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Master
359 Answers
- Posted on Mar 09, 2011
Re: How to remove the heater core. It is a 1999 Mercury...
Below are directions. It is a fairly big job has the entire dash has to come out:
If equipped, turn the air suspension service switch to the OFF position before raising the vehicle.
Drain the cooling system.
- Remove or disconnect the following:
Negative battery cable
- Front seats
- Carpeting
- Rear airflow duct
- Heater hoses
- 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
- 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
- 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
- Pry out the instrument panel defroster opening grille, disconnect the electrical connectors and the remove the grille.
- 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
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