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Instuctions for removing heater core - 2000 Oldsmobile Alero

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  • Disconnect the negative cable from the Oldsmobile Alero's battery. While the car is securely raised on jack stands, drain the engine coolant into a clean container. Most models don't have a drain plug on the bottom of the radiator, so you must take off the lower radiator hose to drain the system.
  • Step 2 Remove the drain tube from the heater's housing and disconnect the heater hoses from the core. Take off the center console, if one is equipped. Then, take off the sound insulators on both sides of the car, the steering column's opening filler, the air outlet duct and the floor air outlet to reach the heater core.
  • Step 3 Disconnect the heater core cover. Remove the core-to-housing mounting clamps and remove the heater core.
  • Step 4 Install the replacement heater core. Connect the mounting clamps and replace the core cover.
  • Step 5 Replace the rear floor air outlet, air outlet duct, steering column opening filler, sound insulators and center console (if equipped). Reattach the heater hoses to the core and the drain tube to the housing.
  • Step 6 Fill the cooling system, using new coolant if the old liquid doesn't appear clean. Be sure the lower radiator hose is securely back in place before filling the radiator. Reconnect the negative battery cable.
  • Step 7 Start up the Oldsmobile Alero's engine and let it run until it reaches normal operating temperature. Observe the climate control operation and check for any leaks in the system.


  • Read more: How to Replace the Heater Core in an Oldsmobile Alero | eHow.com http://www.ehow.com/how_4590629_replace-heater-core-oldsmobile-alero.html#ixzz0uQeICxug

    Posted on Jul 22, 2010

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    SOURCE: Instuctions for 2001 BMW 325i Heater Core Replacement...

    the blower fan on my BMW 530 does not work

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    If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
    When a heater core leaks, a new heater core is installed or the old one repaired.
    Heater Housing
    • The heater housing is usually under the dash and must be removed to gain access to the heater core.
    • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
    f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
    • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
    • Remove the heater coolant hoses.
    • Remove the cable and/or vacuum control lines (if equipped).
    • Remove the heater core securing brackets and/or clamps.
    • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
    • To reinstall the heater core, reverse the removal steps.
    When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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    Removing the Heater Core


    Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
    When a heater core leaks, a new heater core is installed or the old one repaired.
    Heater Housing
    • The heater housing is usually under the dash and must be removed to gain access to the heater core.
    • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
    f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
    • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
    • Remove the heater coolant hoses.
    • Remove the cable and/or vacuum control lines (if equipped).
    • Remove the heater core securing brackets and/or clamps.
    • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
    • To reinstall the heater core, reverse the removal steps.
    When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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    How remove heater core


    Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
    When a heater core leaks, a new heater core is installed or the old one repaired.
    Heater Housing
    • The heater housing is usually under the dash and must be removed to gain access to the heater core.
    • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
    f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
    • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
    • Remove the heater coolant hoses.
    • Remove the cable and/or vacuum control lines (if equipped).
    • Remove the heater core securing brackets and/or clamps.
    • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
    • To reinstall the heater core, reverse the removal steps.
    When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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    4. Remove the heater core from the heater/vent module
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    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.
    CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
    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.
    To install:
    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.
    1990-95 MODELS With A/C

    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.
    To install:
    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.

    Nov 27, 2008 | 1994 Chevrolet G20

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