Cooling System Specifications Dodge Shadow I

THERMOSTAT

Most thermostats are thermal wax pellet type. As coolant temperatures increase, the wax begins to expand. This expansion overcomes spring tension, allowing thermostat to open. Some thermostats also incorporate an additional bleed hole to allow a small amount of circulation to aid in eliminating 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 overflow tank. When the engine cools and coolant contracts, the cap allows coolant in the overflow 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.

Note. The Monaco and Premier do not use a radiator cap. These models only use a pressure cap on the coolant pressure bottle.

COOLANT MIXTURE

Engine coolant must be mixed with water to a specified percentage. A 100 percent coolant mixture could cause system overheating or premature system failure. The percentage of coolant to water can vary depending on climate condition, but a 50/50 mixture is a standard percentage.

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 coolant at scheduled maintenance periods reduces electrolysis and removes sediment. See COOLANT MAINTENANCE INTERVALS table.

COOLANT MAINTENANCE INTERVALS

Note. Approximate capacity figures are shown. Capacities may vary slightly.

COOLING SYSTEM SPECIFICATIONS

See also:
• COOLANT MAINTENANCE INTERVALS