the a/c fan is under the dash, on the passengers side, the heater fan is under the hood in the center. You should hear the a/c fan from inside the cabin. Your a/c relay is funtioning properly, that's good news. I'd buy a new heater switch (small one on the console), tell them to put the dash all back together. Are they doing any other work under the dash like evap. coil etc...? Otherwise, they messed up. Your dash didn't need to come out for the heater blower problems. That is unless your car had a re-wire, ie. the two fan wirings were reversed. Ask them to test the one under the hood, remove the squirrel cage, unplug the fan, and do a direct test, brown is ground.
