climate control, remove the blower motor resistor. CAUTION: Mark and use the same mounting bolt for the HVAC module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door. 3. Remove the HVAC module mounting bolt through the blower motor resistor or service access cover opening. On vehicles with A/C only, remove the right wheel house panel. See Fig On vehicles with A/C only, raise and support vehicle and remove the front right tire. On the Utility only, remove the A/C evaporator and blower module heat shield screws. On the Utility only, slide the A/C evaporator and blower module heat shield toward the front of the vehicle. Remove the 2 lower HVAC module mounting nuts. 5. On the Utility only, remove the A/C evaporator and blower module heat shield bracket. Remove the bottom right HVAC module mounting bolt from inside the vehicle. CAUTION: The HVAC mounting stud has a flange on the inside and cannot be removed from under the hood. Stop turning the stud after the threads are off the HVAC module. 6. On the Utility only, while an assistant inside the vehicle pulls the bottom right corner of the HVAC module approximately 1" (2.5 mm) back, remove the 2 HVAC module mounting studs. See Fig On vehicles with A/C only, lower the vehicle. On vehicles with a 2.2L engine only, remove the engine wiring harness bracket located at the rear of the intake manifold. 8. Remove the HVAC module mounting bolt located at the lower left side of the heater core to heater hose Tuesday, March 02, :41:49 4:41:52 PM Page Mitchell Repair Information Company, LLC.

2 connection. Remove the HVAC module mounting nut located at the lower right side of the heater core to heater connection. CAUTION: The HVAC mounting stud has a flange on the inside and cannot be removed from under the hood. Stop turning the stud after the threads are off the HVAC module. 9. On the Utility only, loosen the HVAC module mounting studs until the threads are free from the HVAC module. Disconnect all of the electrical connectors from the HVAC module. 10. Disconnect all of the vacuum lines from the heater assembly. Disconnect the heater hoses from the heater core. Remove the HVAC module from the vehicle. Fig. 14: Cutting Outer Layer Of Access Cover (Blazer, Sonoma & S10 Pickup) Tuesday, March 02, :41:49 PM Page Mitchell Repair Information Company, LLC.

3 Fig. 15: Removing & Installing Service Access Cover (Blazer, Sonoma & S10 Pickup) Tuesday, March 02, :41:49 PM Page Mitchell Repair Information Company, LLC.

4 Fig. 16: Removing & Installing Right Wheel House Panel (Blazer, Sonoma & S10 Pickup) Tuesday, March 02, :41:49 PM Page Mitchell Repair Information Company, LLC.

5 Fig. 17: Locating HVAC Mounting Studs (Blazer, Sonoma & S10 Pickup) Installation Before installing the HVAC module to the vehicle, ensure that the HVAC module mounting studs are located in the proper positions. 1. If replacing the HVAC module, transfer the components from the old HVAC module as necessary. Install the HVAC module to the vehicle. Connect the heater hoses to the heater core. 2. Connect all of the vacuum lines to the heater assembly. Connect all of the electrical connectors to the HVAC module. Install the bottom right HVAC module mounting bolt from inside the vehicle Tuesday, March 02, :41:49 PM Page Mitchell Repair Information Company, LLC.

6 approximately halfway into the threads. 3. On the Utility only, install the HVAC module mounting stud located at the lower right side of the heater core to heater hoses connection in the engine compartment. Tighten the HVAC module mounting stud to specification. See TORQUE SPECIFICATIONS. 4. On vehicles with A/C only, raise the vehicle. On the Utility only, install the bottom right HVAC mounting studs. Ask an assistant to pull the bottom right corner of the HVAC module back from inside the vehicle. Tighten the HVAC module mounting stud to specification. 5. On the Utility only, install the A/C evaporator and blower module heat shield bracket. Install the HVAC module mounting nuts. Tighten the HVAC module mounting nuts to specification. See TORQUE SPECIFICATIONS. On the Utility only, slide the A/C evaporator and blower module heat shield into the original position. 6. On the Utility only, install the A/C evaporator and blower module heat shield screws. Tighten the A/C evaporator and blower module heat shield screws specification. See TORQUE SPECIFICATIONS. 7. On vehicles with A/C only, install the right front tire and lower the vehicle. Install the bottom right HVAC module mounting bolt from inside the vehicle. Tighten the HVAC module mounting bolt to specification. 8. On vehicles with A/C only, install the right wheel house panel. Install the HVAC module mounting nut located at the lower right side of the heater core to heater connection. Tighten the HVAC module mounting nut to specification. See TORQUE SPECIFICATIONS. 9. Install the HVAC module mounting bolt located at the lower left side of the heater core to heater hose connection. Tighten the HVAC module mounting bolt to specification. On vehicles with the 2.2L engine only, install the engine wiring harness bracket located at the rear of the intake manifold. Use the same mounting bolt marked during removal for the HVAC module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door. 10. Install the HVAC module mounting bolt through the blower motor resistor or service access cover opening. Tighten the HVAC module mounting bolt to specification. On vehicles without automatic climate control, install the blower motor resistor. On vehicles with automatic climate control only, install the service access cover. 11. On vehicles with automatic climate control only, install the service access cover mounting screws. On vehicles with automatic climate control only, install the outer layer of the A/C evaporator and blower module. Do not use RTV. Apply the adhesive bead as straight as possible. Allow the adhesive to set for 15 minutes or until the adhesive becomes tacky. 12. Seal the cut line using black weatherstrip adhesive. Refill the engine coolant. Install the instrument panel. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. 13. Calibrate the HVAC module actuator (if necessary). To calibrate the HVAC module actuator, turn the ignition OFF. Remove the battery positive voltage circuit fuse of the HVAC control module (the module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds). Wait 60 seconds. Install the fuse. Tuesday, March 02, :41:49 PM Page Mitchell Repair Information Company, LLC.

2000 Chevrolet Blazer

2000 Chevrolet Blazer HEATER CORE Removal Procedure 1. Remove the heater/vent module. Refer to HEATER/VENT MODULE. 2. Remove the heater core access cover screws. Fig. 14: Identifying Heater Core Access Cover & Screws 3. Remove