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Feel of the hoses at the heater core. If one is hot and the other is cold the heater cont balbe is not working. If they are both hot, the mixing door inside is not operating. Make sure you have vacuum going into the cab from the intake.

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โˆ™ 2014-02-14 13:12:19
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Q: What could cause a 1990 Ford Aerostar not to get heat?
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