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Bad climate control switch or bad vacuum switchover valve

2K views 0 replies 1 participant last post by  jwht 
#1 ·
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.
 
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