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It usually doesn't matter-it just circulates coolant through the core and returns it. But the hose going to the water pump is the return hose from the core. The other hose from the cylinder head or intake manifold is where the coolant comes from and going to the heater core. Take off the hose at the water pump and you will see a stream coming out with the engine running and the heater control on hot. Try this and if the stream is not good, try swapping the hoses at the core- I mean take the hose to water pump and fit it to the core's upper hose, and the inlet hose to the lower fitting. It shouldn't matter, but let us know.
Check antifreeze first and foremost, after that when the car is warming up check the temp between the upper hose and lower hose (see if you can get an infrared thermometer). If the lower hose is hot and the upper is cold then you need to replace your thermostat.
The heater hoses are on the back wall behind the motor.The lower one is the inlet and the upper one is the outlet.They might not be that easy to get to.Try doing this with the engine cold so you don`t burn yourself.Hope this helps.Good luck.
Okay sounds like you have a clog within the system, first of all, drain the whole cooling system, run clean water thought the top of the radiator, look to see when the water comes out nice clear, replace the lower hose if you have a petcock close that, refill the top of the radiator, until it is full, start the engine, with engine running turn your heater, let the car warm a little, then reopen the petcock or loosen the lower hose and let the water draw out a little until is pouring out nice and fast, then re-close the petcock and stop the engine. try and get 40% of the water out, and replace it with 50/50 antifreeze fill to the right point of the cars specs.
Disconnect the battery cable, remove the carburetor air cleaner and partially drain the coolant system.
Remove the heater hoses from the heater core.
Remove the glove box liner and remove the register duct by pulling from the instrument panel register and releasing the clip at the plenum.
Disconnect the right cowl outside air inlet vacuum hose from the outside/recirculating door vacuum motor.
Remove the rear housing from under the instrument panel. Remove the outside air inlet duct from the rear housing (4 nuts and 1 bolt) and install one upper nut to retain heater housing-to-dash after rear housing is removed.
Remove two screws retaining plenum-to-dash (above transmission tunnel) and two screws to heater housing and remove the plenum.
Install a piece of protective tape on A-pillar inner cowl panel, at lower right corner of instrument panel.
Remove the lower right instrument panel-to-A-pillar bolt to hold the panel in the rearward position.
Remove the heater core (3 screws retaining 2 plates).
Remove the temperature blend door (snaps off).
Remove the temperature blend door arm support (2 screws) and pivot arm retainer (1 screw).
Remove blower motor (2 screws) and remove blower wheel.
Transfer blower to blower motor and panel assembly.
Install door arm pivot retainer (1 screw) and door arm support (2 screws).
Install the temperature blend door (snaps on).
Install heater core.
Install the plenum (4 screws).
Connect blower wires.
Remove heater housing upper retaining nut and install the heater outlet (4 nuts and 1 bolt). Position the air inlet duct.
Connect the white vacuum hose to the outside/recirculating door vacuum motor.
Reposition the instrument panel, install the retaining bolts and remove the protective tape at the A-pillar inner cowl panel, lower right corner of instrument panel.
Install the right register duct assembly and install the glove box liner.
Connect heater hoses to the heater core assembly.
Fill cooling system, install the air cleaner and connect the battery cable to the battery.
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.
CAUTIONNever open, service or drain the radiator or cooling system when
hot; serious burns can occur from the steam and hot coolant. Also, when
draining engine coolant, keep in mind that cats and dogs are attracted
to ethylene glycol antifreeze and could drink any that is left in an
uncovered container or in puddles on the ground. This will prove fatal
in sufficient quantities. Always drain coolant into a sealable
container. Coolant should be reused unless it is contaminated or is
several years old.
Disconnect the negative battery cable.
Drain the cooling system.
Remove the air intake tube, crankcase breather and PCV hose.
Remove the ignition coil pack and bracket.
Remove the upper radiator hose.
Remove the ignition coil pack bracket.
Unfasten the heater hose inlet tube bracket bolt and remove the heater hose inlet tube from the thermostat housing.
Remove the three thermostat housing attaching bolts, then remove the thermostat housing and gasket.
Fig: Remove the ignition coil pack
Fig. : Detach the air intake tube, crankcase breather and PCV hose
Fig. : Disconnect the upper radiator hose from the radiator
Fig. : Unfasten the ignition coil pack bracket upper bolts...
Fig. : ...and the lower bracket bolt, then remove the bracket