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Old 06-01-10, 08:27 AM   #4
pimpdriver
Devon Pastie Muncher
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Join Date: Jul 2007
Location: Calne Wiltshire
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on my 100 the rotary knob pulls a steel cable, the plastic bit which attached the cable had broken.

Try finding the valve which directs hot water to the heater matrix (in the engine bay) and try opening and closing it by hand.
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