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280 Car care
Anti-corrosion
treatment
The entire car undergoes a series of anti-
corrosion processes during production.
These include electrophoretic priming,
PVC-based coating to protect against stone
chip damage and corrosion, and treatment
of body cavities and members with thin,
penetrating rustproofing oil.
In addition, most body panels, such as the
hood, doors and floor pan are galvanized.
The anti-corrosion treatment on some parts
of the car is constantly exposed to wear and
prone to damage. This applies particularly
to the underside of the car and inside the
wheel arches, where grit, road salt and the
like that are thrown up can give rise to cor-
rosion where the underseal has worn away.
The extent of this obviously depends on the
conditions in which the car is used.
Accordingly, make it a habit to hose the
underside of the car often and to inspect the
condition of the underseal. The anti-corro-
sion warranty does not relieve the car owner
of the need to carry out normal maintenance
to the rustproofing and to make good any
damage.
Use a hose to clean the underside of the car
thoroughly. After it has dried, use a brush or
spray to apply a viscous anti-corrosion
agent to any worn or damaged areas, to
prevent the onset of corrosion.
Even after the anti-corrosion warranty has
expired, it makes good sense to continue to
maintain the rustproofing.
Seams in the body, especially those in the
doors and trunk lid, are particularly vulnera-
ble to corrosion from the outside, caused by
grit and salt thrown up from the road, and to
corrosion from the inside, largely as a result
of condensation. Keep the seams clean and
at the first sign of any rust, apply a thin, pen-
etrating, anti-corrosion oil. Your Saab
dealer will be pleased to give you further
advice.
What causes rust?
Steel body panels of automobiles are sub-
ject to rusting whenever air and moisture
manage to penetrate the protective finish.
Body panels may rust through if the process
is unchecked. Rusting can occur wherever
water is trapped or where the car’s panels
are continuously damp.
Damage to paint and undercoating by
stones, gravel and minor crashes immedi-
ately exposes metal to air and moisture.
Road salts used for de-icing will collect on
the bottom of the car and promote rusting.
Areas of the country with high humidity have
a greater potential for rust problems, espe-
cially where salt is used on roads or there is
moist sea air. Industrial pollution (fallout)
may also damage paint and promote rust-
ing.
93U SM 06.book Page 280 Friday, February 18, 2005 1:15 PM