Cooling System Specifications Ford Tempo I

THERMOSTAT

Most thermostats are thermal wax pellet type. As coolant temperatures rise the wax begins to expand. This expansion over comes spring tension allowing the thermostat to open. Some thermostats also incorporate an additional bleed hole to allow a small amount of circulation and helps eliminate air locks.

PRESSURE CAP

Modern cooling systems use a closed system type cap. This system allows for coolant expansion during engine operation. As coolant expands and builds pressure, some coolant is permitted to bleed past the cap into the over flow tank. When the engine cools and coolant contracts, the cap allows the coolant in the over flow tank to siphon back into the system.

The pressure cap also increases pressure in the cooling system. The increased pressure raises the boiling point, one pound of pressure raises the boiling point approximately 10° F (12.2° C).

COOLANT MIXTURE

Engine coolant must be mixed with water to a specific percent. A 100% coolant mixture could cause system over heating or premature system failure. Coolants are designed to function best when mixed with water. The percentage of coolant to water can vary depending on climate condition, but a 50/50 mixture is a standard percentage.

Engine coolant should also include an aluminum protection additive. This will help protect against metal deterioration.

MAINTENANCE

Periodic maintenance is necessary for extended cooling system and engine life. Because engine and cooling systems are made of different metals, electrolysis begins to destroy the metals. Changing the coolant at scheduled maintenance periods reduces electrolysis and removes sediment. See COOLANT REPLACEMENT SCHEDULE in this article.

Note. Approximate capacity figures are shown. Capacities may vary 15% due to system variations.

COOLING SYSTEM SPECIFICATION

COOLANT REPLACEMENT SCHEDULE

See also:
• COOLANT REPLACEMENT SCHEDULE