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Install Rear Defroster in Non Rear Defroster Car
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Enjoy your new FACTORY installed rear window defroster!
Locate the yellow wire that runs from defrost switch through the firewall and connects to the starter relay. fig 11
Pull this and the grommet out from the firewall side after disconnection from the starter relay. fig 12
You might have a problem around the heater box.
 You may have to loosen up (not remove) all the mounting points to get the wire through.
FORD REAR DEFROSTER REPLACMENT zephyr_site068020.jpg zephyr_site068019.jpg zephyr_site068018.jpg zephyr_site068017.jpg zephyr_site068016.jpg
Find a car with really good looking a HVAC control faceplate with defrost switch.
Make sure faceplate matches the year car you will be installing into. fig 8
Remove instrument panel trim. Remove HVAC control panel.
 You might have to reach undeneath to disconnect the wiring and the vent box cable.
The plastic vent cable clip slides up to remove. fig 9
Set the control panel with the other stuff you are taking.
Remove and fish out the grey wire with yellow stripe from the defrost switch down to the drivers side kick panel. fig 10
Remove kick panel and door sill plate the wire runs along the side under the carpet to the trunk.
Check the wire diagram for more wiring info. you will need this for the install. diag 1

Find the white wire with pink stripe that runs from the defrost switch to the fuse box.
Fish out from connection near the fuse panel.
Should be a bullet connector plugged into a yellow "Y" socket. Get the Y-adapter too.
FORD REAR DEFROSTER REPLACMENT FORD REAR DEFROSTER REPLACMENT FORD REAR DEFROSTER REPLACMENT zephyr_site068012.jpg zephyr_site068011.jpg
Now take all the parts home and put them in your car!

That is just the reverse of removing them with 1 modification to the car.
Drill a hole through the firewall for the yellow wire grommet. fig 13
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Stickers
1978 Zephyr Z-7 Coupe
1978 Zephyr 4-Door Sedan
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1978 Zephyr Z-7 Coupe
1978 Zephyr 4-Door Sedan
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Holley 1946 Tune Up/Rebuild
Find Your Vacuum Diagram
VIN & Engine Decoder
Use A Vacuum Gauge
Adust Trunk Torsion Bar
Make Console Cup Holders
Make Console Gauge Mount
Fix Dash Pad
Fix Dash Radio Cutout
Install Mustang Gauge Cluster
Add Power Windows
Add Rear Defrost
Remove Z-7 Quarter Window
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1978-1983 F/Z Ellectrical & Vacuum
1978-1983 F/Z Wiring
1978-1983 F/Z Fuse Box
1978-1983 F/Z Engine Vacuum
A/C Vacuum & Flow Charts
Spark Plug Condition & Firing Order
Fuel Line Routing
Vacuum Part Name ID
Ported Vacuum Switch ID
Auto Trans Gear ID
Manual Window Regulator Sizes
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1978-1983 F/Z Ellectrical & Vacuum
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1978-1983 F/Z Fuse Box
1978-1983 F/Z Engine Vacuum
A/C Vacuum & Flow Charts
Spark Plug Condition & Firing Order
Fuel Line Routing
Vacuum Part Name ID
Ported Vacuum Switch ID
Auto Trans Gear ID
Manual Window Regulator Sizes
Manuals & Diagrams
Holley 1946 Tune Up/Rebuild
Find Your Vacuum Diagram
VIN & Engine Decoder
Use A Vacuum Gauge
Adust Trunk Torsion Bar
Make Console Cup Holders
Make Console Gauge Mount
Fix Dash Pad
Fix Dash Radio Cutout
Install Mustang Gauge Cluster
Add Power Windows
Add Rear Defrost
Remove Z-7 Quarter Window
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Index
1978-1983 F/Z Parts Sheets
Replica Motorcraft Battery
Repro 6cyl Engine Markings
Repro Ford Litter Bag
Repro Gas Tank Sticker
Repro Visor Sleeve
Lamp Replacement Guide
Weatherstrip Measuremnts
1978-1983 Ford Paint Chips
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1978-1983 F/Z Parts Sheets
Replica Motorcraft Battery
Repro 6cyl Engine Markings
Repro Ford Litter Bag
Repro Gas Tank Sticker
Repro Visor Sleeve
Lamp Replacement Guide
Weatherstrip Measuremnts
1978-1983 Ford Paint Chips
Restoration Reproduction