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It sounds like u need to replace the thermostat. At slower speeds the air flow through the radiator is minimal, but at higher speeds the air cools the radiator more. This only happens if the thermostat is not keeping the water in the engine block long enough.

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โˆ™ 2005-01-06 21:24:37
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Q: Why would the heat and temperature gauge in a 1995 Plymouth Voyager drop at higher speeds?
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