The guess is that it isn't to do with driving on wet roads and that it IS low on refrigerant because of a leak - perhaps small and unknown as of now. You are probably hearing the compressor "click" on and off or "cycle" is the correct word which it is supposed to do under certian conditions but will do it frequently when.......... refrigerant is low, it's too cold out already, cold enough in car, or perhaps the clutch that engages the compressor has a large gap which could be adjusted but it needs to have pressures taken and noted while making lots of observations.
Ok: Could be a small problem or a big one - can't know that now. You could get a diagnosis done and decide what to do from there. Do you plan on doing a repair yourself? If so, the more you know the less trouble you'll get in.
This is a guess and most symptoms arise from loss of refrigerant. THEY DO SELL BUT BE VERY WARNED about the cheap junk they sell to boost up the system to work. It can work and it's more likely to make a small problem a big one! Virtually all those quick fix items contain sealers that WILL make the real repair much more expensive later - be warned!
So what do you want to do from here? Get some equipment and check things yourself or get some pro help - we can help you either way,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/
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