Bonneville V6-3800 3.8L (1991)
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If vacuum is not present, check the hose back to the engine vacuum source.
2. Check the operation of the Temperature Valve by moving the Temperature Selector rapidly back and forth several times. Listen for the valve to
strike the stop at each end of its travel. If the sound indicates that the valve is not fully closing or opening, check the mechanical linkage between
the valve and the Temperature Selector.
