When I first test drove my seond d the fans worked and the AC did not. I was told that the heater and everything else worked. When I received it the mode switch did noting at all. So I jumped the gun and rebuilt the mode switch without checking the fuses first. I replaced the fuse, and now when I turn the mode switch I can hear the fans go on, but no matter which setting the switch is on the sound of the fan does not change, and it seems to only blow in the foot wells. The temperature guage does ot seem to do anything either. I am pretty sure that the switch it self is good, but what is this plenum seal I heard about. I really would like to get the defrost working. Oh and by the way I replaced the fuel accumulator and the D starts right up perfectly anytime anywhere. My gas leak was because of a hose that went to the accumulator was lose. Tanks for all your help, and Merry Christmas. Joe P. VIN 6808 17167