1993 no air or sometime
 

My 1993 started to act up with the blowing of air through the vents. Have owned it for two years and from the get go it would take it a few minutes for the air to come out of the selected vents. It has the electronic climate control system . Now it will blow through the selected air vents as before, but it wil quit blowing air through any of the vents. The blower motor is working fine during all of this. If i stop and wait about five minutes and come back out and start it it will work fine . Any ideas ?