Can anyone help.

I have a VP Calais and am having problems with the air conditioner, when the air cond is on and as I am driving the car the compressor continually cuts in and out, it doesn't stay on long enough to cool down, I have had it to air cond experts, Holden service agents and they all say the same thing, they reckon it's a problem with the climate control module, all the pressures are to spec, plenty of gas, not over or under charged. I fitted another climate control module and it does exactly the same thing, so for summer I ran a seperate switch to the fan and compressor and it works fine, but I would like to have it working through the climate control module.

I would appreciate any feedback if someone has had a similar problem and how it was overcome.