Mercury Grand Marquis
Car Heaters

Why would a 1989 Mercury Grand Marquis only blow warm air on the low speed setting and not on any of the other speeds?

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2006-03-09 16:00:24
2006-03-09 16:00:24

your heater core hoses could be plugged up and not letting much hot anti-freeze into the heater core then when you try to blow alot of air through it it cools the warm air off too much and you get not so warm air. try a cooling sytem flush

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