I redid my interior last summer and had alot to do with the heater box. for months now my HVAC doesn't come on - we'll just say - until it feels like it. originally it seemed to be temperaturerelated - the coleder i is out, the longer it took to come on. Anymore, it sees to come on once warmer outwide but that's random, and then if I either turn on the AC or turn blower to high, either of 2 things happen. the blower may drop out briefly but come back on after several seconds, o the whole system goes out. give that a ouple minutes and system comes back on. I've checked every fuse and relay I can find for it (even using the shop manual). Does anyone have any idea whats going on here. Several point out checking the ground but nothing tells me where where exactly that ground is. The system 'amplifier' was also replaced and my ECM has been checked out. I need help, thanks 1993 z32, coupe, na