• Appearance changes for DeVille/Fleetwood included restyled taillamps and a revised front-end look, plus new interior trim.
• This year's grille had many more horizontal and vertical bars in its simple crosshatch pattern, designed to accentuate the traditional Cadillac front end look.
• "Cadillac" script returned this year to the wide upper grille bar (driver's side).
• A thin molding above the grille extended outward, over the headlamps, to wrap around each fender.
• Quad rectangular headlamps were outboard of twin vertical rectangular parking lamps.
• The crosshatch grille pattern repeated itself in either side of the license plate.
• In familiar Cadillac style.
• Front fenders held large cornering lamps with clear and amber lenses.
• Seven new two-tone body color combinations were available for DeVille (and Fleetwood Brougham), with color-coordinated accent striping.
• New brushed chrome wheel covers showed the Cadillac crest on a black background.
• Also new: seatbelt chimes, a standard AM/FM stereo radio with digital display, dome light with dual spot map lamps, and optional electrically-controlled outside mirrors.
• Interiors were upholstered in Durand knit cloth (six colors) or genuine leather.
• Standard fittings included power door locks and windows, six-way power seat, and automatic climate control.
• The standard 425 cu. in. (7.0-liter) V-8 had new EGR riser tubes.
• A fuel-injected, 195-horsepower version was optional.
• The Olds-built 350 cu. in. diesel V-8 became optional in mid-year.
• Special editions for 1979 included a Custom Phaeton Coupe and Custom Phaeton Sedan, both offering styling touches intended to remind observers of the "classic" convertibles.
• Features included brushed chrome moldings with flush-mounted opera lamps and the Cadillac crest; reduced-size quarter windows; a sporty convertible-like roof; "Phaeton" script on each rear quarter panel; wire wheel discs; accent striping; 45/55 Dual Comfort front seats with leather seating; and leather-trimmed steering wheel.
• Phaeton editions came in three color combinations: Cotillion White with dark blue roof and white leather inside; Slate Firemist with black roof and antique state gray leather upholstery; or Western Saddle Firemist with dark brown roof and antique saddle leather seating.
• Also on the option list was the DeVille d'Elegance, with new soft Venetian velour upholstery (in choice of four colors) on pillow-style 50/50 seats.
• It also had Tangier carpeting, special door pull handles, and "DeVille d'Elegance" script on the glove box and exterior.
• Coupe d'Elegance had opera lamps: sedans had three roof-mounted assist straps.
• Both bodies had side moldings and accent stripes.
• Coupe DeVille also came with a Cabriolet roof treatment, including chrome crossover roof molding, in 17 Elk Grain vinyl colors.
• A French seam surrounded the back window and a Cadillac script and crest identified the Cabriolet model.

• Wheelbase: 121.5
• Overall length: 221.2"
• Height: 54.4" (coupe); 55.3" (sedan)
• Width: 76.5"
• Front Tread: 61.7"
• Rear Tread: 60.7"
• Standard tire: GR78 x 15-B SBR wide WSW

• Transmission: Turbo Hydra-matic transmission standard on all models; column shift.
• Gear ratios: (1st) 2.48:1: (2nd) 1.48:1; (3rd) 1.00:1; (Rev) 2.07:1.
• Standard axle ratio: 2.28:1
• Hypoid rear axle
• Steering: Recirculating ball
• Front suspension: independent with ball joints and coil springs, stabilizer bar
• Rear Suspension: four-link coil springs, link stabilizer
• Brakes: front disc, rear drum
• HEI electronic ignition.
• Fuel tank: 25 gal.

• 425 cu. in. V-8 Fl engine ($783)
• 5.7-liter diesel V-8 engine later in model year ($849)
• Heavy-duty cooling system ($49)
• 80-amp alternator ($54)
• Engine block heater ($21)
• California emission equipment ($83-$150)
• California fuel economy equipment ($65)
• Limited slip differential ($70)
• High altitude pkg. ($35)
• Electronic level control ($160)
• Trailering package ($49-$103)

• DeVille Cabriolet ($384)
• DeVille Cabriolet w/Astroroof ($1522)
• DeVille Cabriolet w/sunroof ($1312)
• DeVille d'Elegance ($725)
• DeVille Custom Phaeton ($2029)

• Astroroof (w/full vinyl roof): ($998).
• Astroroof (painted): ($1163).
• Sunroof (full vinyl roof): ($798).
• Sunroof (painted roof): ($953).
• Cruise control ($137).
• Controlled-cycle wipers: ($38).
• Rear defogger, grid-type ($101).
• Six-way Dual Comfort power passenger seat adjuster ($125-$160).
• Power driver's seat recliner ($122).
• Power passenger seat recliner with six-way adjuster ($221-$280).
• Power passenger seatback recliner, bench seat: ($122).
• Tilt/telescope steering wheel ($130).
• Automatic door locks ($121).
• Illuminated entry system: ($62).
• Fuel monitor ($31).
• Theft deterrent system ($137).
• Trunk lid release and power pull-down: ($85).
• Opera lamps: ($66).
• Twilight Sentinel: ($56).
• Guidematic headlamp control ($91).
• Trumpet horn ($22).
• Remote-control right mirror: ($40).
• Electric remote left mirror w/thermometer ($90).
• Lighted thermometer on left mirror ($28).
• Lighted vanity mirror, passenger ($52).
• Electronic-tuning seek/scan AM/FM stereo radio with 8-track tape player ($195); w/8-track and CB ($480); w/cassette ($225); w/CB ($380).
• Two-tone paint, partial Firemist ($361).
• Firemist paint ($171).
• Padded vinyl root: ($225).
• Front bumper reinforcement ($9).
• Chrome accent molding: ($90-$105).
• Accent stripes: ($56).
• Door edge guards ($13-$20).
• License frame: each ($10).
• Dual comfort front seats: ($208).
• Leather seating area ($330-$350).
• Carpeted rubber front floor mats ($33-$36); rear $16).
• Trunk mat ($13).
• Turbine-vaned wheel covers ($59)
• Aluminum wheels ($350)
• Locking wire wheels: ($569-$628).
• Locking wire wheel covers ($189-$292).

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