I assume he used a leak tester and found a leak in the evap which is inside the plenum housing. Need to remove the plenum to get access to the evap. big job. If you are technical, you could remove the plenum assembly and let him replace the evap & then let you out the plenum back in. Then take back to have him evacuate and recharge system.
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SECTION 412-03: Air Conditioning
1999 Town Car Workshop Manual
REMOVAL AND INSTALLATION
Evaporator Core
Removal and Installation
NOTE: The evaporator core is not separately serviceable. It is serviced only with the evaporator core housing assembly.
NOTE: Installing a new suction accumulator is not required when repairing the refrigerant system except when there is physical evidence of system contamination from a failed A/C compressor or damage to the suction accumulator.
NOTE: If an evaporator core leak is suspected, the evaporator core must be leak tested before it is removed from the vehicle. For additional information, refer to Section 412-00 .
- Remove the evaporator core housing. For additional information, refer to Section 412-02 .
- Transfer the components from the old evaporator core housing to the new evaporator core housing
- Install the evaporator core housing. For additional
- information, refer to Section 412-02
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Evaporator Core Housing
Removal
- Disconnect the battery ground cable (14301).
- Recover the refrigerant. For additional information, refer to Section 412-00 .
- Drain the radiator. For additional information, refer to Section 303-03 .
- Remove the screws and the RH cowl vent screen.
- Disconnect the vacuum hoses and the wire harness connector from the evaporative emission canister purge valve (EVAP canister purge valve) (9C915).
- Remove the nuts and remove the evaporative emission canister purge valve.
- Remove the heater hoses from the heater core.
- Remove the screw and reposition the windshield washer fluid reservoir.
- Disengage the four wire harness retainers from the top of the RH fender apron.
- Remove the RH front wheel and tire.
- Remove the screws from the RH fender apron and remove the fender apron.
- Disconnect the wire harness connector from the A/C cycling switch (19E561).
- Disconnect the wire harness connector from the blower motor (18527).
- Disengage the wire harness connector from the retainer.
- Disconnect the evaporator to compressor suction line from the suction accumulator/drier (19C836). For spring lock couplings disconnect and connect general procedure, refer to Section 412-00 .
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CAUTION: To prevent damage to the fitting and the tube, use a backup wrench when removing the suction accumulator/drier.
Disconnect the suction accumulator/drier from the A/C evaporator core.
- Remove the clamp screw retaining the A/C accumulator mounting bracket to the A/C evaporator core housing and remove the suction accumulator/drier.
- Disconnect the condenser to evaporator tube from the A/C evaporator core (19860). For spring lock couplings disconnect and connect general procedure, refer to Section 412-00 .
- Remove the RH instrument panel insulator.
- Disengage the courtesy lamp holder.
- Disconnect the power point wire harness connector and remove the RH instrument panel insulator.
- Remove the in-car temperature sensor hose and elbow from the evaporator housing.
- Remove the nuts at the top of the evaporator housing.
- Remove the nuts at the bottom of the evaporator housing.
- Remove the screw and nut near the blower motor.
- Remove the screws.
- Separate the housing and remove the blower motor and A/C evaporator core.
- Disconnect the wire harness connector.
- Remove the evaporator core cover.
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