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the water control vale could be broken or have a broken vacuum line to the valve. If it is cable operated valve the cable could be broken or jamed. the heater core could be pluged

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โˆ™ 2004-12-01 11:29:37
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Q: What is wrong with a 1990 Mazda MX6 when no warm air blows out of heater or defrost vents?
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