Question about 1999 Mercury Grand Marquis

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1999 Mercury Grand Marquis

I'm trying to change my own heater core.I have dash torn apart and can,t see daylight at end of tunnel.Where can I find out how to remove core.I've been out of work for 5 months or I would pay someone.

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Wher do you live ? Im in GA.

Posted on Dec 03, 2008

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Run self test on heater control head 1999 grand marquis


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follow the cold line with your hand .
or its working and the vent flapper is disconnected .
its the one that's tied to the front buttons / lever on front panel.
you should hear it switch between cold an hot as the flap closes opens. it will be definitely heard. it sucks vacuum an plops close/open.
more than likely you have a loose bad vacuum line/lever in dash.

Jul 10, 2014 | 1999 Mercury Grand Marquis

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Air conditioner blows heated air


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If the compressor is running and the system is full of freon, you may have a blend door problem under the dash. The blend door directs air flow thru the heater core and evaporator core depending on the temp setting on the dash.

Jul 24, 2012 | 2000 Mercury Grand Marquis

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Need to replace heater corein a 1992 grand marquis


This can be a very difficult and time consuming repair. Basically you just have to remove enough of the dash to allow access to the heater core. Go slow and do not break any parts. Take digital photos so you will be able to reassemble everything. Once you get to it, you simply disconnect the hoses under the hood and remove and replace the core, and reconnect the hoses. You then start the engine and add the necessary coolant and bleed all air from the system with the heater set to hot. This is not an easy repair and requires knowledge of how the dash comes apart. If you are not comfortable trying this then you may want to seek out a professional who has done this before on an older Mercury.

Oct 27, 2009 | 1992 Mercury Grand Marquis

1 Answer

Cost to replace and repair heater core in 99 Grand Marquis


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Mar 24, 2009 | 1999 Mercury Grand Marquis

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How do I change the heater core in my 1984 grand marquis? I dont have a manual


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 .
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  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


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    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.

Feb 27, 2009 | 1984 Mercury Grand Marquis

1 Answer

2001 mercury marquis no fan for heater. climate controlsystem on


Ok you have a bad blower speed controller if you have power to the motor.
It is located under the hood in the heater housing just below the heater core coolant hoses.
You will have to drain coolant.
Remove the nuts holding the Vapor Management valve and set it aside.
Remove coolant hoses to heater core.
Disconnect electrical connector to the blower speed controller,remove screws,pull it out of heater housing.

Feb 16, 2009 | 2001 Mercury Grand Marquis

1 Answer

Heater core


It is a big job.  I had to move my dash aft several inches to access the heater core.  Lots of disassembly.  Chiltons, all data, or any manual are a big help.

Jan 02, 2009 | 1990 Mercury Grand Marquis

1 Answer

Changeing heater core in Grand Marquee 1988


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Dec 13, 2008 | 1988 Mercury Grand Marquis

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