I was using the defrost last night because the door windows and the windshield were fogging up
So I turned on the deforst and noticed something wierd
The temp selector was all the way on cold and I felt heated air come out of the dash vents closest to the door windows and the windshield'
The middle two vents were blowing cold air.
When I turned off the defrost everything was operating normal
When I have the defrost on is that the proper operation as described above?

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'85 F250 6.9L diesel 2wd XL XC LB Centurion, Gone
'95 Mercedes E 300 Diesel W124.131 with a OM606.910 and just over 200k on the clock, needs top end engine work and a transmission.
2000 S500 W220 with a 5.0L V8 gas power.