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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Stuck on defrost

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Old 11-29-2010, 11:24 PM
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Default Stuck on defrost
My car heater just decided to stick on defrost. The **** moves, the fan works but the air only comes out the defrost. Any ideas?
Last edited by 1bad72; 11-30-2010 at 09:21 PM.
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Old 11-30-2010, 01:13 AM
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Have you checked to make sure your getting vacuum to the controls.

try this link http://shbox.com/1/vac_check_valve.jpg
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Old 11-30-2010, 09:20 PM
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I have notchecked that but I definitly will. Thank you for the pic.!
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