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Q:

my van is a 94 and I'm haveing trouble with the heater. my ac works but the heat on 1994 Ford Aerostar

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theheater will not heat up I have changed the thermostat and flushed the radiator but still won't put out any heat the heater core is not leaking.
(1) Answer
the heater core may be clogged. check and see if both hoses are hot. if they are, then you have a blend door issue. if they are not, the heater core will have to be replaced.

Roy