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Date: Sun, 02 Sep 2007 00:06:43 +0100
From: Colin Stamp <>
Subject: Re: [XP] Sporadic aircon

On Sat, 01 Sep 2007 21:39:56 GMT, still me <> wrote: >On Sat, 01 Sep 2007 21:53:39 +0100, Colin Stamp ><> wrote: > >>I'm not sure whether the pressure readings actually rule out a >>refrigeration problem or not. Could it be that low refrigerant would >>cause it, for instance? >> >>I think I need all the help I can get on this one... >> >>Cheers, >> >>Colin. > >Colin: > >I can't convert bars to psi (perhaps you can help) but 7.3 vs 7.1 is >too small of a difference to be the cause. It is interesting that it >changes but that kind of a pressure change is very small. It was that closeness that made me think the compressor might not be running. i.e. the pressure during my failure mode is nearly the same as when the system has been turned off for hours. > >Also, the readings that matter are the high side and the low side, >measured at the fittings. If you get a set of gauges and some long >hoses I think you could read this while driving. I might end-up doing that before I've sussed out what's going on... > >Have you considered a possible mixing valve issue? Maybe the A/C is >working but warm air is being sent to you? Yep. It's definitely the evaporator warming up. The system passes a self-test which includes exercising the flap-valve motors, and the windows mist-up during a failure. Cheers, Colin.

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