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On the passenger side under the hood on the fire wall there is a vacuum hose along with a one way check ball valve, the vacuum line always brakes or cracks which will cause the air to only blow on defrost or blow from vents until you give it more gas or climb a hill. Find the broken vacuum line and repair it, that will fix the problem, if it doesn't you may have a check ball valve on that vacuum line that has gone bad.
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∙ 14y ago
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