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cleaned combi valve but the solenoid valve is hissing all the time from that little round cap on it. I don't know if that is what its supposed to do all the time or if it is stuck. All the other vacuum lines seem to be functioning fine.

Vehicle: 2000 Volkswagen jetta 2.0

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Hi there,

It should  not be hissing. This means it's leaking and needs to be replaced.

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