The hi speed only problem is probably the resistor like Maroon said. It should be located in the duct that brings in outside air into the heater core. They usually put it there for cooling. It may be under the dash in the ductwork. Usually held in by two screws.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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