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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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
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.

Feb 20, 2015 | 2004 Chevrolet TrailBlazer

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1998 dodge durango heat works fine just barely any air blows out vents Fan seems to run fine and at all speeds


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

Feb 26, 2014 | Cars & Trucks

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We have a 2005 Grang prix and the heater will not but out much heat. We checked the coolent and it is full


Open the hood and with the heater running(be careful PLEASE), feel the lines going to the heater core(2 hoses running to the firewall, to the blower motor). Is one of them hot? If both are cool, your relay valve to allow coolant to the heater core is stuck. It will have to be replaced. Is the blower fan running( that's the fan in front of the firewall)? If the valve opens but no fan running, you will not get hardly any heat. If all that is working, You have a problem with the vent control valve(that will open the hose duct to allow heat to go through the vents). It works off of vacuum. A hose may have broken (they are made of rubber), or it may be just stuck. Check these first, before looking at the heater core. I hope this helps you

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1 Answer

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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No air or heat blowing from vents


if the fan is blowing this could be a problem with the climate controll switch that changes the direction of air from floor to defrost to vents, some are vacuum controlled through a vacuum operated mechanism that opens and closes a door in the vents which redirects the air to different places.

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1 Answer

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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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1 Answer

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