Hello,
I have Audi A6 from 2006. When I rev the engine past 2000 rpm the AC stops working. If I rev the engine again I hear a hissing sound and the AC starts working normally. I made a video with live data. As you can see from it, the gas pressure drops immediately after I rev the engine and the evaporator temperature rises rapidly. Any ideas what is causing the issue.
https://www.youtube.com/watch?time_cont ... mzufjhHgRM
AC stops working when I rev the engine (live data video)
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zafirovp
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Re: AC stops working when I rev the engine (live data video)
Nice computerized thingee, but I want to go back to basics. Is the compressor clutch actually engaged over 2000 rpm, take a look. And if not engaged, is that AC clutch getting 12 volts positive?zafirovp wrote:Hello,
I have Audi A6 from 2006. When I rev the engine past 2000 rpm the AC stops working. If I rev the engine again I hear a hissing sound and the AC starts working normally. I made a video with live data. As you can see from it, the gas pressure drops immediately after I rev the engine and the evaporator temperature rises rapidly. Any ideas what is causing the issue.
Re: AC stops working when I rev the engine (live data video)
As far as I know this is clutchless ac compressor. The only thing that is engaging is the AC regulating valve n280.
Re: AC stops working when I rev the engine (live data video)
This compressor has a clutch hub. Just hidden.
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Re: AC stops working when I rev the engine (live data video)
No RPM readings in the video, so it is hard to determine what is going on there.
The regulating valve never moves and a pressure sensor shows what may be the high side going all over the place.
Without actual system pressure from both the low & high side & an RPM reference it is all guesswork.
Since you have three different vent temperature sensors, I would wonder about a control system issue / sensor failure.
When you increase engine speed, the compressor capacity increases. the high side pressure should increase, the low side should drop - and the control valve should shift compressor capacity to manage things. You appear to have a swing of over 120 psi on the high side with no change in control valve setting.
Sounds like you may need a dealer level scanner.
The regulating valve never moves and a pressure sensor shows what may be the high side going all over the place.
Without actual system pressure from both the low & high side & an RPM reference it is all guesswork.
Since you have three different vent temperature sensors, I would wonder about a control system issue / sensor failure.
When you increase engine speed, the compressor capacity increases. the high side pressure should increase, the low side should drop - and the control valve should shift compressor capacity to manage things. You appear to have a swing of over 120 psi on the high side with no change in control valve setting.
Sounds like you may need a dealer level scanner.