Hot Idle Compensation System: Description

The Hot Idle Compensation System supplies additional air to intake manifold under hot idle conditions. This additional air is used to maintain smooth idle and reduce emissions. A bi-metallic valve in air cleaner opens passage from air cleaner to intake manifold. This allows fresh air to mix with rich air/fuel mixture (caused by sustained idle), resulting in better combustion. Valve opens between 145-160°F (63-71°C).

B2000 models utilize a 3-way solenoid valve in passage between air cleaner and intake manifold. This solenoid is energized by an A/C switch whenever A/C unit is operating.