Water in air chamber - 1994 Toyota 4Runner

possibly is
at the bottom of the windscreen there is a plenum chamber that collects the water from the screen and drains it out via a tube either side into the front wheel wells
these drains can block up from leaves , dirt or rust and that will then retain water in the chamber giving you the sloshing noise as you drive
the chanber is where you normally get fresh air into the vehicle when you open up the fresh air control

Water leak check:
1. Plenum chamber leaks at loom exits (Accident damage or corrosion)
2. Water leak at air con fan inlet (Accident damage or gasket wear)
3. Water leaking from air con heater pipe (corroded water pipe to/from heat exchanger)

did you run thru water or was there a heavy rain or lots of snow??

Check your air filter housing and the air intake piping. There is a reason why there are high level air intakes available for your vehicle, it is to stop water getting inside the combustion chambers. There is a possibility that your engine has sucked water into the induction system. It needs to be checked and cleaned as soon as possible. Water in the combustion chambers WILL kill your engine.

I'm sorry but I think you have a blown head gasket. From what you are describing it sounds like the gasket has blown between the cooling jacket and combustion chamber. That explains the overheating and the coolant wanting to pump out of the radiator. You have 500+ degrees of hot air being pumped into the cooling chamber and its forcing the coolant up and out as it is trying to escape. Good luck

Passenger side under the van at the base of the engine bulkhead.

It sounds like the drain tube for the evaporator chamber is blocked by dirt or small leaves and is not allowing any condensed water to drain awa, consequently reducing air flow and producing a gurgling sound. Check under dash for a rubber hose that runs from under the evaporator chamber and air ducting through to engine bay. A bit of sqeezing may help dislodge blockage but it may need removing fully to clean properly.

It appears that the drain for the plenum chamber is choked up with dirt or leaves. This chamber is under the air intake grill that is in front ot the bottom of the windscreen. The drain tubes are usually situated near the outside ends ot the chamber. If you shine a torch down through the grill you should be able to see the drain hole. Try poking some wire down the hole to clear the blockage. If there is lots of rubbish in the chamber you will have to remove the grill to get it all out.

big job, dificulty 8 on a 10 scale Heater Air Plenum Chamber Removal

1. Remove heater outlet floor duct (18C433) as described.
   

1. Remove instrument panel (04320). Refer to Section 01-12 .
   

Instrument Panel SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Radio Removing Tool 415-001 (T87P-19061-A)
Removal and Installation

1. Disconnect battery ground cable (14301).
   

1. Remove RF wheel and tire assembly. Refer to Section 04-04 .
   

1. Remove three nuts in radiator coolant recovery reservoir area.
   

1. Remove bolt retaining front fender apron (16054) to front fender (16005) .
   

1. Position front fender splash shield out of the way.
   

1. Lower vehicle.
   

1. Tag and remove main harness connector from jumper harness (located in front of blower motor).
   

1. Remove steering column. Refer to Section 11-04 .
   

1. Remove RH cowl side trim panel (02344) and LH cowl side trim panels (02345) .
   

1. Tag and disconnect wiring connectors in LH and RH cowls.
   

1. Remove ground wire located on LH cowl side.
   

1. 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.
   

1. Remove glove compartment (06010).
   

1. Remove instrument panel upper finish panel (044A90) and disconnect the A/C sunload sensor (19E663) and anti-theft indicator, if equipped.
   

1. Disconnect the heater water hoses (18472) from the heater core tubes. Plug the ends of the heater water hoses to prevent coolant loss.
   

1. Plug heater core tubes securely to prevent coolant leakage from heater core (18476).
   

1. Remove one nut retaining the upper LH corner of the A/C evaporator core housing (19A559) to the dash panel (01610) .
   

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

1. Disconnect wiring harness from A/C electronic blend door actuator.
   

1. Disconnect the white vacuum hose from the heater and A/C air inlet duct door vacuum control motor (18A318).
   

1. Remove nuts from the studs along the lower flange of the heater air plenum chamber (18471).
   

1. Disconnect connectors to A/C electronic blend door actuator and electronic module on side of heater air plenum chamber.
   

1. Remove heater air plenum chamber by pulling rearward.
   

Heater Air Plenum Chamber and Air Inlet Duct





Item Part Number Description 1 19C836 Suction Accumulator/Drier 2 56956-S2 Screw (2 Req'd) 3 386877-S36 Screw 4 45445-S36 Nut and Washer Assy 5 19C928 A/C Recirculating Air Duct Screen 6 386877-S36M Screw (2 Req'd) 7 45332-S12 Nut and Washer 8 19B762 A/C Air Inlet Door Inner Seal 9 19C590 A/C Recirculating Air Duct 10 18471 Heater Air Plenum Chamber 11 18C433 Heater Outlet Floor Duct 12 55734-S2 Nut 13 19A559 A/C Evaporator Core Housing 14 45332-S2 Nut and Washer A — Tighten to 2.5-3.2 Nm (23-28 Lb-In)
Installation

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

1. 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 .
   

1. 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.
   

1. Install three nuts on the studs along the lower flange and one on the upper flange of the heater air plenum chamber.
   

1. Install three nuts below the windshield wiper motor (17508) to retain the LH end of the heater air plenum chamber to the dash panel.
   

1. Install one nut to retain the upper LH corner of the A/C evaporator core housing to the dash panel .
   

1. Connect the white vacuum hose to the heater and A/C air inlet duct door vacuum control motor.
   

1. 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.
   

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

1. Connect vacuum supply hose to vacuum supply.
   

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

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

1. Install heater outlet floor duct as described.
   

1. 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 Heater Core 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 .

1. Remove the heater air plenum chamber (18471) assembly as described.
   

1. Remove the heater dash gasket (18570) from the heater air plenum assembly.
   

1. Remove the four retaining screws from the heater core cover (18B300) and remove the heater core cover from the heater air plenum chamber assembly.
   

you have to remove the plenum case behind the dash. I will provide 94 gr marquis. don't have 84.



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Section 12-03A: Air Conditioning System—Manual A/C-Heater 1994 Crown Victoria/Grand Marquis. Workshop Manual
REMOVAL AND INSTALLATION Heater Core Removal

1. Remove the heater air plenum chamber assembly as outlined.
2. Heater Air Plenum Chamber Removal
   
   1. Disconnect battery ground cable .
   1. Disconnect the heater water hoses from the heater core tubes. Plug the ends of the heater water hoses to prevent coolant loss.
   1. Plug heater core tubes securely to prevent coolant leakage from heater core during heater air plenum chamber removal.
   1. Remove three nuts located below the windshield wiper motor (17508) retaining the LH end of the heater air plenum chamber to the dash panel .
   1. Remove one nut retaining the upper LH corner of the A/C evaporator core housing 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. Remove cross body brace and disconnect wiring harness from A/C electronic door actuator motor (19E616) and disconnect the sensor tube from the evaporator case connector.
   1. Disconnect the vacuum jumper harness at the multiple vacuum connector near the heater outlet floor duct.
   1. Disconnect the white vacuum hose from the heater and A/C air inlet duct door vacuum control motor.
   1. Remove two hush panels.
   1. Remove one plastic push fastener retaining the heater outlet floor duct to the LH end of the heater air plenum chamber . Remove LH screw and loosen RH screw on the rear face of the heater air plenum chamber and remove the heater outlet floor duct .
   1. Remove two nuts from the two studs along the lower flange of the heater air plenum chamber .
   1. Carefully move heater air plenum chamber rearward to allow heater core tubes and the stud at the top of the heater air plenum chamber to clear holes in the dash panel. Remove heater air plenum chamber from vehicle by rotating the top of the heater air plenum chamber forward, down and out from under the instrument panel . Carefully pull lower edge of instrument panel rearward as necessary while rolling the heater air plenum chamber from behind the instrument panel .

1. Remove the four retaining screws from the heater core cover (18B300) and remove the heater core cover from the heater air plenum chamber assembly.
   
   Heater Core Removal
   
   
   
   
   
   Item Part Number Description 1 390092-S2 Screw (2 Req'd) 2 18658 Heater Core Case Seal 3 18476 Heater Core 4 18570 Heater Dash Gasket 5 18471 Heater Air Plenum Chamber 6 18B300 Heater Core Cover

1. Pull the heater core assembly from the heater air plenum chamber assembly.

Installation

1. Carefully install heater air plenum chamber assembly into the heater air plenum chamber assembly. Visually check to ensure that core seal is properly positioned.

1. Position the heater core cover and install the four retaining screws.

1. Install the heater air plenum chamber assembly as outlined.