Power Heat Control Valve

Used on all except Omni and Horizon, this valve is located between right exhaust manifold and exhaust pipe. It is a vacuum-operated device which responds to coolant controlled engine vacuum switch (CCEVS) and directs most exhaust gas flow through left exhaust manifold during cold start conditions, to help bring the mini catalyst quickly up to operating temperature. At normal temperature, engine coolant switch is open and no vacuum signal is applied to power heat control valve. Exhaust gases are evenly distributed to right and left manifolds.