Power Heat Control Valve

Located between right exhaust manifold and exhaust pipe, valve is vacuum operated which directs majority of exhaust gas flow through left exhaust manifold. An electrical solenoid controls manifold vacuum signal necessary to activate heat control valve.

At coolant temperatures below a predetermined level, manifold vacuum is applied to heat valve and all exhaust gas flow is directed to left exhaust manifold. Above this temperature, no vacuum signal is applied to heat valve and exhaust gas flow exits both right and left exhaust manifolds.