Information needed to help , did hi fan work after dealer visit ? Or is this something new that you noticed after that visit because the weather turned warmer ?
Sometimes when going into TIPM there may be codes that don't showup on the dash .
Stored codes sometimes won't allow certain functions to operate .
Sometimes something as simple as disconnecting the battery completely and shorting the two leads together will clear some stored codes .
Tell us more , maybe Ron will chime in here , he is a wealth of knowledge when it comes to issues like this .