When I turn either the Heat or the A/C on, they work for about 30 minutes then gradually fade away. I can still hear the blower. it's still working but not blowing anything into the cabin. When I turn the A/C or heater control to OFF and wait about 30 to 45 minutes to turn them on again they will work, for about 30 min. Any ideas where to start looking?
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I suspect that the full engagement of the clutch pressure plate is not being achieved
if a pressure plate is held at reduced application pressure , it will continuously slip marginally and this build up to a point where the clutch plate will not absorb any more heat and so it fades and slips completely ( same affect as brake fade from worn pads and too heavy brake application -like long down hill runs )
the area I would check is the clutch master cylinder as it appears that the compensating port is blocked , and holding pressure in the clutch line which with increasing heat from the clutch builds up more pressure and compounds the pressure plate problem
this is identical to a heavy truck clutch problem where full testing produced no problems , yet at 100 miles and on a range the clutch failed completely but when cooled down again tested as good
on replacing the clutch pressure plate and clutch plate it was revealed by a clutch specialist shop that the pressure springs were actually weaker that specifications and were in fact allowing the clutch top slip and so go into the fade situation
It may be the speed volume is enabled on your radio, does it fade out when you start to come to a stop? Some vehicles have a speed volume setting in their radios in which the radio raises and lowers the volume during driving conditions, like when your comming to a stop, the volume will automatically lower and during faster driving speeds will rise to a higher volume.