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Dash Air Only "Hot" After Startup

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I have had a similar problem that ended up being a vacuum hose that would collapse sometimes and work well other times. Airflow would change from dash to defrost when the hose failed and back again if and when it decided to mess with me again. Nightmare to track down. New hose and the system is working fine. My 12 volt vacuum pump does cycle often and I believe I have a leak somewhere that I have been unable to find yet. I think more new hose may be a good idea.

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