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Several possibilities, (I am assuming there is air actually blowing, but it is cold), your not getting circulation through the heater core, coolant level is too low. i had the same prob my front defrost would not work what i found is that it was a small plastic tube that runs the side of the motor that is connected to the vacume. those plastic tubes get very brittle and break easy, once i fixed that tube my defrost worked

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โˆ™ 2005-09-15 13:49:13
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Q: What would cause no heat or defrost in a 1995 Olds Achieva?
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