A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/ cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. “Mazda Air Cooling Coil Coating” is available to encapsulate the mold to reduce odors. If the product is properly applied, it can effectively reduce the musty/mildew odor for up to three years. NOTE: See parts information for Mazda Air Cooling Coil Coating and Kit part numbers.
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Crankcase emission control equipment is separated into two different systems: Positive
Crankcase Ventilation (PVC) and Crankcase Ventilation System (CCV). The systems perform
the same function, differing only in the way the exhaust gases are metered. The PVC system uses
a valve, containing spring loaded plunger, which meters the amount of crankcase vapors routed
to the combustion chamber based on manifold vacuum. The CCV system contains a metered
orifice of a calibrated size which meters the amount of crankcase vapors drawn from the engine
based on manifold vacuum.
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