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Replacing heater core in a 2004 trailblazer - TrailBlazer Chevrolet Cars & Trucks

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  • Chevrolet Master
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Not sure what information you're needing? There is quite a bit invovlved in replacing this part. I have the ALLDATA information for this vehicle but would need to know in detail what you are looking for. Feel free to email me at csautomotivecars@att.net with any questions but be detailed so i can send you the right stuff. There is no charge for me helping, I just need to know what you are looking for. Have done this job many times for this exact vehicle and I hope you know what you are getting into. There are some tools you will need to get that just aren't regular everyday tools. Just giving you fair warning and Like I said write if you have questions and I will do my best to help if I can.

Posted on May 21, 2011

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  • Expert
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Start with battery disconnect, and dont hook it back up till you get EVERYTHING PLUGGED BACK IN. oh before you do the battery adjust the seats where all bolts are accessible. remove front seats. remove console. use a torx bit on the shifter, knob, tube and leather boot all come out as 1. disconnnect harness at back of console, youll be familiar with the coupler from the drivers seat. remove A pillar mouldings, remove long trim piece around defroster ducts. remove trim below steering column. remove steel knee breaker under column. rmv bolt connecting shaft to column. (inside car) disconnect big column harness with 7mm socket, discon airbag connector right next to it. remove 4 nuts and set column aside. remove trim panel around instrument cluster. remove instrument cluster. remove glove box cover.remove radio and a/c controls. NOW looking around the dash youll see a bunch of 10mm headed bolts that hold the plastic part of the dash to the steel framwork underneath it. that frame is called the I/P carrier. remove them, and dont forget to get the 2 by the passenger airbag. by now youre unplugging stuff as you go so im not gonna tell you anymore. the passenger airbag stays with the dash, so leave the bolts with the big washers alone. ok got em all? start tugging and undoing the harnesses, antennae wires, ductwork. now youll see the I/P carrier and a bunch of harness plugs hanging out everywhere! that big black box from the middle over is your quest. thats the HVAC case, and yes you need to get the freon out of there responsibly. remove metal bracket in middle frome carrier to console bracket. the console bracket needs to be unbolted to achieve this. the ebrake lever pretty much stays solid in the car the whole time. now remove the little blower motor for the back seats. right there in the middle of the car on the bottom of the case. the I/P carrier is next, big 15mm headed bolts on both ends, 4 around the column support, And a bunch of 10mm nuts holding the hvac case to the carrier. i shouldnt have to tell you to undo all the harness anchors. remove I/P carrier. there is NO studs holding case to firewall. unhook ac lines under hood, and cuss those stupid clips on the heater hoses. spray em with WD40. let em soak a minute , you can rotate the hoses somewhat, unplug 3 actuators on left side and 1 on far right, PAY CLOSE ATTENTION to how the harnesses run around the case! Remove hvac case. flip it over and remove those 5.5mm screws holding the heater core cover on. remove heater core! . OK when you get it back together, THIS IS IMPORTANT, after reconnecting battery and turning the key on, DONT TOUCH A/C controls for about 90 seconds! the system will go thru a self test mode. leave it be while it does this! by the way the book gives 10.3 hrs on this.

Posted on May 21, 2011

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jrod1125420
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SOURCE: 2004 TrailBlazer heater core

it will be under the dashboard on teh passenger side....hard to get to....

Posted on Oct 05, 2008

emissionwiz
  • 76691 Answers

SOURCE: to replace the heater core in a 2004 neon how do

U have to remove the entire dash assmbly.

Posted on Nov 20, 2009

jturcotte
  • 8531 Answers

SOURCE: dyi instructions for removal/replacement of heater

Please let me know if you have any questions, and thanks for using FixYa.

  1. Drain the engine cooling system.
  2. Remove or disconnect the following: Negative battery cable and Heater hoses from the heater core
  3. Remove the instrument panel as follows: .
    1. Set the parking brake and block the wheels.
    2. Disconnect the parking brake release cable from the parking brake lever.
    3. Unfasten the screws that retain the DLC instrument panel left side sound insulator. Feed the DLC through the hole in the sound insulator.
    4. Unfasten the right side sound insulator panel screws and remove the panel.
    5. Unfasten the screws that attach the instrument panel left side sound insulator to the knee bolster and cowl panel.
    6. Unfasten the nut that attaches the left side sound insulator to the accelerator pedal bracket.
    7. Unplug the remote control door lock receiver module electrical connector.
    8. Remove the door lock receiver module from the left side sound insulator. Remove the left side sound insulator.
    9. Unfasten the screws that attach the instrument panel center sound insulator to the knee bolster, instrument panel, heater assembly and floor duct.
    10. Remove the center sound insulator.
    11. Unfasten the screws that attach the courtesy lamp to the knee bolster.
    12. Unfasten the screws that attach the knee bolster to the instrument panel.
    13. Disconnect the lap cooler duct from the knee bolster.
    14. Unplug the lighter electrical connection and remove the knee bolster.
    15. Unfasten the steering column-to-instrument panel nuts and lower the column.
    16. Unfasten the screws that attach the instrument panel accessory trim plate to the instrument panel.
    17. Remove the trim plate and unplug all necessary electrical connection.
    18. Remove the heater and/or air conditioning control assembly.
    19. Remove the radio and the storage compartment assembly (if equipped).
    20. If necessary, remove the instrument cluster.
    21. Unfasten the left and right instrument panel pivot bolts and the panel lower support bolt.
    22. Unfasten the speaker grilles retaining screws and remove the speaker grilles.
    23. Remove the windshield defroster grille using a flat-bladed prytool. Start at one end of the grille and work your way down the grille.
    24. Unfasten the 4 instrument panel upper support screws.
    25. Tag and unplug all necessary electrical connections.
    26. Remove the instrument panel from the vehicle.
  4. Remove or disconnect the following:

    Air inlet assembly, if equipped , Vacuum hoses Heater assembly studs, from inside the engine compartment, Blower motor resistor Stud from inside the heater case assembly; the stud is located behind the blower motor resistor Heater assembly-to-chassis screws, Heater assembly from the vehicle Access cover screws and cover from the heater assembly Heater core from the heater case assembly
    jturcotte_2224.gif

    Fig. View of the heater case assembly

    jturcotte_2225.gif

    Fig. View of the heater case cover

    jturcotte_2226.gif

    Fig. View of the heater core

    jturcotte_2227.gif

    Fig. Heater core mounting

To install:
  1. Install or connect the following:

    Heater core to the heater case assembly, Access cover to the heater assembly and the cover screws, Heater assembly to the vehicle Heater assembly-to-chassis screws and torque them to 40 inch lbs. (4.5 Nm) Stud, working from inside the heater case assembly; the stud is located behind the blower motor resistor, Blower motor resistor Heater assembly studs, working inside the engine compartment, torque them to 17 inch lbs. (1.9 Nm), Vacuum hoses, Air inlet assembly, if equipped
  2. Install the instrument panel as follows:
    1. Rest the instrument panel on the lower pivot studs.
    2. Attach the electrical connections.
    3. Install but do not tighten the 4 upper instrument panel support screws.
    4. Install the left and right panel pivot bolts. Tighten the bolts to 102 inch lbs. (11.5 Nm).
    5. Install the panel lower support bolt. Tighten the bolt to 102 inch lbs. (11.5 Nm).
    6. Tighten the upper support screws to 17 inch lbs. (1.9 Nm).
    7. Install the windshield defroster grille and the speaker grilles.
    8. Install the radio and storage compartment assembly (if equipped).
    9. If removed, install the instrument cluster.
    10. Install the heater and/or air conditioning control assembly.
    11. Attach the electrical connections to the instrument panel accessory trim plate.
    12. Place the trim plate in position and install its retaining screws. Tighten the screws to 17 inch lbs. (1.9 Nm).
    13. Place the steering column into position and install its retaining nuts. Tighten the nuts to 22 ft. lbs. (30 Nm).
    14. Attach the lighter electrical connection and the lap cooler duct to the knee bolster.
    15. Place the knee bolster into position and install its retaining screws. Tighten the Torx® head screws to 80 inch lbs. (9 Nm) and the hex head screws to 17 inch lbs. (1.9 Nm).
    16. Place the courtesy lamp in position and install its screws. Tighten the screws to 17 inch lbs. (1.9 Nm).
    17. Place the instrument panel center sound insulator in position. Install the screws that attach the center sound insulator to the knee bolster, instrument panel and the floor duct. Tighten the screws to 17 inch lbs. (1.9 Nm).
    18. Install the screw that attaches the center sound insulator to the heater assembly. Tighten the screw to 13 inch lbs. (1.5 Nm).
    19. Install the remote control door lock receiver module to the instrument panel left side sound insulator.
    20. Attach the door lock receiver electrical connection.
    21. Install the nut that attaches the left side sound insulator to the accelerator pedal bracket. Tighten the nut to 35 inch lbs. (4 Nm).
    22. Install the screw that attaches the left side sound insulator to cowl panel. Tighten the screw to 13 inch lbs. (1.5 Nm).
    23. Install the screws that attach the left side sound insulator to knee bolster. Tighten the screw to 17 inch lbs. (1.9 Nm).
    24. Feed the DLC through the hole in the sound insulator, place the DLC in position and install its retaining screws. Tighten the screws to 21 inch lbs. (2.4 Nm).
    25. Install the right side sound insulator and tighten the screws
    26. Connect the parking brake release cable to the lever

  3. Install the heater hoses to the heater core.
  4. Refill the cooling system.
  5. Connect the negative battery cable.
  6. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Posted on Sep 11, 2011

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