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I have the same problem i have a Ford Focus 2004 MKII 1.6 TDI its had a re-gas checked fuses relay and bypassed the low pressure switch and still nothing , the compressor will run if i take the plastic cover off the relay and press the contact in on the relay via a screw driver. could the be an ECU fault or something else ?
Hello, I hope the following is of assistance.
There is a common concern with the cooling fan on this model, the cooling fan is controlled by the engine management, when the AC is switched on the cooling fan should run, if there is a fault with the cooling fan the engine management detects this and so won't allow the AC compressor to switch on.
The cooling fan usually suffers with corrosion in the fan housing, if this is the case a new fan is required.
Start with making sure the cooling fan switches on and go from there.
Let me know if I can assist further, if so let me know what other checks you have done.
The cooling fan is not turning on when you press AC button but the fan spins freely and doesn't seem corroded from looking down the engine bay is the further test i can do to to see if it is the fan that's dead