Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Ok, Here is what you are going to need to do to gain access to the heater core.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Caution: This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions:
Important: With the SIR Fuse removed and the ignition switch in the ON position, The AIR BAG warning lamp illuminates. This is normal operation, and does not indicate an SIR system malfunction.
Important: Label all of the connections in order to avoid improper installation.
Important: Mark and use the same mounting bolt for the heater/vent module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door.
Important: The heat/vent 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 heat/vent module.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the heater core access cover screws to 1.9 N·m (17 lb in).
Important: Before installing the HVAC module to the vehicle, ensure that the HVAC module mounting studs are located in the proper positions.
Tighten Tighten the HVAC module mounting stud to 4.5 N·m (40 lb in).
Tighten Tighten the heat/vent module mounting studs to 4.5 N·m (40 lb in).
Tighten Tighten the HVAC module mounting nuts to 4.5 N·m (40 lb in).
Tighten Tighten the A/C evaporator and blower module heat shield screws 2.2 N·m (19 lb in).
Tighten Tighten the HVAC module mounting bolt to 4.5 N·m (40 lb in).
Tighten Tighten the HVAC module mounting nut to 4.5 N·m (40 lb in).
Important: 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.
Tighten Tighten the screws to 1.9 N·m (17 lb in).
Important: 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.