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Most likely you have a vacume leak under the dash.Check for lines off or broken.They will harden and crack with excessive heat,such as in the engine compartment.

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โˆ™ 2011-09-13 01:50:23
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Q: How do you fix a 1995 Chevy Corsica that will only blow heat out of the vent and not out of the defroster?
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