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I have a 1992 Ford Aerostar Van that blows luke warm air up front and cold air in the rear. I replaced the thermostat and both heater cores with no improvement. Any suggestions?

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The thermostat is done it has to be replaced.......

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The Ford Aerostar is a van that was produced from 1986 to 1997 by the Ford Motor Company. They produced 2,029,577 Aerostar vans in that time. This model was replaced by the Ford Windstar.

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Can not be repaired, only replaced with the thermostat housing as one unit.

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You don't. You replace a thermostat that has failed. They are meant to be replaced.

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If the thermostat has failed it will need replaced.

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Check into the temperature control valve--this is different than the thermostat.

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I had mine replaced and the cost of the thermostat and housing was $48.67 without the cost of labor.

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It's complicated to answer that question.

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Check the control actuating cables or switch to the heater diverter valve to make sure hot water is being sent to the core.

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