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Old 04-16-2021, 12:37 AM   #7
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Join Date: Nov 2020
Location: Brooklyn, NY

Originally Posted by 2 old for this View Post
Don’t all hvac system default to defroster when there is a problem? Like no vacuum.
My 240 defaults to just dash vents without vacuum. Not sure if this is consistent across all model years.

Unfortunately I know this from enduring a northeastern winter with a leaky vacuum hose that ran from the check valve on the intake to the vacuum reservoir behind the dash. It took me a while to figure out why only the dash vents worked, and during that time I was stuck “defrosting” my windshield by hand with a microfiber towel

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