Question about 2004 Chevrolet Astro

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Heating and a/c vents do not open. fan is working.

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Had same problem vacuum hose is the problem goes from manifold to vacuum bottle located passenger side wheel well and back to t fitting on fire wall replace all the hoses

Posted on Aug 30, 2008

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Posted on Jan 02, 2017

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My windows are not defrosting properly.


Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
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could be the vent door actuator not opening all the way . under the dash there is the blend door actuator and the vent actuator that are controlled by vacuum

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There is no heat the fan works fine how do i fix it?


This sounds like the blend door actuator. This is a little door in the vent box down under the passenger side dash that opens and closes to change the vent temperature from heat to a/c. It is a little motor that opens the door. It tends to stop working due to the elements that it is in. I hope this helps!! Thanks!!

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Hope I was avle to help, glad you up and going.

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I would check if your vent to the outside is open. If it is I would check the vacum hose that controls the vent to open and close.

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