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Avoid Low Coolant Temperature Operation
Continual operation at low coolant temperature below
the normal range on the gauge (140°F/60°C) can be
harmful to the engine. Low coolant temperature can
cause incomplete combustion which allows carbon and
varnish to form on piston rings and injector nozzles.
Also, the unburned fuel can enter the crankcase, diluting
the lubricating oil and causing rapid wear to the engine.
Cooling System Tips — Automatic Transmission
To reduce potential for engine and transmission over-
heating in high ambient temperature conditions, take the
following actions:
•
City Driving —
when stopped, put transmission in neutral and increase
engine idle speed.
•
Highway Driving —
reduce your speed.
•
Up Steep Hills —
select a lower transmission gear, but try and keep the
torque converter locked.
•
Air Conditioning —
turn it off temporarily.
Do Not Operate The Engine With Low Oil
Pressure
When the engine is at normal operating temperature, the
minimum oil pressures required are:
Idle 700 to 800 RPM...............10psi(69kPa)
Full speed and load ..............30psi(207 kPa)
266 STARTING AND OPERATING