not your usual AC problem
wondering if anyone can help with this 1997 Audi A8 quattro problem.
1. AC not blowing out cold air
2. low side pressure is about 80psi when compressor is off and about 60psi when on
3. i can hear hissing in the low pressure line near the pressure sensor near the driver side hood hinge when compressor running (I think the expansion valve is just a little bit upstream from that point)
4. internal drain lines are not clogged, but no condensation when AC is turned on.
only thing i can think of is the mixer door is permanently switched to the heat setting, but I'm not sure how to test for that. and even if that were the case, wouldnt i still get condensation drainage from the condenser coils?
Thanks in advance,
1997 Deep Green A8 Quattro








