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1988 928 S4 Front Defroster Intermittent

  • 1988
  • 928 S4
Mileage: 
64 500
Heating and Ventilation
Rehoboth Beach, 
Delaware

When I slide the A/C Control Head lever all the way to the right Defroster position the Defroster sometimes comes on and stays on, sometimes comes on momentarily and quits and sometimes never comes on at all. Coming on and staying on seems to relate, again sometimes, to colder outside temperatures.  The blower works fine with all the rotary positions.  I have swapped relays but this did not seem to have any effect. Electrical problem, vacuum problem, something else? 

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