How to replace heater core on 2000 silverado 1500 ls pick-up

SOURCE: How to Replace a Heater Core

Removal & Installation

1. Disconnect the negative battery cable.
   CAUTION After disconnecting the negative battery cable, wait 2 minutes for the driver-s/passenger-s air bag system capacitor to discharge before attempting to do any work around the steering column or instrument
   
2. On diesel models, remove the passenger side battery and battery tray.
3. Remove the instrument panel by performing the following procedures:
   1. Remove the air bag control module (ACM) and bracket from the floor panel tunnel.
   2. Remove the trim from both cowl side inner panels.
   3. Remove the steering column-to-instrument panel opening cover.
   4. Remove the 2 hood latch release handle-to-instrument panel lower reinforcement screws and lower the handle to the floor.
   5. Disconnect the driver-s side air bag module wiring harness connector from the lower instrument panel reinforcement.
   6. Place the wheels in the straight-ahead position and lock the steering wheel. Remove the steering column without disassembling it.
   7. From under the driver-s side of the instrument, disconnect or remove the following items:
      
      Parking brake release handle linkage rod from the parking brake mechanism located on the left cowl side inner panel. Instrument panel wiring harness connector from the parking brake switch located on the parking brake mechanism. Three wiring harness connectors (body wiring harness, headlight, dash) from the 3 junction block connector receptacles located closest to the dash panel. Head light/dash-to-instrument panel bulkhead wiring harness connector screw and disconnect the connector. Instrument panel-to-door wiring harness connector located directly below the bulkhead wiring harness connector. Infinity sound system wiring harness connector (if equipped), located at the outboard side of the instrument panel bulkhead connector. Stop light switch electrical connector. Vacuum harness connector located near the left side of the heater/air conditioning housing.
      
   8. Under the passenger-s side of the instrument panel, disconnect the radio antenna coaxial cable connector.
   9. Loosen both sides of the instrument panel cowl side roll-down bracket screws about 1 / 2 inch (13mm).
   10. Remove the 5 upper instrument panel-to-upper dash panel screws; remove the center screw last.
   11. Roll down the instrument panel and install a temporary hook in the center hole on top of the panel. Attach the other end to the center hole in the top of the dash panel. The opening should be approximately 18 inches (46cm).
   12. Disconnect the instrument panel-to-heater/air conditioning housing assembly wiring harness connectors.
   13. Using an assistant, remove the instrument panel from the vehicle.
   
   
4. If equipped with air conditioning, perform the following procedure:
   1. Discharge and recover the air conditioning system refrigerant.
   2. Disconnect the refrigerant lines from the evaporator. Plug the openings to prevent contamination.
   3. Disconnect the refrigerant lines from the accumulator. Plug the openings to prevent contamination.
   4. Remove the accumulator.
   
   
5. Drain the cooling system into a clean container for reuse.
6. Disconnect the heater hoses from the heater core tubes.
7. Remove the PCM from the dash panel and move it aside. Do not disconnect the PCM harness connector.
8. In the engine compartment, remove the heater/air conditioning housing assembly-to-chassis nuts.
9. In the passenger-s compartment, remove the heater/air conditioning housing-to-dash panel nuts.
10. Pull the heater/air conditioning housing assembly rearward far enough to clear the studs and air conditioning drain tube holes.
11. Remove the heater/air conditioning housing assembly from the vehicle.
12. Remove the upper-to-lower heater/air conditioning housing screws and remove the upper housing.
13. Remove the heater core from the lower housing.
    
    
    Fig. View of the heater/air conditioning housing assembly
    
    
    Fig. View of the heater core
    

SOURCE: bad heater core

look undre the passenger side dash and you will see a black box. Look closely and you will see screws in it around the edges. remove all the screws then remove the cover,there is the heater core, held in by 1 screw that is kinda hard to see. next look under the hood on the passenger side firewall right in front of the dash, you will see 2 hoses with clamps on them. loosen the clamps and remove the hoses. you may want to drain the radiator first but I never do

SOURCE: 1990 Chevy Silverado 1500 How do you change Heater Core?

No it's on the passenger side in a plastic container that has to have the screws removed to get to it, there is one other place the put it depending on AC setup and that’s in the center of the consol the easiest way to find it is follow the heater line hoses from the water pump to the firewall and that is where the heater core is at but as I said normally they are incased in plastic on the passenger side inside the engine compartment.

SOURCE: 2000 Chevy Silverado 1500 The heater does not

Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..

SOURCE: How to replace a heater core in a 1994 chevy 1500

As with all vehicles it seems the first part that they build around is the heater core. It is under the dash above the floor housed in a black plastic sealed box. Sealed with goop. Locate that box and start removing everything around it that is peventing taking the cover off. Of course disconnect the heater hoses under the hood a thefirewall.

Warning it is never as easy as it sounds.