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Quinton, this is a job that's very hard if you've never repaired cars before. The entire dash must be removed to gain access to the heater box that must also be removed to change out the core. You can google: how to replace heater core on 96 Lincoln town car. This will give you video's on how its done and give you an idea of the work involved. Hope this helps and have an awesome day Quinton.
Some heater cores are quite complex in removing. They are sometimes buried behind the dash board. Often other parts of the dash will also have to come out (Glove compartment) to reach it. You have to locate and remove the heater box under the dash (usually on the passenger side) after disconnecting the heater hoses under the hood by the firewall. The heater box will have a wire harness and/or cables connected to it that will have to be disconnected before the box will drop out. Once the heater box is out...remove the cover and heater core and reinstall in the reverse order that it was removed.
96' or 97' it makes a big difference. 96' models are very simple if you have a basic understanding of automotive work and some basic tools. remove the glove box, the heater core is located behind a panel just inside and below the glove box hole. first remove the plastic panel but not the heater core, to the left of the heater core inside the box is the blend door that separates the heater and A/C cores. this door is often obstructed by pens, pencils, or plastic junk that have fallen down into the defrost vents on top of the dash and landed in the box. something like this will stop the blend door from being able to close the A/C core off from the vents allowing cold air in. if you have big hands like mine you may need a woman or teenager to reach into the box and check for debris but you can see the door open and close when you turn the switch so you know where to check. if you have a 97' model the blend door actuator is electric and usually not accessible without removing the dash and heater/A/C box from the firewall. good luck
big job, dificulty 8 on a 10 scale
Heater Air Plenum Chamber
Remove heater outlet floor duct (18C433) as described.
Remove instrument panel (04320). Refer to Section 01-12 .
SPECIAL SERVICE TOOL(S) REQUIRED
Radio Removing Tool
415-001 (T87P-19061-A) Removal and Installation
Disconnect battery ground cable (14301).
Remove RF wheel and tire assembly. Refer to Section 04-04 .
Remove three nuts in radiator coolant recovery reservoir area.
Remove bolt retaining front fender apron (16054) to front fender (16005) .
Position front fender splash shield out of the way.
Tag and remove main harness connector from jumper harness (located in front of blower motor).
Remove steering column. Refer to Section 11-04 .
Remove RH cowl side trim panel (02344) and LH cowl side trim panels (02345) .
Tag and disconnect wiring connectors in LH and RH cowls.
Remove ground wire located on LH cowl side.
Remove RH instrument panel upper moulding (04268) and LHinstrument panel moulding (04389) from instrument panel (04320) by pulling away from instrument panel and snapping out of retainers. Disconnect wiring connectors as required.
Remove glove compartment (06010).
Remove instrument panel upper finish panel (044A90) and disconnect the A/C sunload sensor (19E663) and anti-theft indicator, if equipped.
Disconnect the heater water hoses (18472) from the heater core tubes. Plug the ends of the heater water hoses to prevent coolant loss.
Plug heater core tubes securely to prevent coolant leakage from heater core (18476).
Remove one nut retaining the upper LH corner of the A/C evaporator core housing (19A559) to the dash panel (01610) .
Disconnect two vacuum supply hoses from vacuum source. Push grommet and vacuum supply hose into passenger compartment.
Disconnect wiring harness from A/C electronic blend door actuator.
Disconnect the white vacuum hose from the heater and A/C air inlet duct door vacuum control motor (18A318).
Remove nuts from the studs along the lower flange of the heater air plenum chamber (18471).
Disconnect connectors to A/C electronic blend door actuator and electronic module on side of heater air plenum chamber.
Remove heater air plenum chamber by pulling rearward.
Heater Air Plenum Chamber and Air Inlet Duct
Screw (2 Req'd)
Nut and Washer Assy
A/C Recirculating Air Duct Screen
Screw (2 Req'd)
Nut and Washer
A/C Air Inlet Door Inner Seal
A/C Recirculating Air Duct
Heater Air Plenum Chamber
Heater Outlet Floor Duct
A/C Evaporator Core Housing
Nut and Washer
Tighten to 2.5-3.2 Nm (23-28 Lb-In) Installation
Route the vacuum supply hose through the dash panel and seat the grommet in the opening.
Position the heater air plenum chamber under the instrument panel with the A/C register duct opening up and the heater core tubes down. Connect wire harness connector to A/C electronic blend door actuator and electronic module on side of heater air plenum chamber .
Rotate the heater air plenum chamber up behind the instrument panel and position the heater air plenum chamber to the dash panel. Insert the heater core tubes and mounting studs through their respective holes in the dash panel and the A/C evaporator core housing.
Install three nuts on the studs along the lower flange and one on the upper flange of the heater air plenum chamber.
Install three nuts below the windshield wiper motor (17508) to retain the LH end of the heater air plenum chamber to the dash panel.
Install one nut to retain the upper LH corner of the A/C evaporator core housing to the dash panel .
Connect the white vacuum hose to the heater and A/C air inlet duct door vacuum control motor.
Connect the vacuum jumper harness to the plenum harness at the multiple vacuum connector near the heater outlet floor duct. Install heater outlet floor duct.
Connect the sensor tube to the evaporator case connector on EATC-equipped vehicles.
Connect vacuum supply hose to vacuum supply.
Unplug the heater core tubes and connect the heater water hoses to the heater core tubes.
Fill the cooling system with coolant to replace coolant lost during removal of the heater air plenum chamber.
Install heater outlet floor duct as described.
Install instrument panel. Refer to Section 01-12 .
Section 12-03A: Air Conditioning System—Manual A/C-Heater
1998 Crown Victoria, Grand Marquis Workshop Manual
REMOVAL AND INSTALLATION
Removal NOTE: If a heater core leak is suspected, the heater core must be pressure leak tested before it is removed from the vehicle. Refer to Section 12-00 .
Remove the heater air plenum chamber (18471) assembly as described.
Remove the heater dash gasket (18570) from the heater air plenum assembly.
Remove the four retaining screws from the heater core cover (18B300) and remove the heater core cover from the heater air plenum chamber assembly.
if you have ac, its quite a job, take your time and label all the parts as youremove them, also make notations of the order you have removed them, i think the book calls for 5-6 hrs, hat is for someone expperienced , i have seen the dash diagrams and it did not help much,
That is about a 9 hour job. The heater core in in the Heater Air plenum chamber which is behind the dash. the dash has to be removed to replace the heater core. It is an involved job. Lots of bolts, screws wireing connectord and vacume connectors to remove and un plug. Some are behind the inner fender splash guard. The book wants you to remove the complete Heater Air Plenum, But it can be done with Patience and finess.
Start by draining the coolant, disconnect dash board wiring harness from pcm behind kick panels, disconnect eye shaft, unbolt dashboard and remove dash. (Remember to tape steering wheel in place as it might have a clock spring). You might have to remove some trim panel on top of dash or cluster from dashboard to gain access to retaing bolts, disconnect heater hoses from heater core in engine compartment and remove heater core, reverse install.