Ford Focus Forum, Ford Focus ST Forum - View Single Post - pipe under thermostat housing?
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Old 10-08-2012, 08:26 AM  
TerryB
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That is the PCV hose. The pipe under the t-stat housing is metal. The front has an elbow to the PCV valve. The back hose goes to the intake manifold. The back one gets replaced quite often on the Zetec. They tend to collapse or tear at the elbow into the intake manifold. Here is the newer Ford replacement.
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