My 2001 Chrysler Town and Country heater is working fine on the driver side, but blows out cold air on the passenger side. Help

I have seen this quite a bit. This issue is caused by the blend door for the climate control system. Those doors were not that well constructed and end up breaking to the point where the climate system can no longer operate the door. This can be a very difficult to repair because it requires dash removal to get access to the appropriate door. This condition can easily be verified by a dealer test with scan tool. If you would like to replace yourself I would recommend contacting dealer for a copy of the removal and repalcement procedure for the passengers blend door. I hope this information was helpful.