my 2003 mercury sable gs the air conditioner blows cold then hot back to cold and if I go fast it blows were the deafroster blows
not sure if ac in going out blows cold then hot back to cold and if i go over 30
it blows from the defroster
Sounds like you have a vacuum leak in the heater control system, could be a split hose, vacuum servos leaking, control switch leaking vacuum.
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