Have a 2012 Ram 1500 Laramie Longhorn with a little over 113,000 miles on it... While driving today I tried to turn off the air conditioner while taking a service call (otherwise I wouldn't be able to hear anything over the blower motor) It looked like it powered off on thermostat display but was still blowing full force. Tried it again & then restarted truck & now it still sounds like it's blowing full force but there's barely any air coming from the vents. What could be preventing it from turning off? How do I fix it?