Buick 1993 Century Owner's Manual page 287

ITEM
NO. SERVICE
5 Engine Accessory Drive Belt Inspection-
*
Inspect the belt for cracks, fraying, wear and
proper tension. Replace as needed.
6 Cooling System Service*-Drain, flush and
refill the system with new or approved recycled
coolant conforming to GM Specification 1825M.
Keep coolant at the proper mixture as specified.
See "Engine Coolant" in the Index. This
provides proper freeze protection, corrosion
inhibitor level and engine operating temperature.
Inspect hoses and replace if they are cracked,
swollen or deteriorated. Tighten screw-type hose
clamps. Clean the outside of the radiator and air
conditioning condenser. Wash the pressure cap
and neck.
To help ensure proper operation, we recommend
a pressure test of both the cooling system and the
pressure cap.
ITEM
NO. SERVICE
7 Transaxle Service-Change both the fluid and
filter every
l5,O00
miles (25 O00
km)
if the
vehicle is mainly driven under one or more of
these conditions:
In heavy city traffic where the outside tem-
perature regularly reaches 90°F (32OC) or
higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in
taxi,
police car or
If you do'not use your vehicle under any of
these conditions, change both the fluid and filter
every 100,000 miles (160 0o0 km).
plugs with the proper type. See "Specifications
'and Capacities" in the Index.
delivery service.
8 Spark Plug Replacement*-Replace spark
285