To ensure reliability, purchase Ford part # F3DZ-19D644-A Valve Assembly - Pressure Relief. It is sometimes referred to as Mercury HVAC Pressure Switch, Mercury A/C System Valve Core. In terms of quality and longevity, OEM parts are top-tier. This is because they are made according to Ford's demanding factory specifications and go through strict quality control. This part fits specific Mercury Mountaineer, Mystique, Sable models.
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