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Old 07-11-2020, 08:41 AM   #6
Mike C
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,440
Re: Opening under dash

It's just an additional vent and clearly you are getting heat polution in your duct system from somewhere else. If it is blowing 40 out of there then that is the temp your ac is cooling to. You need to check flapper doors, heater shut off valve, etc. and you should be able to get 40 degree air from all the vents.
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