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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sounds like maybe your dryer is plugged up .
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.
Sounds like ?? 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.
This may be one of those where the entire dash has to come out to do the heater core.
But you only want to replace the core if it is plugged, or leaking. There is an easy way to tell if it is plugged: with the engine at normal operating temperature, and the control valve open so coolant will circulate, now feel both heater hoses. If core is blocked, only one hose will be hot. If core is circulating correctly, both hoses will be hot. If they are, you don't need to change out the core. One of your vacuum actuated doors is the problem, the blend door that lets air from the blower motor pass over and around the heater core.
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.
you have to remove the plenum case behind the dash. I will provide 94 gr marquis. don't have 84.
Section 12-03A: Air Conditioning System—Manual A/C-Heater
1994 Crown Victoria/Grand Marquis. Workshop Manual
REMOVAL AND INSTALLATION
Remove the heater air plenum chamber assembly as outlined.
Heater Air Plenum Chamber
Disconnect battery ground cable .
Disconnect the heater water hoses 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 during heater air plenum chamber removal.
Remove three nuts located below the windshield wiper motor (17508) retaining the LH end of the heater air plenum chamber to the dash panel .
Remove one nut retaining the upper LH corner of the A/C evaporator core housing to the dash panel .
Remove LH and RH lower instrument panel insulators.
Disconnect two vacuum supply hoses from vacuum source. Push grommet and vacuum supply hose into passenger compartment.
Remove all instrument panel retaining screws and pull the instrument panel back as far as possible without disconnecting any wire harnesses.
Loosen the RH door sill plate and remove the RH side cowl trim panel.
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.
Disconnect the vacuum jumper harness at the multiple vacuum connector near the heater outlet floor duct.
Disconnect the white vacuum hose from the heater and A/C air inlet duct door vacuum control motor.
Remove two hush panels.
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 .
Remove two nuts from the two studs along the lower flange of the heater air plenum chamber .
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 .
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
Screw (2 Req'd)
Heater Core Case Seal
Heater Dash Gasket
Heater Air Plenum Chamber
Heater Core Cover
Pull the heater core assembly from the heater air plenum chamber assembly.
Carefully install heater air plenum chamber assembly into the heater air plenum chamber assembly. Visually check to ensure that core seal is properly positioned.
Position the heater core cover and install the four retaining screws.
Install the heater air plenum chamber assembly as outlined.