Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
After you get the inner fender panel out of the way, you may be able to just take the rear half of it loose, there are 3 nuts, 10mm on the lower right side of the firewall one is so close to the exhaust manifold that you will need to use an end wrench on it. There is also a small heat shield between 2 of the nuts that is important to reinstall. These are on the bottom toward the passenger side of the firewall close to the right side exhaust manifold at the firewall. If you get in trouble or need other information, just yell. Post here and I will see it. One hidden nut behind the blower motor resistor, in the hole under it. Good luck.
Important: Mark and use the same mounting bolt (located behind the A/C evaporator and blower module) for the heater assembly 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.
Important: Before installing the heat/vent module to the vehicle, ensure that the heat/vent module mounting studs are located in the proper positions.
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 heat/vent module mounting stud to 4.5 N·m (22 lb in).
Tighten Tighten the heat/vent module mounting studs to 4.5 N·m (22 lb in).
Tighten Tighten the heat/vent module mounting nuts to 4.5 N·m (22 lb in).
Tighten Tighten the A/C evaporator and blower module heat shield screws 2.2 N·m (19 lb in).
Tighten Tighten the heat/vent module mounting bolt to 4.5 N·m (22 lb in).
Tighten Tighten the heat/vent module mounting nut to 4.5 N·m (22 lb in).