BenzWorld Junior Member
Date registered: Aug 2004
Mentioned: 0 Post(s)
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Bad climate control switch or bad vacuum switchover valve
When my 84 190D is running I can hear a clicking sound coming from my vacuum switchover valve that is behind the pass. vent. The clicking sound will go on for some time. the clicking is not when I am switching the climate control switch. It does it on it's own. It will click for a few seconds then stop then it will come back. If anyone has any ideas please respond.