And when release the park park their is a buzzer under the dash on the LH side going off. I have plenty of air. Seat belt plugged in and door closed.

My friend, you have a lot of looking to do. It could be a door latch not closing all the way or a seat belt switch bad. The beeping noise is probably the warning buzzer or beeper under the dash in or near the the fuse panel. Once you find the switch that is bad. you will fix the problem. or you could remove the beeper. Just saying. Please use all caution when working under the dash. Don't knock the vehicle out of gear. Block your wheels from movement in case that should happen. I hope this helps

Could be seat belt Buzzer / Door / Tailgate not closed securely warning Buzzer Stuck ON since car in park these buzzers do not activate but you said under movement sound occurs .. Mechanically I would Check Altenator for Proper Charge output - Then Ground wires for Battery / Corrosion needs cleaning ?? - Plus Dash Cluster must be Grounded Tightly .

Should be under the dash, usually above accelerator pedal or below glove box. My books go back '96; Bottom LH side of Instrument Panel

Its not under the seat. It should be on the bottom of the dash near the parking brake, or on the side of the dash where the door closes against the dash. There should be a panel covering the fuse box.

Check under both seats and make sure the wire harness is plugged in all the way. Some times shoving stuff under the seat unplugs wiring harness; seat belt sensor, occupant weight senor for air bags, heated seats & power seats (could be more than one wiring harness. Look inside belt buckle fastener; is it crusty with anything (food, crumbs, coin change)? Blow it out with a portable can of air. Make sure both the male/female parts of belt are clean, non-rusted/corroded & non-damaged to make good electrical connection when belted in; this turns off your belt warning light and bell. Check all wiring from the belt buckle release a the way down to under the seat; both sides...both seats They both seats could be interlinked into system; when one fails (bad connection) the other seat sensor fails also.

turn on ignition so seat belt buzzes.look under dash to locate buzzer and unplug buzzer unit

Section 12-03: Air Conditioning System 1992 Town Car/Crown Victoria/Grand Marquis Workshop Manual REMOVAL AND INSTALLATION Plenum Removal

1. Disconnect battery ground cable.

1. Disconnect the heater hoses from the heater core tubes. Plug the ends of the heater hoses to prevent coolant loss.

1. Plug heater core tubes securely to prevent coolant leakage from heater core during plenum removal.

1. Remove three nuts located below the windshield wiper motor retaining the LH end of the plenum to the dash panel (Fig. 15).

FIG. 15 Plenum and Air Inlet Duct Removal

1. Remove one nut retaining the upper LH corner of the evaporator case to the dash panel.

1. Remove LH and RH lower instrument panel insulators.

1. Disconnect two vacuum supply hoses from vacuum source. Push grommet and vacuum supply hose into passenger compartment.

1. Remove all instrument panel retaining screws and pull the instrument panel back as far as possible without disconnecting any wire harnesses.

1. Loosen the RH door sill plate and remove the RH side cowl trim panel.

1. On manual systems, disengage the temperature control cable housing from the bracket on top of the plenum. Disconnect the cable from the temperature blend door crank arm. On ATC systems, remove cross body brace and disconnect wiring harness from temperature blend door actuator and disconnect the ATC sensor tube from the evaporator case connector.
   

1. Disconnect the vacuum jumper harness at the multiple vacuum connector near the floor air distribution duct.

1. Disconnect the white vacuum hose from the outside-recirculating door vacuum motor.

1. Remove two hush panels.

1. Remove one plastic push fastener retaining the floor air distribution duct to the LH end of the plenum. Remove LH screw and loosen RH screw on the rear face of the plenum (Fig. 14), and remove the floor air distribution duct.

1. Remove two nuts from the two studs along the lower flange of the plenum.

1. Carefully move plenum rearward to allow heater core tubes and the stud at the top of the plenum to clear holes in the dash panel. Remove plenum from vehicle by rotating the top of the plenum forward, down and out from under the instrument panel. Carefully pull lower edge of instrument panel rearward as necessary while rolling the plenum from behind the instrument panel.

Installation

1. Route the vacuum supply hose through the dash panel and seat the grommet in the opening.

1. 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.

1. Install three nuts on the studs along the lower flange and one on the upper flange of the plenum (Fig. 15).

1. Install three nuts below the windshield wiper motor to attach the LH end of the plenum to the dash panel.

1. Install one nut to retain the upper LH corner of the evaporator case to the dash panel.

1. Position floor air distribution duct on plenum. Install two screws and plastic push fastener.

1. If removed, position panel door vacuum motor to the mounting bracket. Install two retaining screws.

1. Connect the white vacuum hose to the outside-recirculating door vacuum motor.

1. Connect the vacuum jumper harness to the plenum harness at the multiple vacuum connector near the floor air distribution duct. Install floor duct.

1. Connect the ATC sensor tube to the evaporator case connector on ATC equipped vehicles.

1. Install the cross body brace and connect wiring harness to the blend door actuator on ATC equipped vehicles.

1. 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 as outlined under Adjustments.

1. Install the bolt to attach the lower RH end of the instrument panel to the side cowl.

1. Install the RH side cowl trim panel and tighten the RH door sill plate retaining screws.

1. Install glove compartment door and check arms.

1. Connect vacuum supply hose to vacuum supply.

1. Install RH and LH lower instrument panel insulators.

1. Install two hush panels.

1. Unplug the heater core tubes and connect the heater hoses to the heater core tubes.

1. Fill the cooling system with coolant to replace coolant lost during removal of the plenum.

1. Connect the battery ground cable. Check the system for proper operation.

does it do it on the driver side? hook it up without sitting in the seat start the rig if the buzzer is on sit in the seat if it is still on you have a bad ground on the seatbelt side the short belt that it connects to. the buzzer is under the dash driver side above the sterring wheel.

SECTION 412-03: Air Conditioning 1999 Continental Workshop Manual REMOVAL AND INSTALLATION Evaporator Core Removal
NOTE: The evaporator core is serviced as a core and housing assembly. The evaporator core, internal doors, seals and door linkage are included with the housing. Transfer the blower motor and wheel assembly, heater core and cover, dash panel seals and vacuum actuators to the new housing.

1. Remove the rear seat airflow duct (18C420). For additional information, refer to Section 412-01 .

1. Remove the instrument panel (04320). For additional information, refer to Section 501-12 .

Instrument Panel Removal
CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.

1. Remove the passenger side air bag module. For additional information, refer to Section 501-20B .

1. If equipped, remove the floor console; refer to Console—Floor .

1. If equipped, remove the mini console; refer to Console—Mini .

1. If equipped, remove the rear seat climate control air duct sleeve.

1. Remove the steering column; refer to Section 211-04 .

1. Release the cable from the parking brake actuator.
   1. Release the cable from the parking brake actuator.
   1. Release the cable conduit from the parking brake actuator.

1. Disconnect the LH outboard bulkhead electrical connector.
   1. Loosen the bolt.
   1. Disconnect the LH bulkhead electrical connector.

1. Disconnect the LH inboard bulkhead electrical connector.
   1. Loosen the bolt.
   1. Disconnect the LH bulkhead electrical connector.

1. If equipped, disconnect the heated seat switch electrical connectors.

1. Remove the steering column mounting support to instrument cowl brace bolts.

1. Remove the instrument panel dash brace to instrument panel bolt.

1. Position the instrument panel dash brace aside.
   1. Loosen the nut.
   1. Position the instrument panel dash brace aside.

1. Remove the RH instrument panel insulator (046A24).
   1. Remove the pin-type retainers.
   1. Remove the RH instrument panel insulator.
      • Remove the courtesy lamp.

1. Disconnect the vacuum harness connector.

1. Disconnect the in-line electrical harness connector.

1. Position the RH scuff plate aside.

1. Remove the RH cowl trim panel.

1. Disconnect the antenna in-line connector.

1. Remove the ignition/shifter interlock cable from the bracket and the shifter interlock cam.

1. Remove the instrument panel defroster opening grille assembly.
   1. Lift upward to release the instrument panel defroster opening grille assembly from the instrument panel.
   1. Disconnect the two electrical connectors (one each side).
   1. Remove the instrument panel defroster opening grille assembly.

1. Remove the instrument panel cowl top screws.

1. Remove the RH instrument panel support to cowl side nut.

1. Remove the LH instrument panel support to cowl side bolts.

1. Loosen the LH instrument panel support to cowl side captive bolt.

1. Position the instrument panel away from the cowl.
   • Disconnect the electronic air temperature control (EATC) hose from the heater plenum.

1. NOTE: Two technicians are required to carry out this step.
   NOTE: Check the cowl top clips for damage, looseness, or stripped fasteners.
   Remove the instrument panel (04320).

1. Drain the coolant from the radiator so that the coolant level is below the heater core (18476). For additional information, refer to Section 303-03 .

1. Recover the refrigerant. For additional information, refer to Section 412-00 .

1. Loosen the screw and disconnect the electrical connector from the powertrain control module (PCM) (12A650).

1. Disconnect the heater water hoses (18472) from the heater core.

1. Disconnect the vacuum supply hose.

1. Disconnect the condenser to evaporator tube and the evaporator to accumulator tube spring lock couplings from the A/C evaporator core (19860). For additional information, refer to Section 412-00 .

1. Disconnect the evaporator housing electrical connectors.

1. Remove the nuts and the washers at the cowl panel.

1. Remove the screws and the A/C evaporator housing.

1. Remove the screws and the metal cover.

1. Remove the screws and the A/C electronic blend door actuator.

1. Remove the A/C air intake flue damper assist spring (19917).

1. CAUTION: Do not attempt to bend any part of the A/C damper door shaft (19A580). It is brittle and will break.
   Depress the locking ramp and remove the A/C damper door shaft from the air temperature control door shaft.

1. CAUTION: Do not attempt to bend any part of the lever. It is brittle and will break.
   Remove the A/C evaporator case outlet door shaft (19B752).

1. Remove the A/C tube dash panel seal (19B588) and the A/C evaporator drain tube seal (19B739).

have you tried unplugging the 2 prong plug under the seat(its right under the seat belt buckle)? i have a 98 mitsubishi eclipse and i simply unplugged it and it disabled the buzzer. if that doesn't work, you can connect the 2 wires (on the harness side) either by bridging the 2 terminals with a jumper wire or you can cut the plug off and just twist the 2 wires together.