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Air always blowing out the defrost Vent '88 300E

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Old Feb 6, 2009 | 09:48 AM
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sajohn's Avatar
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Default Air always blowing out the defrost Vent '88 300E
I have an 88 300E and no matter what setting I have the climate control on, air always come through the upper vents at the windshield.
Does anyone know if this is a vacuum problem or an electrical problem? Or is it something else?

Any input is greatly appreciated.
Thank you in advance
 
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Old Feb 6, 2009 | 07:34 PM
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Vacuum my 87 300D does it also. behind the heater controls is a vacuum piston that opens for air in other area's check if it has vacuum or is bad
 
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Old Jul 16, 2010 | 11:08 AM
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Where did you say the valve is located- I have an 84 300SD- any help will be appreciated. Windshield fogs on outside when AC is fully charged.
 
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