Heat and A/C not Working on 1991 GMC Vandura 2500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The heater and A/C does not work at all. When we were using the A/C it was only working up front - the rear would not work at all. Now that it's freezing outside, the heater stopped working as well. When you turn it on, you can hear it running, but it will not blow out of the vents front or rear. If you let the heat run for a while (about 30 mins) it will start blowing out of the front vents, but it is cold air. Have constantly checked fluid levels and all are fine, van was just tuned up in September and supposed to have been checked out for any issues which obviously the mechanic hired ripped us off with.
(0) Answers