Check Fuses
The 2008 Ford F150 doesn't have a vent window. They do come with a Vent visor so that you can roll your window down a little bit without being in the elements, a replacement will cost you about $50.
To close the rear vent windows on a 2000 Ford Windstar, locate the window control switches on the rear door panel. Press the switch down to close the vent windows, making sure to hold it until the windows are fully closed. If the windows are not responding, check for any obstructions or issues with the window regulators. If problems persist, it may be necessary to consult a mechanic for further assistance.
On a 2004 Ford Expedition : In the overhead console there is a button marked " VENT " ( that is used to open and close the power rear side windows )
Use the VENT control buttons in the overhead console
Switch on the center dashboard that says 'vent'.
Trouble code P1451 means: Evaporative Emission System Vent Control Circuit
I was looking at the 2004 Ford Freestar Owner Guide and it shows that the SINGLE switch for the power vent windows is located on the dash ( but not where on the dash , not much help ! ) The switch has " VENT " on it
I believe 1967 for Chevy cars and 1972 for Chevy trucks.
To open the vent windows on a 2012 Dodge Caravan, locate the window control switch on the driver's side door panel. Press the switch upward to open the vent windows. If you have a manual model, you may need to use the window crank to adjust the vent windows. Ensure the vehicle is in a safe position before adjusting the windows.
There is a very small leak in the heater core that is collecting in the vent system and is evaporating out when you turn the heater on. The smell is from the antifreeze in the water.
1998 Chevrolet Blazer did not have vent windows.