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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Mercury
Satisfied Customers: 13187
Experience:  Have owned a repair shop for 25 yrs.
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Mercury: how do i remove the dash to replace a heater core

Resolved Question:

how do i remove the dash to replace a heater core in a 2001 grand marque?
Submitted: 3 years ago.
Category: Mercury
Expert:  Tim's Auto Repair replied 3 years ago.

hi

this may help you

thanks

 

Ford Crown Victoria, Mercury Grand Marquis, Marauder, Lincoln Town Car 1999-2005

Removal & Installation

  • TOWN CAR

If equipped, turn the air suspension service switch to the OFF position before raising the vehicle.

  1. Drain the cooling system.
  2. Remove or disconnect the following:

    Negative battery cable Front seats Carpeting Rear airflow duct Heater hoses
  3. Remove the driver-s side air bag module by removing or disconnect the following:

    SRS module-to-steering wheel bolts, from both sides of the steering wheel. SRS module and disconnect the electrical connector Horn switch electrical connector
  4. Remove the passenger-s side SRS module by removing or disconnecting the following:

    Open the glove box and disconnect the glove compartment isolator Push inward on the 2 glove box door tabs and lower it SRS module-s electrical connector SRS module-to-instrument panel bolts and the module
  5. Remove the instrument panel by removing or disconnecting the following:

    Speed control servo nuts and move the servo aside Bolt and disconnect the left side bulkhead connector Left side bulkhead connector from the dash panel Windshield washer fluid reservoir screw, and position the reservoir aside Blower motor electrical connector Air conditioning pressure cut-off switch electrical connector In-line electrical harness connector Electronic Automatic Temperature Control (EATC) variable blower motor controller electrical connector Right front wheel Right front fender splash shield bolts and move the shield away from the cowl Wiring harness from the evaporator case Wiring harness from the cowl Right side instrument panel lower insulator pushpins, disconnect the power point electrical connector, remove the courtesy lamp from the socket and remove the insulator Unseat the wiring grommet and feed the wiring harness through the cowl Cowl side trim panels and the windshield side garnish moldings from both sides Locking clip and the Electronic Crash Sensor (ECS) module electrical connector Antenna connector Ground wire bolts from the right side EATC hose at the evaporator housing Bolt and disconnect the bulkhead connector from the right side Pull the door weatherstrip seals away from the instrument panel on both sides Tunnel brace trim cover Climate control head vacuum harness connector Instrument panel tunnel brace nuts and the brace Ground wire bolts from the left side Wiring harness connectors from the left side Parking brake switch electrical connector
    1. Pry out the instrument panel defroster opening grille, disconnect the electrical connectors and the remove the grille.

  6. Remove or disconnect the following:

    3 upper instrument panel screws Instrument panel cowl side nut from both sides Instrument panel cowl side bolt from the left side Instrument panel Windshield wiper mounting arm and the pivot shaft Electrical connector and remove the upper cowl extension screw and the extension Vacuum hoses and the wire harness connector from the evaporative emissions canister purge valve Evaporative emissions purge valve nuts and the valve Cowl side nut Right side rear fender apron screws and reposition the apron Evaporator housing nut and screw Vacuum hoses and the wiring harness connectors Plenum chamber-s lower flange nuts Plenum chamber-s upper flange nut and the plenum chamber Heater core cover-to-heater plenum chamber screws and the cover Seal and the heater core

    FIG : View of the instrument panel finish panels

    image

  7. FIG : Exploded view of the instrument panel-Crown Victoria and Grand Marquis image

  8. FIG : Exploded view of the heater air plenum chamber, the evaporator housing and the air inlet duct image

  9. FIG : View of the heater core image

  10. FIG : Exploded view of the instrument panel-Town Car

    image

  11. To install:

    1. Install or connect the following:

      Seal and the heater core Heater core cover and the cover-to-heater plenum chamber screws Plenum chamber and the plenum chamber-s upper flange nut Plenum chamber-s lower flange nuts Vacuum hoses and the wiring harness connectors Evaporator housing nut and screw Right side rear fender apron and the apron screws Cowl side nut Evaporative emissions purge valve and the valve nuts Vacuum hoses and the wire harness connector to the evaporative emissions canister purge valve Electrical connector; then, install the upper cowl extension screw and the extension Windshield wiper mounting arm and the pivot shaft
    2. Install the instrument panel by installing or connecting the following:

      Instrument panel At the left side, install the instrument panel cowl side bolt Instrument panel cowl side nut on both sides 3 upper instrument panel screws Electrical connectors and the install the instrument panel defroster opening grille Parking brake switch electrical connector Wiring harness connectors on the left side Ground wire bolts on the left side Instrument panel tunnel brace and the brace nuts Climate control head vacuum harness connector Install the tunnel brace trim cover. Door weatherstrip seals to the instrument panel on both sides Bulkhead connector and tighten the bolt on both sides EATC hose at the evaporator housing Ground wire bolts on the right side Antenna connector ECS module electrical connector and the locking clip Cowl side trim panels and the windshield side garnish moldings on both sides Feed the wiring harness through the cowl and seat the wiring grommet Right side instrument panel lower insulator, connect the power point electrical connector, install the courtesy lamp to the socket and secure the insulator with pushpins Wiring harness from the cowl Wiring harness to the evaporator case Right front fender splash shield and the shield bolts Right front wheel EATC variable blower motor controller electrical connector In-line electrical harness connector Air conditioning pressure cut-off switch electrical connector Blower motor electrical connector Windshield washer fluid reservoir and the reservoir screw Left side bulkhead connector to the dash panel Left side bulkhead connector and tighten the bolt Speed control servo and the servo nuts Right SRS module and torque the module-to-instrument panel bolts to 62-97 inch lbs. (7-11 Nm) Right SRS module electrical connector Glove compartment isolator Glove box door Horn switch electrical connector Electrical connector and install the left SRS module Left SRS module-to-steering wheel bolts on both sides of the wheel, and torque the bolts to 90-122 inch lbs. (10-14 Nm) Rear airflow duct Carpeting Front seats Heater hoses
    3. Refill the cooling system.
    4. Connect the negative battery cable.
    5. Operate the engine to normal operating temperature. Check the climate control operation and check for leaks.

    Town Car

    1. Disconnect the negative battery cable.
    2. Drain the cooling system and disconnect the heater hoses from the heater core tubes. Plug the hoses and the heater core tubes to prevent coolant leakage.
    3. Remove the 3 nuts located below the windshield wiper motor attaching the left end of the plenum to the dash panel. Remove the 1 nut retaining the upper left corner of the evaporator case to the dash panel.
    4. Disconnect the vacuum supply hose(s) from the vacuum source. Push the grommet and vacuum supply hose(s) into the passenger compartment.
    5. Remove the right and left lower instrument panel insulators.
    6. On 1988-93 vehicles:
      1. Remove the 3 glove compartment hinge screws, disconnect the check arms and remove the glove compartment. Loosen the right door sill plate and remove the right side cowl trim panel. Remove the bolt attaching the lower right end of the instrument panel to the side cowl. Remove the instrument panel pad as follows:
      2. Remove the 2 screws attaching the pad to the instrument panel at each defroster opening. Be careful not to drop the screws into the defroster openings.
      3. Remove the one (shouldered) screw attaching each outboard end of the pad to the instrument panel.
      4. Remove the line of screws attaching the lower edge of the pad to the instrument panel. Pull the instrument panel pad rearward and remove it from the vehicle.

    7. On 1988-89 vehicles:
      1. Remove all instrument panel mounting screws and pull the instrument panel back as far as it will go without disconnecting any wiring harnesses.
      2. Make sure the nuts attaching the instrument panel braces to the dash panel are removed.
      3. Loosen the right door sill plate and remove the right side cowl trim panel.
      4. Disconnect the temperature control cable from the ATC sensor. Disconnect the vacuum harness line connector from the ATC sensor harness and disconnect the electrical connector from the ATC servo connector.

    8. On 1990-00 vehicles:
      1. Remove the cross body brace and disconnect the wiring harness from the temperature blend door actuator.
      2. Disconnect the ATC sensor tube from the evaporator case connector.

    9. Disconnect the vacuum jumper harness at the multiple vacuum connector near the floor air distribution duct. Disconnect the white vacuum hose from the outside-recirculating door vacuum motor.
    10. Remove the 2 hush panels.
    11. Remove 1 plastic push fastener retaining the floor air distribution duct to the left end of the plenum. Remove the left screw and loosen the right screw on the rear face of the plenum and remove the floor air distribution duct.
    12. Remove the 2 nuts from the 2 studs along the lower flange of the plenum.
    13. Carefully move the plenum rearward to allow the heater core tubes and the stud at the top of the plenum to clear the holes in the dash panel. Remove the plenum from the vehicle by rotating the top of the plenum forward, down and out from under the instrument panel. Carefully pull the lower edge of the instrument panel rearward, as necessary, while rolling the plenum from behind the instrument panel.
    14. On 1988-1989 vehicles, remove the ATC servo from the plenum.
    15. Remove the 4 retaining screws from the heater core cover and remove the cover from the plenum assembly. Pull the heater core and seal assembly from the plenum assembly.

    To install:

    1. Carefully install the heater core and seal assembly into the plenum assembly. Visually check to ensure that the core seal is properly positioned. Position the heater core cover and install the 4 retaining screws.
    2. On 1988-1989 vehicles, install the ATC servo on the plenum.
    3. Route the vacuum supply hose through the dash panel and seat the grommet in the opening.
    4. Position the plenum under the instrument panel with the register duct opening up and the heater core tubes down. Rotate the plenum up behind the instrument panel and position the plenum to the dash panel. Insert the heater core tubes and mounting studs through their respective holes in the dash panel and the evaporator case.
    5. Install the 3 nuts on the studs along the lower flange and one on the upper flange of the plenum. Install the 3 nuts below the windshield wiper motor to attach the left end of the plenum to the dash panel and the one nut to retain the upper left corner of the evaporator case to the dash panel.
    6. Position the floor air distribution duct on the plenum. Install the 2 screws and plastic push fastener. If removed, position the panel door vacuum motor to the mounting bracket and install the 2 attaching screws.
    7. Connect the white vacuum hose to the outside-recirculating door vacuum motor. Connect the vacuum jumper harness to the plenum harness at the multiple vacuum connector near the floor air distribution duct. Install the floor duct.
    8. If equipped with manual air conditioning, connect the temperature control cable housing to the bracket on top of the plenum and connect the temperature control cable to the temperature blend door crank arm. Adjust the temperature cable.
    9. If equipped with ATC, proceed as follows:
    10. Connect the temperature control cable to the ATC sensor and adjust the cable. Route and connect the vacuum harness connector to the ATC sensor and connect the electrical connector to the ATC servo connector. Do not block the sensor aspirator exhaust port with the excess vacuum harness. Install the ATC sensor tube between the sensor and the evaporator connector.
    11. On 1990-00vehicles:
      1. Connect the ATC sensor tube to the evaporator case connector.
      2. Install the cross body brace and connect the wiring harness to the blend door actuator.
      3. Install the bolt to attach the lower right end of the instrument panel to the side cowl. Install the right side cowl trim panel and tighten the right door sill plate attaching screws.

    12. On 1988-1989 vehicles install the instrument panel pad and the glove compartment door.
    13. On 1990-99 vehicles, push the instrument panel back into position and install all instrument panel mounting screws. Install the right and left lower instrument panel insulators.
    14. Connect the vacuum supply hose(s) to the vacuum source.
    15. Install the right and left lower instrument panel insulators and install the 2 hush panels.
    16. Unplug the heater core tubes and the heater hoses and connect the heater hoses to the heater core tubes. Fill the cooling system.
    17. Connect the negative battery cable and check the system for proper operation.
Customer: replied 3 years ago.
i have the 2 lower nuts inside off the heater core box and the 1 outside by the 2 heater hoses. What else is holding in the heater core box? Its loose and wiggle but it is still hung up on something
Expert:  Tim's Auto Repair replied 3 years ago.
the one near the wiper motor..did you take it loose?
Customer: replied 3 years ago.
so there are 4 nuts?
Expert:  Tim's Auto Repair replied 3 years ago.

yes..there should be one at the wiper motor

thanks

Tim's Auto Repair, mechanic
Category: Mercury
Satisfied Customers: 13187
Experience: Have owned a repair shop for 25 yrs.
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