not your usual AC problem

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May 27, 2013 | 06:52 AM

gorkyc

Thread Starter

Audiworld Junior Member

Joined: May 2013

Posts: 12

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not your usual AC problem

Hello,

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

May 27, 2013 | 07:34 AM

MP4.2+6.0

AudiWorld Super User

Joined: Oct 2001

Posts: 15,310

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From: SF Bay Area, CA

Wrong board

Try the D2 board for that year A8. Could also search archives there.

May 27, 2013 | 09:39 AM

Bangerla

AudiWorld Member

Joined: Jul 2008

Posts: 225

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The pressure and temp are closely related. 60 psi is 62 degrees, so the air blowing out will not be very cold. Sounds like the system is not charged properly, or is contaminated.