1969 Cadillac - GM Heritage Center

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During cool weather, warm air is directed into the
rear compartment of 75 models through the grilles
located beneath each rear door armrest. During
warm weather, cool dehumidified air is directed
into the rear compartment through the grilles located
overhead. There are a number of small openings
that diffuse the cool air evenly, in addition, a
hinged door that is integral with the grille may be
opened to direct air toward the rear passengers.
Floor Insulation
Scientific Soundproofing
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Four layers of selected materials protect the front
compartment against heat, cold, noise and drafts,
thus contributing to driver and passenger comfort.
Two layers of jute and a layer of carpeting are used
in the rear compartment. The four layers used in the
front compartment are:
Carpeting
Jute
Rubber Compound
Jute . . ..
The quietness of Cadillac interiors, long a matter of
notable pride for Cadillac owners, is achieved
through the Cadillac engineers' constant efforts to
design-out any engine or chassis vibrations. However,
the noise of thrown gravel and other vehicle's
horns cannot be engineered out. Therefore, selected
soundproofing is used at designated places. Added
quietness is assured by insulation in rear quarter
panels to reduce tire noise. A rubber compound
sound-barrier is also used at each side of the cowl.
Under-the-hood insulation includes 1%" of fiberglass
and a one-piece sound-barrier between engine
and passenger compartment. A layer of felt deadener
and a layer of tuflex insulation is used between the
steel top and headlining of Calais, De Vilie, Eldorado,
Sixty Special and Brougham models. Soft, durable
rubber seals for door, window and trunk are used to
insulate against damaging moisture and dust as
well as to minimize wind noise.
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