High idle problems can
be caused by the cold-start thermowax or the corresponding coolant passages for
the thermowax. The high idle is usually a very consistent 1,200RPM to
Clogged coolant passages prevent proper functioning of the
thermowax by preventing proper coolant flow. The thermowax doesn't melt,
and the throttle plates are stuck in the high-idle position. These coolant
passages from from the back of the water pump housing to the BAC valve to the
throttle body and eventually end going down the top of the rear rotor side housing.
If the thermowax itself failed, you'll need to replace the unit.
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