Shutter Valve Actuators (MX-6 2.5L & 626 2.5L)
WARNING: This page is about a different car, the 1995 Mazda MX-6 and 1995 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect vacuum hose from shutter valve actuators No. 1 and 2. See Figure . Connect vacuum pump to actuator. Apply vacuum to each actuator separately and verify shutter valve rod retracts. Ensure both shutter valves move freely. Replace actuator if necessary.