How to turn on the heater

Just turn the temp knob all the way to the right. It should be in the red. It will blow out of whichever vent you have it set to on the far right knob. The A/C button will not change whether not not heat blows out unless you have it set to MAX A/C, in which case you will have cold air no matter what. If you have it set to heat with max a/c turned off, you may have an issue with the HVAC system blend door. This blend door is inside the duct, and when you change the air temperature it opens or closes to allow different temperature air to come through the vents. If this is the case, it can be a bear to get to, so I would advise taking it to one of the certified shops in your area for a proper diagnosis. Ft. Polk gets cold, I know. http://repairpal.com/chrysler-within-10-miles-of-leesville-louisiana-71446

If you have the temperature controls (three knobs in center section) turn the center knob to the right for heat. If you have the automatic temperature controls (four knobs in the center section) turn one or both of the center knobs to the higher temperature numbers for heat. This is also in your owners manual under "Instrument Panel". If you've lost it, search Google for "2008 Chrysler 300 Owners Manual" and you'll be able to find a free download!