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CCU getting unresponsive.... I want to bypass part of it! 700 1988

posted by  fixit2003 on  Wed Aug 24 02:31 CST 2005
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On my '89 740 there's a rather large vacuum line that goes up to a resevoir in the front of the car. With the engine off I can move the vent control lever and hear a faint hissing sound as the vacuum reserve operates the heater/ac/vent valves. Does yours do the same? If not the resevoir may be cracked and leaking.






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