I think this will take a miracle...
For about six months, the electric power supply system has been really erratic. Having had the battery and alternator professionally tested, I'm left scratching my head. Here are the symptoms:
With only blower running:
-at idle, blower runs fine, but air won't heat up
-at 1000-2500rpm blower motor runs very slow or stops
-above 2500rpm, blower runs normally, and air heats up
With blower and defroster running:
-at idle, blower and defroster won't work together (defroster blinks)
-when 2500rpm is acheived and maintained, everything works fine
Note:
-after the car has been driven for a while and is nice and hot, the severity of these problems is minimized

Please help!