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I don't think that this problem is unique for a vehicle of it's age. You probably either have some blockage in the heater core or your coolant system has a bad thermostat or the coolant system has a significant air pocket (that needs to be bled out.) The cheapest thing is to try and bleed the system, then replace the thermostat, then flush the coolant system. In a rarer situation you may have a vacuum leak that effects the valve controlling the circulation of water into the heater core. None of these are expensive but are time consuming.
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1999 expedition air condition diagram?
wear is the door that turns cold / to hot my ac is blowing heat it is chard but the flapper door is not holding open do know wear to look
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i think that it is determined by the position of the sun. cheers-rhys stannard 10DL
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Replace Thermostat
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when turning on air conditionor for cold air only get hot
