Thread: W124 E420 Heater Control Valve
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  #3  
Old 12-05-2009, 06:04 PM
Ivanerrol Ivanerrol is offline
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Join Date: Jan 2008
Location: Melbourne Australia
Posts: 844
The duovalve on my 89 260e clicks every 4 - 5 seconds. I don't know if you have the same setup in your car.
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