So, Its normal to be unable to get outside temperature air through the vents?

 

Sorry, I was referring to the OP. If yours is staying on constant that is a problem. And I would say maybe trying a switch from a junk yard to save some cash on troubleshooting.

 

In my 95 1500, the a/c condenser runs with the mode selector in any a/c mode and both defrost/defrost-floor. Which I'm being told is normal. Although now it is cold, If I have my defrosters on for more than 10min or so, the heat stops blowing. I have to turn the selector to floor or vent and wait about 10-15min for it to start blowing. I have changed. 1.Blower Motor and components. 2. ALL Vacuum lines and canister. 3. All switches related to heat and A/C. This was not cheap and it is still doing this. My only theory is that the lines running to the firewall for the a/c (not sure the correct term) are freezing and causing vacuum loss somehow. I was also told by a Dodge Tech that the heat should return to it's default setting (defrost) is this should happen. But it is not. I am running out of things to throw across the garage!!! Some one have a common problem or Fix???