Thermactor Controls

Direct the flow of air from air pump to either the exhaust manifold, catalytic converter, or atmosphere. Solenoid valves control vacuum flow which operates a Thermactor Air Valve assembly. These valves are called the Thermactor Air By-Pass (TAB) and Thermactor Air Diverter (TAD) valves.

In normal operation, the air is injected into the catalytic converter to reduce emissions. When the engine is idling or decelerating for long periods of time, air is diverted to atmosphere. When the engine is cold, air is injected into the exhaust manifold to help heat exhaust gases before they reach the converter.