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(h) Severe service is when the vehicle is mainly driven
under one or more of these conditions:
− In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
− In hilly or mountainous terrain.
− When doing frequent trailer towing.
− Uses such as found in taxi, police, or delivery
service.
(i) Drain, flush, and refill cooling system. This service
can be complex; you should have your retailer perform
this service. See Engine Coolant on page 5-26 for
what to use. Inspect hoses. Clean radiator, condenser,
pressure cap, and filler neck. Pressure test the
cooling system and pressure cap.
(j) A fluid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the fluid level checked. Add fluid if needed.
(k) Or every 12 months, whichever occurs first. If you
drive regularly under dusty conditions, the filter may
require replacement more often.
(l) If you drive regularly under dusty conditions, inspect
the filter at each engine oil change.
(m) Change the fluid the first time the vehicle is serviced
after 100,000 miles (166 000 km) and when the
vehicle is serviced after each subsequent 50,000 miles
(83 000 km).
(n) Severe service is when the vehicle is mainly driven
under one or more of these conditions:
− In very high temperatures — over 110°F (43°C).
− In very low temperatures — under -20°F (-29°C).
− When doing frequent trailer towing.
(p) Visually inspect belt for fraying, excessive cracks, or
obvious damage. Replace belt if necessary.
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