why does the heater on my 93 ford taurus only work when im going 45mph or faster?

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mouse

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i have a 93' ford taurus and the heater only works when im going 45mph or faster.it has a new thermostat,what eles could it be?
 
If you have a new thermostadt..and there is no leak in the heater core...If your coolant/water ratio (too much coolant) is not correct it can affect wether or not the heater works properly. If you changed out the thermostadt then possibley there might be too much coolant.

Might also check the heater switch.
 
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