Seamus Brice-Bennett wrote on Wednesday, June 04, 2008 - 07:33 pm:Ben, I've had lots of problems with my AC in the past but all seem to be sorted now. You can tell if you have the correct amount of gas in your system by looking in the sight glass when engine is running and AC is on (provided it agrees to switch on!) If you see misty clouds swirling past the sightglass your gas is low. If the glass is clear, the gas level is correct (or there isn't any gas but in that case the AC won't switch on because there's a pressure switch to stop it from doing so if gas is low - separate from the blinking light you have. When gas is low no lights will come on at all, AC is just dead. The blinking light is caused by a sensor on the compressor which detrmines that engine speed is very different from compressor speed and it stops the compressor to protect it. This lower compressor speed can be caused by a faulty magnetic clutch which is slipping, or by a compressor in difficulty possibly because the oil level in it is too low so it's in danger of seizing, or perhaps because there's too much gas in the system (this last is a guess, I don't really know). In my case the clutch was contaminated by oil from the compressor because of a faulty oil seal on the compressor shaft. I had to have a reconditioned compressor because that oil seal is a special one, and also because one of the reed valves in the compressor was broken. With luck you won't find your problem is that serious!
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Can this be an intermittent fault? 
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