1966 Impala heater core replacement

SOURCE: replace heater core 1994 chevy g20 conversion van

Here a are the instuctions to remove it. I did not know if you have A/C or not so I included both for you.

REMOVAL & INSTALLATION
Without Air Conditioning
ALL MODELS
See Figure 1

1. Disconnect the negative battery cable.
2. Remove the coolant recovery bottle.
3. Place a pan under the van and disconnect the heater intake and outlet hoses. Quickly remove and plug the hoses and support them in an upright position. Drain the coolant from the heater core into the pan.

1. Remove the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw. Remove the duct.
2. Remove the engine cover.
3. Remove all the instrument panel attaching screws.
4. Carefully lower the steering column. Raise and support the right side of the instrument panel. Refer to for further details.
5. Remove the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
6. Disconnect the temperature door cable. Carefully fold the cable back and out of the way.
7. Remove the three nuts from the engine compartment side of the distributor case and the screw from the passenger compartment side.
8. Remove the heater case and core assembly.
9. Remove the core retaining straps and remove the core.

1. Install the core.
2. Install the core retaining straps.
3. Install the heater case and core assembly.
4. Fasten the three nuts on the engine compartment side of the distributor case and the screw on the passenger compartment side.
5. Connect the temperature door cable.
6. Install the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
7. Install the steering column.
8. Fasten all the instrument panel attaching screws.
9. Install the engine cover.
10. Install the duct. Install the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw.
11. Connect the heater intake and outlet hoses.
12. Fill the cooling system.
13. Install the coolant recovery bottle.
14. Connect the negative battery cable.

1. Disconnect the battery ground cable.
2. Remove the engine cover.
3. Remove the steering column-to-instrument panel bolts. Lower the column carefully.
4. Remove the upper and lower instrument panel attaching screws. Remove the radio support bracket screw.
5. Raise and support the right side of the instrument panel.
6. Remove the lower right instrument panel bracket.
7. Remove the vacuum actuator from the kick panel.
8. Disconnect the temperature cable and vacuum hoses at the case. Remove the heater distributor duct from over the engine hump.
9. Remove the two defroster duct-to-firewall attaching screws below the windshield.
10. Under the hood, disconnect and plug the heater hoses at the firewall.
11. Remove the three nuts and one screw (inside) holding the heater case to the firewall.
12. Remove the case from the van. Remove the gasket for access to the screws holding the case together. Remove the temperature cable support bracket. Remove the screws and separate the case. Remove the heater core.

1. Install the heater core.
2. Assemble the case and fasten the screws.
3. Install the temperature cable support bracket.
4. Position the gasket, then install the case in the van.
5. Fasten the three nuts and one screw (inside) holding the heater case to the firewall.
6. Connect and plug the heater hoses at the firewall.
7. Fasten the two defroster duct-to-firewall attaching screws below the windshield.
8. Install the heater distributor duct.
9. Connect the temperature cable and vacuum hoses at the case.
10. Install the vacuum actuator at the kick panel.
11. Install the lower right instrument panel bracket.
12. Fasten the radio support bracket screw.
13. Fasten the upper and lower instrument panel attaching screws.
14. Fasten the steering column-to-instrument panel bolts.
15. Install the engine cover.
16. Connect the battery ground cable.
17. Refill the cooling system as necessary.

SOURCE: 1988 Chevy Blazer Heater Core Replacement

first determine if the heater core is located high or low by raising the hood checking against the firewall {by following the heater hoses to the fire wall} if it is high need to remove the dash. if it is low get on your back and start removing clips and screws no special tool needed.

SOURCE: How do I remove the dash board of a 2003 Impala to replace heater

you don't have to remove the dash to do this job

Testimonial: "What a relief, now I must find out how to replace it."

Greg Bernett

• 2993 Answers
• Posted on May 28, 2010

SOURCE: How do I remove the heater core in a 1965

Here ya go! Fairly simple task!

Removal and Installation

1. Drain the radiator, remove the radiator expansion-tank retaining straps, and move it from the work area.
   
2. Remove the battery.
   
3. Remove the water hoses from the heater assembly.
   
4. Remove the seven stud nuts attaching the blower and an inlet assembly to the firewall. Remove the assembly.
   
5. Remove the glove compartment and panels on both sides of the console.
   
6. As a precaution, place a plastic sheet or other waterproof covering over the passenger-side carpet.
   
7. Remove the two control cables from the instrument panel.
   
8. Disconnect the wire leads from the lower switch and the resistor.
   
9. Carefully remove the heater assembly from under the dashboard.
   
10. Remove the four core cover retaining screws.
    
11. Loosen the four screws holding the core retaining yokes and the core to the retainer cover.
    
12. Remove the rear cover and core.
    
13. To install, reverse this procedure.
    

SOURCE: how do you replace a

How to Replace the Heater Corein a Chevy Impala

Replacing your Chevy Impala'sheater core is no easy task. There are several parts you must carefully removeor reposition to disconnect the core from the heating, ventilating and airconditioning (HVAC) module. This module and the core are located behind thecar's floor ducts.

1. Jack up the car and drain the Impala's cooling system.Loosen the water pump's drain bolt and let the coolant drain into a pan. Closethe drain bolt and lower the car afterward. 2. Remove the heater outlet and inlet hose from theheater core (reposition the hose clamps to do so). Take off the right consoleextension panel, body control module and left side extension panel on the frontfloor console 3. Disconnect the leftinstrument center support bracket (pull away the carpet at its bottom to reachthe nuts). Remove the accelerator control pedal from its position in the frontof the dash. 4. Disengage the center floorducts by raising the outlet duct while pushing the ducts down. Rotate theoutlet duct forward in the car and pull down to remove it from the HVAC module. 5. Use a small chisel to removeall the heat stakes from the heater core cover. Loosen the nut behind the fuelline bracket. Remove the dash panel's stud at the heater hoses. 6. Pull the core's cover downenough to reach the HVAC module's locating pins. Slide the cover rearward untilthe drain tube clears the dash front. Remove the cover by sliding it down,rearward, and to the right. You can now remove the core.
Installing the New Core
1. Install the new core into the HVAC module,attaching a new seal onto the drain tube. Attach the core cover from the rightside, sliding it up and forward into position. 2. Align the draintube with the front dash hole and the core cover holes with the HVAC locatingpins. Install the core cover screws, cutting and folding back the soundinsulator near the center screw to ease that screw's installation. 3. Reinstall the dash panel stud at theheater hoses, tightening the nut behind the fuel line bracket. Align the centerfloor duct with the HVAC and push it up while rotating rearward to install it.Put the floor ducts and outlet duct back into the Chevy Impala. 4. Attach theaccelerator control pedal. Pull the carpet back and position the left centersupport bracket, then tighten the bracket nuts. 5. Reconnect theleft side front floor console extension panel and the body control module tothe car. 6. Put on the outlethose and inlet hoses to the core, securing them with their clamps. Refill thecooling system with the proper mixture of water and coolant.
Read more: How to Replace the Heater Core in a Chevy Impala ' eHow.com