No AC high/low pressure nipples on 1996 B5 A4 AFC? - Page 2

duanevw · 03-28-2012, 01:50 PM

Quote:

Originally Posted by turbo510

Yep, just like a tire valve. Just disconnect the electrical connector, unscrew the pressure switch (17mm wrench I think). You might get a puff of freon when it comes off, but don't worry about it. My only other advice is to roll off the O-ring from the threaded fitting, because it can be damaged by the adapter. Just screw the adaptor in, it doesn't need to be very tight, and then make a jumper to bridge the two contacts of the connector to make the compressor clutch work.

Hi, where is this low pressure switch located at? I was reading this as my is a 1995 audi 90 2.8afc engine thanks
Duane, Mi. Also? Just order that kit number online or at NAPA stores? Correct?

turbo510 · 03-28-2012, 02:47 PM

I don't know about the Audi 90; mine's an A4. But you should have a low pressure switch somewhere on the larger line returning to the compressor from the firewall area.

upallnight · 05-17-2012, 05:34 PM

On the A6 C4 cars the low pressure switch is located on the passenger side underneath the plastic cowl at the base of the windshield.

Prospeeder · 05-17-2012, 05:50 PM

There designed to be filled from the high side. When using an a/c recharge and recovery machine, when filling it usually asks, fill with HI or LO side? I think you fill with the engine off from the high side. From what my old school manual shows. Engine off, Hook the can up to the high side, and put the can in hot water. the temperature difference forces the refrigerant into the system. Kind of a silly way but its in factory audi/vw manuals.

03-28-2012, 02:47 PM	#12
turbo510 AudiWorld Senior Member 2007 Volkswagen Touareg My Garage Join Date: Jun 2008 Location: Yorba Linda CA Posts: 1,443	I don't know about the Audi 90; mine's an A4. But you should have a low pressure switch somewhere on the larger line returning to the compressor from the firewall area. __________________ 1996 Audi A4 2.8 1972 Datsun 510

05-17-2012, 05:50 PM	#14
Prospeeder AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2011 Posts: 837	There designed to be filled from the high side. When using an a/c recharge and recovery machine, when filling it usually asks, fill with HI or LO side? I think you fill with the engine off from the high side. From what my old school manual shows. Engine off, Hook the can up to the high side, and put the can in hot water. the temperature difference forces the refrigerant into the system. Kind of a silly way but its in factory audi/vw manuals. __________________ 1992 Audi 100 CS Quattro 1990 Audi 200 Avant Turbo Quattro 1991 Audi 200 Turbo 1999 Audi A6 Avant

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05-17-2012, 05:34 PM	#13
upallnight AudiWorld Member Garage is empty, add now Join Date: Dec 2002 Posts: 141	On the A6 C4 cars the low pressure switch is located on the passenger side underneath the plastic cowl at the base of the windshield.