Remove & Install Heater Core in a 1999 Chevy S10 Blazer I have already removed the dash and every thing in which I see but there still seems to be something holding the heater core. Something is not allowing it to come out . Could you send me some diagrams and instructions for this job
1999 Chevrolet S10 Blazer 4.3 Vortec
Need a diagram to remove the heater box. Dash out. I can not get the heater box to release. I need the info on remove & install heater core for a 1999 Chevy S10 Blazer
Heater/Vent Module Replacement Removal Procedure
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).
Tighten Tighten the heater core access cover screws to 1.9 N·m (17 lb in).
Notice: Do not allow the metal coils of the blower resistor to become grounded to any metal surface. This may result in internal circuitry damage.
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.
Cut all four sides of the cover in order to remove the three attaching screws. Use a sharp utility knife in order to cut the case. Make the cuts straight and clean because you must reinstall the access cover and the access cover must be visible to the customer.
Tighten Tighten the screw to 1.9 N·m (17 lb in).
GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified